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Subset	tabledap	Make A Graph	Title	Summary	FGDC	ISO 19115	Info	Background Info	RSS	Email	Institution	Dataset ID
https://erddap.maracoos.org/erddap/tabledap/cbp_agg.subset	https://erddap.maracoos.org/erddap/tabledap/cbp_agg	https://erddap.maracoos.org/erddap/tabledap/cbp_agg.graph	CBP Water Quality Monitoring Subset (1984-2018)	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/cbp_agg_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/cbp_agg_iso19115.xml	https://erddap.maracoos.org/erddap/info/cbp_agg/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/cbp_agg.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=cbp_agg&showErrors=false&email=	Penn State	cbp_agg
https://erddap.maracoos.org/erddap/tabledap/CBP_CB1_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB1_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB1_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB1 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB1_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB1_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB1_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB1_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB1_1&showErrors=false&email=	Penn State	CBP_CB1_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB2 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB2_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB2_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB2_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB2_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB2_1&showErrors=false&email=	Penn State	CBP_CB2_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_2	https://erddap.maracoos.org/erddap/tabledap/CBP_CB2_2.graph	CBP Water Quality Monitoring Subset (1984-2018), CB2 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB2_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB2_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB2_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB2_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB2_2&showErrors=false&email=	Penn State	CBP_CB2_2
https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB3 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB3_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB3_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB3_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB3_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB3_1&showErrors=false&email=	Penn State	CBP_CB3_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_2	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_2.graph	CBP Water Quality Monitoring Subset (1984-2018), CB3 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB3_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB3_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB3_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB3_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB3_2&showErrors=false&email=	Penn State	CBP_CB3_2
https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3C.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3C	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3C.graph	CBP Water Quality Monitoring Subset (1984-2018), CB3 3C	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB3_3C_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB3_3C_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB3_3C/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB3_3C.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB3_3C&showErrors=false&email=	Penn State	CBP_CB3_3C
https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB3 3E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB3_3E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB3_3E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB3_3E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB3_3E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB3_3E&showErrors=false&email=	Penn State	CBP_CB3_3E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB3_3W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB3 3W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB3_3W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB3_3W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB3_3W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB3_3W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB3_3W&showErrors=false&email=	Penn State	CBP_CB3_3W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1C.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1C	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1C.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 1C	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_1C_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_1C_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_1C/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_1C.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_1C&showErrors=false&email=	Penn State	CBP_CB4_1C
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 1E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_1E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_1E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_1E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_1E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_1E&showErrors=false&email=	Penn State	CBP_CB4_1E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_1W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 1W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_1W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_1W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_1W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_1W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_1W&showErrors=false&email=	Penn State	CBP_CB4_1W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2C.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2C	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2C.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 2C	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_2C_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_2C_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_2C/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_2C.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_2C&showErrors=false&email=	Penn State	CBP_CB4_2C
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 2E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_2E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_2E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_2E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_2E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_2E&showErrors=false&email=	Penn State	CBP_CB4_2E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_2W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 2W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_2W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_2W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_2W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_2W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_2W&showErrors=false&email=	Penn State	CBP_CB4_2W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3C.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3C	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3C.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 3C	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_3C_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_3C_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_3C/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_3C.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_3C&showErrors=false&email=	Penn State	CBP_CB4_3C
