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Dataset Title:  CBP Water Quality Monitoring Subset (1984-2018), CB3 3E Subscribe RSS
Institution:  Penn State   (Dataset ID: CBP_CB3_3E)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Subset | Make a graph
Variable ?   Optional
Constraint #1 ?
Constraint #2 ?
   Minimum ?
   or a List of Values ?
   Maximum ?
 time (time of observation, UTC) ?          1984-07-12T07:55:00Z    2018-09-17T08:34:00Z
  < slider >
 station_id (Platform Name) ?      
   - +  ?
 latitude (station latitude, degrees_north) ?          39.00412    39.00412
  < slider >
 longitude (station longitude, degrees_east) ?          -76.34517    -76.34517
  < slider >
 depth (m) ?      
   - +  ?
  < slider >
 chl (chlorophyll, ug/L) ?          0.934    112.9
 salt (salinity) ?          0.0    19.38
 temp (Water Temperature, degree_C) ?          -0.5    30.4
 oxy (Dissolved Oxygen, mg/L) ?          0.0    15.5
 pH ?          6.6    9.3
Server-side Functions ?
 distinct() ?
? ("Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.")

File type: (more info)

(Documentation / Bypass this form ? )
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 4.58466900000001e+8, 1.537173240000002e+9;
    String axis "T";
    String cf_role "profile_id";
    String ioos_category "Time";
    String long_name "time of observation";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  station_id {
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Platform Name";
    String short_name "edu_vims_CB3.3E";
    String standard_name "platform_name";
    String type "fixed";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 39.00412, 39.00412;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "station latitude";
    String standard_name "latitude";
    String units "degrees_north";
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -76.34517, -76.34517;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "station longitude";
    String standard_name "longitude";
    String units "degrees_east";
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 actual_range 0.5, 10.0;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  chl {
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.934, 112.9;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Ocean Color";
    String long_name "chlorophyll";
    Float64 missing_value -9999.0;
    String platform "station_id";
    String standard_name "mass_concentration_of_chlorophyll_in_sea_water";
    String units "ug/L";
  salt {
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 19.38;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String coordinates "time lat lon depth";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Salinity";
    String long_name "salinity";
    Float64 missing_value -9999.0;
    String platform "station_id";
    String standard_name "sea_water_practical_salinity";
  temp {
    Float64 _FillValue -9999.0;
    Float64 actual_range -0.5, 30.4;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String coordinates "time lat lon depth";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Temperature";
    String long_name "Water Temperature";
    Float64 missing_value -9999.0;
    String platform "station_id";
    String standard_name "sea_water_temperature";
    String units "degree_C";
  oxy {
    Float64 _FillValue -9999.0;
    Float64 actual_range 0.0, 15.5;
    Float64 colorBarMaximum 500.0;
    Float64 colorBarMinimum 0.0;
    String coordinates "time lat lon depth";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Dissolved O2";
    String long_name "Dissolved Oxygen";
    Float64 missing_value -9999.0;
    String platform "station_id";
    String standard_name "mass_concentration_of_oxygen_in_sea_water";
    String units "mg/L";
  pH {
    Float64 _FillValue -9999.0;
    Float64 actual_range 6.6, 9.3;
    Float64 colorBarMaximum 9.0;
    Float64 colorBarMinimum 7.0;
    String ioos_category "Salinity";
    String long_name "sea_water_ph_reported_on_NBS_scale";
    Float64 missing_value -9999.0;
    String name "pH";
    String standard_name "sea_water_ph_reported_on_total_scale";
    String acknowledgement "CBP data hub ( and NOAA OA Program funding: \"RVA-OA2017: Vulnerability of the largest U.S. estuary to acidification: Implications of declining pH for shellfish hatcheries in the Chesapeake Bay";
    String cdm_data_type "TimeSeriesProfile";
    String cdm_profile_variables "time";
    String cdm_timeseries_variables "station_id";
    String contributor_email "";
    String contributor_name "Marjy Friedrichs";
    String contributor_role "principalInvestigator";
    String contributor_role_vocabulary "";
    String contributor_url "";
    String Conventions "CF-1.7, ACDD-1.3, IOOS-1.2";
    String creator_address "405a Walker Building";
    String creator_city "University Park";
    String creator_country "USA";
    String creator_email "";
    String creator_institution "Penn State";
    String creator_name "Maria Herrmann";
    String creator_phone "814-865-0478";
    String creator_postalcode "16802";
    String creator_sector "academic";
    String creator_state "PA";
    String creator_type "person";
    String creator_url "";
    String date_created "2021-08-26T18:47:14Z";
    String date_issued "2021-08-26T18:47:14Z";
    String date_metadata_modified "2021-08-26T18:47:14Z";
    String date_modified "2021-08-26T18:47:14Z";
    Float64 Easternmost_Easting -76.34517;
    String featureType "TimeSeriesProfile";
    String geospatial_bounds "POINT(39.00412 -76.34517)";
    String geospatial_bounds_crs "EPSG:4326";
    String geospatial_bounds_vertical_crs "EPSG:4297";
    Float64 geospatial_lat_max 39.00412;
    Float64 geospatial_lat_min 39.00412;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -76.34517;
    Float64 geospatial_lon_min -76.34517;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 10.0;
    Float64 geospatial_vertical_min 0.5;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String gts_ingest "False";
    String history 
"[2021-08-26] Created NetCDF4 file from maracoos_set98.mat
2024-07-24T00:41:59Z (local files)
    String id "CB3.3E";
    String infoUrl "";
    String institution "Penn State";
    String keywords "'Oceans > Ocean Chemistry > Alkalinity''Oceans > Ocean Chemistry > Chlorophyll''Oceans > Salinity/Density > Salinity''Oceans > Ocean Temperature > Water Temperature''Oceans > Ocean Chemistry > Oxygen'";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.";
    String naming_authority "edu.psu.met";
    String nodc_template_version "NODC_TimeSeriesProfile_Template_v2.0";
    Float64 Northernmost_Northing 39.00412;
    String platform "fixed";
    String platform_id "cbp_CB3.3E";
    String platform_name "Chesapeake Bay Buoy - CB3.3E";
    String platform_vocabulary "";
    String processing_level "For temperature, salinity, pH, alkalinity, oxygen, and chlorophyll: QA/QC of the open-source Chesapeake Bay Program water quality monitoring data (; model output for all other variables";
    String project "NSF OCE‐1537013 OCE‐1536996; NOAA OAP: NA18OAR0170430; PI: Marjorie Friedrichs (";
    String publisher_address "PO BOX 4610";
    String publisher_city "Newark";
    String publisher_country "USA";
    String publisher_email "";
    String publisher_institution "MARACOOS";
    String publisher_name "MARACOOS";
    String publisher_phone "(401) 789-6224";
    String publisher_postalcode "19715";
    String publisher_state "DE";
    String publisher_type "institution";
    String publisher_url "";
    String references "";
    String source "Data from maracoos_set98.mat file created by PSU/VIMS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 39.00412;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "station_id, depth";
    String summary 
"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).
For 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.";
    String time_coverage_duration "PT4740S";
    String time_coverage_end "2018-09-17T08:34:00Z";
    String time_coverage_resolution "PT2100S";
    String time_coverage_start "1984-07-12T07:55:00Z";
    String title "CBP Water Quality Monitoring Subset (1984-2018), CB3 3E";
    Float64 Westernmost_Easting -76.34517;


Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form{?query}
For example,,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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