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 3E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_3E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_3E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_3E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_3E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_3E&showErrors=false&email=	Penn State	CBP_CB4_3E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_3W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 3W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_3W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_3W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_3W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_3W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_3W&showErrors=false&email=	Penn State	CBP_CB4_3W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_4	https://erddap.maracoos.org/erddap/tabledap/CBP_CB4_4.graph	CBP Water Quality Monitoring Subset (1984-2018), CB4 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB4_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB4_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB4_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB4_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB4_4&showErrors=false&email=	Penn State	CBP_CB4_4
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_1&showErrors=false&email=	Penn State	CBP_CB5_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_1W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 1W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_1W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_1W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_1W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_1W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_1W&showErrors=false&email=	Penn State	CBP_CB5_1W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_2	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_2.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_2&showErrors=false&email=	Penn State	CBP_CB5_2
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_3	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_3.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_3&showErrors=false&email=	Penn State	CBP_CB5_3
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_4&showErrors=false&email=	Penn State	CBP_CB5_4
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4W.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4W	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_4W.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 4W	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_4W_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_4W_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_4W/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_4W.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_4W&showErrors=false&email=	Penn State	CBP_CB5_4W
https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_5.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_5	https://erddap.maracoos.org/erddap/tabledap/CBP_CB5_5.graph	CBP Water Quality Monitoring Subset (1984-2018), CB5 5	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB5_5_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB5_5_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB5_5/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB5_5.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB5_5&showErrors=false&email=	Penn State	CBP_CB5_5
https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB6 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB6_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB6_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB6_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB6_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB6_1&showErrors=false&email=	Penn State	CBP_CB6_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_2	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_2.graph	CBP Water Quality Monitoring Subset (1984-2018), CB6 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB6_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB6_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB6_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB6_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB6_2&showErrors=false&email=	Penn State	CBP_CB6_2
https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_3	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_3.graph	CBP Water Quality Monitoring Subset (1984-2018), CB6 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB6_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB6_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB6_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB6_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB6_3&showErrors=false&email=	Penn State	CBP_CB6_3
https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_4	https://erddap.maracoos.org/erddap/tabledap/CBP_CB6_4.graph	CBP Water Quality Monitoring Subset (1984-2018), CB6 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB6_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB6_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB6_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB6_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB6_4&showErrors=false&email=	Penn State	CBP_CB6_4
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_1&showErrors=false&email=	Penn State	CBP_CB7_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1N.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1N	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1N.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 1N	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_1N_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_1N_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_1N/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_1N.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_1N&showErrors=false&email=	Penn State	CBP_CB7_1N
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1S.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1S	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_1S.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 1S	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_1S_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_1S_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_1S/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_1S.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_1S&showErrors=false&email=	Penn State	CBP_CB7_1S
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_2&showErrors=false&email=	Penn State	CBP_CB7_2
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_2E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 2E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_2E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_2E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_2E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_2E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_2E&showErrors=false&email=	Penn State	CBP_CB7_2E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_3&showErrors=false&email=	Penn State	CBP_CB7_3
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_3E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 3E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_3E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_3E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_3E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_3E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_3E&showErrors=false&email=	Penn State	CBP_CB7_3E
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_4&showErrors=false&email=	Penn State	CBP_CB7_4
https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4N.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4N	https://erddap.maracoos.org/erddap/tabledap/CBP_CB7_4N.graph	CBP Water Quality Monitoring Subset (1984-2018), CB7 4N	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB7_4N_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB7_4N_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB7_4N/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB7_4N.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB7_4N&showErrors=false&email=	Penn State	CBP_CB7_4N
https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1	https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1.graph	CBP Water Quality Monitoring Subset (1984-2018), CB8 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB8_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB8_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB8_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB8_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB8_1&showErrors=false&email=	Penn State	CBP_CB8_1
https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1E.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1E	https://erddap.maracoos.org/erddap/tabledap/CBP_CB8_1E.graph	CBP Water Quality Monitoring Subset (1984-2018), CB8 1E	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_CB8_1E_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_CB8_1E_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_CB8_1E/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_CB8_1E.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_CB8_1E&showErrors=false&email=	Penn State	CBP_CB8_1E
https://erddap.maracoos.org/erddap/tabledap/CBP_EE1_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE1_1	https://erddap.maracoos.org/erddap/tabledap/CBP_EE1_1.graph	CBP Water Quality Monitoring Subset (1984-2018), EE1 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE1_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE1_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE1_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE1_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE1_1&showErrors=false&email=	Penn State	CBP_EE1_1
https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_1	https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_1.graph	CBP Water Quality Monitoring Subset (1984-2018), EE2 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE2_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE2_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE2_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE2_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE2_1&showErrors=false&email=	Penn State	CBP_EE2_1
https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_2	https://erddap.maracoos.org/erddap/tabledap/CBP_EE2_2.graph	CBP Water Quality Monitoring Subset (1984-2018), EE2 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE2_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE2_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE2_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE2_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE2_2&showErrors=false&email=	Penn State	CBP_EE2_2
https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_1	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_1.graph	CBP Water Quality Monitoring Subset (1984-2018), EE3 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE3_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE3_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE3_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE3_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE3_1&showErrors=false&email=	Penn State	CBP_EE3_1
https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_2	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_2.graph	CBP Water Quality Monitoring Subset (1984-2018), EE3 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE3_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE3_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE3_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE3_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE3_2&showErrors=false&email=	Penn State	CBP_EE3_2
https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_3	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_3.graph	CBP Water Quality Monitoring Subset (1984-2018), EE3 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE3_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE3_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE3_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE3_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE3_3&showErrors=false&email=	Penn State	CBP_EE3_3
https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_4	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_4.graph	CBP Water Quality Monitoring Subset (1984-2018), EE3 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE3_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE3_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE3_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE3_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE3_4&showErrors=false&email=	Penn State	CBP_EE3_4
https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_5.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_5	https://erddap.maracoos.org/erddap/tabledap/CBP_EE3_5.graph	CBP Water Quality Monitoring Subset (1984-2018), EE3 5	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_EE3_5_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_EE3_5_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_EE3_5/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_EE3_5.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_EE3_5&showErrors=false&email=	Penn State	CBP_EE3_5
https://erddap.maracoos.org/erddap/tabledap/CBP_ET4_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_ET4_2	https://erddap.maracoos.org/erddap/tabledap/CBP_ET4_2.graph	CBP Water Quality Monitoring Subset (1984-2018), ET4 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_ET4_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_ET4_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_ET4_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_ET4_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_ET4_2&showErrors=false&email=	Penn State	CBP_ET4_2
https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_1	https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_1.graph	CBP Water Quality Monitoring Subset (1984-2018), ET5 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_ET5_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_ET5_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_ET5_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_ET5_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_ET5_1&showErrors=false&email=	Penn State	CBP_ET5_1
https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_2	https://erddap.maracoos.org/erddap/tabledap/CBP_ET5_2.graph	CBP Water Quality Monitoring Subset (1984-2018), ET5 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_ET5_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_ET5_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_ET5_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_ET5_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_ET5_2&showErrors=false&email=	Penn State	CBP_ET5_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_1	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_1.graph	CBP Water Quality Monitoring Subset (1984-2018), LE1 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE1_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE1_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE1_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE1_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE1_1&showErrors=false&email=	Penn State	CBP_LE1_1
https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_2	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_2.graph	CBP Water Quality Monitoring Subset (1984-2018), LE1 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE1_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE1_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE1_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE1_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE1_2&showErrors=false&email=	Penn State	CBP_LE1_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_3	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_3.graph	CBP Water Quality Monitoring Subset (1984-2018), LE1 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE1_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE1_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE1_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE1_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE1_3&showErrors=false&email=	Penn State	CBP_LE1_3
https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_4	https://erddap.maracoos.org/erddap/tabledap/CBP_LE1_4.graph	CBP Water Quality Monitoring Subset (1984-2018), LE1 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE1_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE1_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE1_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE1_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE1_4&showErrors=false&email=	Penn State	CBP_LE1_4
https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_2	https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_2.graph	CBP Water Quality Monitoring Subset (1984-2018), LE2 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE2_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE2_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE2_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE2_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE2_2&showErrors=false&email=	Penn State	CBP_LE2_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_3	https://erddap.maracoos.org/erddap/tabledap/CBP_LE2_3.graph	CBP Water Quality Monitoring Subset (1984-2018), LE2 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE2_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE2_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE2_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE2_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE2_3&showErrors=false&email=	Penn State	CBP_LE2_3
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_1	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_1.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_1&showErrors=false&email=	Penn State	CBP_LE3_1
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_2	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_2.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_2&showErrors=false&email=	Penn State	CBP_LE3_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_3	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_3.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_3&showErrors=false&email=	Penn State	CBP_LE3_3
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_4	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_4.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_4&showErrors=false&email=	Penn State	CBP_LE3_4
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_6.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_6	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_6.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 6	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_6_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_6_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_6/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_6.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_6&showErrors=false&email=	Penn State	CBP_LE3_6
https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_7.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_7	https://erddap.maracoos.org/erddap/tabledap/CBP_LE3_7.graph	CBP Water Quality Monitoring Subset (1984-2018), LE3 7	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE3_7_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE3_7_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE3_7/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE3_7.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE3_7&showErrors=false&email=	Penn State	CBP_LE3_7
https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_1	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_1.graph	CBP Water Quality Monitoring Subset (1984-2018), LE4 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE4_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE4_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE4_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE4_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE4_1&showErrors=false&email=	Penn State	CBP_LE4_1
https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_2	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_2.graph	CBP Water Quality Monitoring Subset (1984-2018), LE4 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE4_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE4_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE4_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE4_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE4_2&showErrors=false&email=	Penn State	CBP_LE4_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_3	https://erddap.maracoos.org/erddap/tabledap/CBP_LE4_3.graph	CBP Water Quality Monitoring Subset (1984-2018), LE4 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE4_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE4_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE4_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE4_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE4_3&showErrors=false&email=	Penn State	CBP_LE4_3
https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_1	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_1.graph	CBP Water Quality Monitoring Subset (1984-2018), LE5 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE5_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE5_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE5_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE5_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE5_1&showErrors=false&email=	Penn State	CBP_LE5_1
https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_2	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_2.graph	CBP Water Quality Monitoring Subset (1984-2018), LE5 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE5_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE5_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE5_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE5_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE5_2&showErrors=false&email=	Penn State	CBP_LE5_2
https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_3	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_3.graph	CBP Water Quality Monitoring Subset (1984-2018), LE5 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE5_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE5_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE5_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE5_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE5_3&showErrors=false&email=	Penn State	CBP_LE5_3
https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_4	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_4.graph	CBP Water Quality Monitoring Subset (1984-2018), LE5 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE5_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE5_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE5_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE5_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE5_4&showErrors=false&email=	Penn State	CBP_LE5_4
https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_6.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_6	https://erddap.maracoos.org/erddap/tabledap/CBP_LE5_6.graph	CBP Water Quality Monitoring Subset (1984-2018), LE5 6	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_LE5_6_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_LE5_6_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_LE5_6/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_LE5_6.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_LE5_6&showErrors=false&email=	Penn State	CBP_LE5_6
https://erddap.maracoos.org/erddap/tabledap/CBP_MAT0016.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_MAT0016	https://erddap.maracoos.org/erddap/tabledap/CBP_MAT0016.graph	CBP Water Quality Monitoring Subset (1984-2018), MAT0016	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_MAT0016_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_MAT0016_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_MAT0016/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_MAT0016.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_MAT0016&showErrors=false&email=	Penn State	CBP_MAT0016
https://erddap.maracoos.org/erddap/tabledap/CBP_RET1_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET1_1	https://erddap.maracoos.org/erddap/tabledap/CBP_RET1_1.graph	CBP Water Quality Monitoring Subset (1984-2018), RET1 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET1_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET1_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET1_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET1_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET1_1&showErrors=false&email=	Penn State	CBP_RET1_1
https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_1	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_1.graph	CBP Water Quality Monitoring Subset (1984-2018), RET2 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET2_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET2_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET2_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET2_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET2_1&showErrors=false&email=	Penn State	CBP_RET2_1
https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_2	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_2.graph	CBP Water Quality Monitoring Subset (1984-2018), RET2 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET2_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET2_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET2_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET2_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET2_2&showErrors=false&email=	Penn State	CBP_RET2_2
https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_4	https://erddap.maracoos.org/erddap/tabledap/CBP_RET2_4.graph	CBP Water Quality Monitoring Subset (1984-2018), RET2 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET2_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET2_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET2_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET2_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET2_4&showErrors=false&email=	Penn State	CBP_RET2_4
https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_1	https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_1.graph	CBP Water Quality Monitoring Subset (1984-2018), RET3 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET3_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET3_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET3_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET3_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET3_1&showErrors=false&email=	Penn State	CBP_RET3_1
https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_2	https://erddap.maracoos.org/erddap/tabledap/CBP_RET3_2.graph	CBP Water Quality Monitoring Subset (1984-2018), RET3 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET3_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET3_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET3_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET3_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET3_2&showErrors=false&email=	Penn State	CBP_RET3_2
https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_1	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_1.graph	CBP Water Quality Monitoring Subset (1984-2018), RET4 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET4_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET4_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET4_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET4_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET4_1&showErrors=false&email=	Penn State	CBP_RET4_1
https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_2	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_2.graph	CBP Water Quality Monitoring Subset (1984-2018), RET4 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET4_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET4_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET4_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET4_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET4_2&showErrors=false&email=	Penn State	CBP_RET4_2
https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_3	https://erddap.maracoos.org/erddap/tabledap/CBP_RET4_3.graph	CBP Water Quality Monitoring Subset (1984-2018), RET4 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET4_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET4_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET4_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET4_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET4_3&showErrors=false&email=	Penn State	CBP_RET4_3
https://erddap.maracoos.org/erddap/tabledap/CBP_RET5_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_RET5_2	https://erddap.maracoos.org/erddap/tabledap/CBP_RET5_2.graph	CBP Water Quality Monitoring Subset (1984-2018), RET5 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_RET5_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_RET5_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_RET5_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_RET5_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_RET5_2&showErrors=false&email=	Penn State	CBP_RET5_2
https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_3	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_3.graph	CBP Water Quality Monitoring Subset (1984-2018), TF1 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF1_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF1_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF1_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF1_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF1_3&showErrors=false&email=	Penn State	CBP_TF1_3
https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_5.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_5	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_5.graph	CBP Water Quality Monitoring Subset (1984-2018), TF1 5	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF1_5_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF1_5_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF1_5/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF1_5.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF1_5&showErrors=false&email=	Penn State	CBP_TF1_5
https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_6.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_6	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_6.graph	CBP Water Quality Monitoring Subset (1984-2018), TF1 6	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF1_6_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF1_6_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF1_6/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF1_6.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF1_6&showErrors=false&email=	Penn State	CBP_TF1_6
https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_7.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_7	https://erddap.maracoos.org/erddap/tabledap/CBP_TF1_7.graph	CBP Water Quality Monitoring Subset (1984-2018), TF1 7	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF1_7_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF1_7_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF1_7/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF1_7.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF1_7&showErrors=false&email=	Penn State	CBP_TF1_7
https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_1	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_1.graph	CBP Water Quality Monitoring Subset (1984-2018), TF2 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF2_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF2_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF2_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF2_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF2_1&showErrors=false&email=	Penn State	CBP_TF2_1
https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_2	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_2.graph	CBP Water Quality Monitoring Subset (1984-2018), TF2 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF2_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF2_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF2_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF2_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF2_2&showErrors=false&email=	Penn State	CBP_TF2_2
https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_3	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_3.graph	CBP Water Quality Monitoring Subset (1984-2018), TF2 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF2_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF2_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF2_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF2_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF2_3&showErrors=false&email=	Penn State	CBP_TF2_3
https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_4	https://erddap.maracoos.org/erddap/tabledap/CBP_TF2_4.graph	CBP Water Quality Monitoring Subset (1984-2018), TF2 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF2_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF2_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF2_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF2_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF2_4&showErrors=false&email=	Penn State	CBP_TF2_4
https://erddap.maracoos.org/erddap/tabledap/CBP_TF3_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_TF3_3	https://erddap.maracoos.org/erddap/tabledap/CBP_TF3_3.graph	CBP Water Quality Monitoring Subset (1984-2018), TF3 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_TF3_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_TF3_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_TF3_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_TF3_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_TF3_3&showErrors=false&email=	Penn State	CBP_TF3_3
https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_1	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_1.graph	CBP Water Quality Monitoring Subset (1984-2018), WE4 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WE4_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WE4_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WE4_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WE4_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WE4_1&showErrors=false&email=	Penn State	CBP_WE4_1
https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_2.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_2	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_2.graph	CBP Water Quality Monitoring Subset (1984-2018), WE4 2	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WE4_2_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WE4_2_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WE4_2/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WE4_2.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WE4_2&showErrors=false&email=	Penn State	CBP_WE4_2
https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_3.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_3	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_3.graph	CBP Water Quality Monitoring Subset (1984-2018), WE4 3	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WE4_3_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WE4_3_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WE4_3/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WE4_3.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WE4_3&showErrors=false&email=	Penn State	CBP_WE4_3
https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_4.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_4	https://erddap.maracoos.org/erddap/tabledap/CBP_WE4_4.graph	CBP Water Quality Monitoring Subset (1984-2018), WE4 4	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WE4_4_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WE4_4_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WE4_4/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WE4_4.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WE4_4&showErrors=false&email=	Penn State	CBP_WE4_4
https://erddap.maracoos.org/erddap/tabledap/CBP_WT5_1.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WT5_1	https://erddap.maracoos.org/erddap/tabledap/CBP_WT5_1.graph	CBP Water Quality Monitoring Subset (1984-2018), WT5 1	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WT5_1_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WT5_1_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WT5_1/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WT5_1.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WT5_1&showErrors=false&email=	Penn State	CBP_WT5_1
https://erddap.maracoos.org/erddap/tabledap/CBP_WXT0001.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_WXT0001	https://erddap.maracoos.org/erddap/tabledap/CBP_WXT0001.graph	CBP Water Quality Monitoring Subset (1984-2018), WXT0001	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_WXT0001_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_WXT0001_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_WXT0001/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_WXT0001.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_WXT0001&showErrors=false&email=	Penn State	CBP_WXT0001
https://erddap.maracoos.org/erddap/tabledap/CBP_XFB1986.subset	https://erddap.maracoos.org/erddap/tabledap/CBP_XFB1986	https://erddap.maracoos.org/erddap/tabledap/CBP_XFB1986.graph	CBP Water Quality Monitoring Subset (1984-2018), XFB1986	This product was developed as part of the project supported by the grant from and the National Oceanic and Atmospheric Administration’s Ocean Acidification Program under award NA18OAR0170430 to the Virginia Institute of Marine Science. The data product consists of water quality data for tidal 98 stations for 1984–2018. The source data used to generate this product were downloaded from the Chesapeake Bay Program’s (CBP) data hub. Out of the total of 255 monitoring stations in the Tidal Monitoring Program, we selected 98 with the long monitoring record (30 years or longer). The following variables were downloaded from the data hub at the native temporal and vertical resolution (between one and four cruises per month and approximately 10 depth levels sampled between 0 and 37 m) for 1984–2018: water temperature (T), salinity (S), pH, total alkalinity (TA), dissolved oxygen (DO) , and chlorophyll (Chl). All pH data prior to 1998 were removed because of the data quality concerns (Herrmann et al., 2020). Briefly, we found a dramatic difference in long-term trends between stations measured by institutions in the state of Virginia and stations measured by the state of Maryland, particularly from late spring to early fall. The boundary between the station groups runs east–west within the mesohaline portion of the bay, where the Potomac River estuary intersects the mainstem bay. The boundary separates strong negative linear trends to the south (Virginia stations) from neutral and weakly positive linear trends to the north (Maryland stations).\nFor all variables, data entries marked with CBP’s “Problem” and “Qualifier” flags were removed. Additionally, all variables were scanned for extreme outliers: for each variable, data from all stations, depths, and times were combined into a single composite sample for which the 75th and 25th percentiles (i.e., the upper and lower quantiles) and the interquartile range (the difference between the upper and lower quantiles) were calculated. Extreme outliers were defined as the values falling outside of a certain number (censoring criterion) of interquartile ranges from the upper and lower quantiles.\n\ncdm_data_type = TimeSeriesProfile\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_id (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\n... (6 more variables)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/CBP_XFB1986_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/CBP_XFB1986_iso19115.xml	https://erddap.maracoos.org/erddap/info/CBP_XFB1986/index.htmlTable	https://www.chesapeakebay.net/what/downloads/cbp_water_quality_database_1984_present	http://erddap.maracoos.org/erddap/rss/CBP_XFB1986.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=CBP_XFB1986&showErrors=false&email=	Penn State	CBP_XFB1986
https://erddap.maracoos.org/erddap/tabledap/nerrs_hudnpwq.subset	https://erddap.maracoos.org/erddap/tabledap/nerrs_hudnpwq	https://erddap.maracoos.org/erddap/tabledap/nerrs_hudnpwq.graph	NERRS, Hudson River at hudnpwq	NERRS, Hudson River at hudnpwq.\n\ncdm_data_type = TimeSeries\nVARIABLES:\ntime (time of observation, seconds since 1970-01-01T00:00:00Z)\nstation_name (Platform Name)\nlatitude (station latitude, degrees_north)\nlongitude (station longitude, degrees_east)\nF_Temp (1)\nTemp (°C)\nF_Turb (1)\nSal\nF_pH (1)\nF_SpCond (1)\nDO_pct (percent)\nF_DO_pct (1)\nF_DO_mgl (1)\nChlFluor (µg/L)\nDepth (m)\nSpCond (mS/cm)\nDO_mgl (mg/L)\nF_ChlFluor (1)\nF_Depth (1)\npH\nTurb (NTU)\nF_Sal (1)\n	https://erddap.maracoos.org/erddap/metadata/fgdc/xml/nerrs_hudnpwq_fgdc.xml	https://erddap.maracoos.org/erddap/metadata/iso19115/xml/nerrs_hudnpwq_iso19115.xml	https://erddap.maracoos.org/erddap/info/nerrs_hudnpwq/index.htmlTable	www.nerrsdata.org	http://erddap.maracoos.org/erddap/rss/nerrs_hudnpwq.rss	https://erddap.maracoos.org/erddap/subscriptions/add.html?datasetID=nerrs_hudnpwq&showErrors=false&email=	NERRS	nerrs_hudnpwq

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