BCO-DMO ERDDAP
Accessing BCO-DMO data

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Dataset Title:	[AT50-24 IC Data] - Geochemical data from sediment pushcore porewaters and water column Niskin samples collected from Gulf of Alaska, Alaska, USA, in June 2024 on R/V Atlantis cruise AT50-24 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems)
Institution:	BCO-DMO (Dataset ID: bcodmo_dataset_986675_v1)
Range:	longitude = -162.5897 to -148.0007°E, latitude = 53.74811 to 57.46695°N
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  serial {
    String long_name "Serial";
    String units "unitless";
  }
  Fluoride {
    Float32 actual_range 0.0276, 0.1589;
    String long_name "Fluoride";
    String units "millimolar (mM)";
  }
  Acetate {
    Float32 actual_range 0.0076, 0.1275;
    String long_name "Acetate";
    String units "millimolar (mM)";
  }
  Formate {
    Float32 actual_range 8.0e-4, 0.1372;
    String long_name "Formate";
    String units "millimolar (mM)";
  }
  Chloride {
    Float32 actual_range 439.6922, 607.7923;
    String long_name "Chloride";
    String units "millimolar (mM)";
  }
  Bromide {
    Float32 actual_range 0.6488, 1.0263;
    String long_name "Bromide";
    String units "millimolar (mM)";
  }
  Nitrate {
    Float32 actual_range 0.0348, 1.0708;
    String long_name "Nitrate";
    String units "millimolar (mM)";
  }
  Sulfate {
    Float32 actual_range 0.0219, 39.56;
    String long_name "Sulfate";
    String units "millimolar (mM)";
  }
  Thiosulfate {
    Float32 actual_range 0.0278, 2.3439;
    String long_name "Thiosulfate";
    String units "millimolar (mM)";
  }
  Phosphate {
    Float32 actual_range 5.0e-4, 4.7163;
    String long_name "Phosphate";
    String units "millimolar (mM)";
  }
  Lithium {
    Float32 actual_range 0.0247, 0.1011;
    String long_name "Lithium";
    String units "millimolar (mM)";
  }
  Sodium {
    Float32 actual_range 374.9115, 517.9322;
    String long_name "Sodium";
    String units "millimolar (mM)";
  }
  Ammonium {
    Float32 actual_range 0.0746, 2.5862;
    String long_name "Ammonium";
    String units "millimolar (mM)";
  }
  Potassium {
    Float32 actual_range 7.8042, 13.619;
    String long_name "Potassium";
    String units "millimolar (mM)";
  }
  Magnesium {
    Float32 actual_range 38.9727, 59.8736;
    String long_name "Magnesium";
    String units "millimolar (mM)";
  }
  Calcium {
    Float32 actual_range 2.3214, 30.6067;
    String long_name "Calcium";
    String units "millimolar (mM)";
  }
  perchlorate {
    Float32 actual_range 0.0953, 0.3417;
    String long_name "Perchlorate";
    String units "millimolar (mM)";
  }
  pH {
    Float32 actual_range 6.62, 8.53;
    String long_name "Ph";
    String units "unitless";
  }
  Dive {
    String long_name "Dive";
    String units "unitless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 53.74811, 57.46695;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -162.5897, -148.0007;
    String axis "X";
    String ioos_category "Location";
    String long_name "Long";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Horizon {
    String long_name "Horizon";
    String units "centimeters (cm)";
  }
  Date_UTC {
    String long_name "Date_utc";
    String units "unitless";
  }
  Depth_m {
    Float32 actual_range 2009.71, 4898.49;
    String long_name "Depth_m";
    String units "unitless";
  }
  Station {
    String long_name "Station";
    String units "meters (m)";
  }
  Site {
    String long_name "Site";
    String units "unitless";
  }
  Sample_Name {
    String long_name "Sample_name";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_url "https://www.bco-dmo.org/";
    String doi "10.26008/1912/bco-dmo.986675.1";
    Float64 Easternmost_Easting -148.0007;
    Float64 geospatial_lat_max 57.46695;
    Float64 geospatial_lat_min 53.74811;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -148.0007;
    Float64 geospatial_lon_min -162.5897;
    String geospatial_lon_units "degrees_east";
    String history 
"2026-09-16T20:36:59Z (local files)
2026-09-16T20:36:59Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_986675_v1.das";
    String infoUrl "https://osprey.bco-dmo.org/dataset/986675";
    String institution "BCO-DMO";
    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.";
    Float64 Northernmost_Northing 57.46695;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 53.74811;
    String summary "This dataset provides geochemical data (major ions) for porewaters from sediment pushcores collected by DSV Alvin from the R/V Atlantis in June 2024 (AT50-24) at methane seeps in the Aleutian Trench, Alaska, USA. Also included is geochemical data (major ions) for water samples collected by Niskin bottle, both via DSV Alvin and via CTD cast from the ship. Cores were sectioned into 1-3 centimeter (cm) horizons, and porewater was extracted shipboard using an argon-pressurized squeezer. Porewater samples were frozen at sea and thawed just before analysis. We report concentrations of fluoride, acetate, formate, chloride, bromide, nitrate, sulfate, thiosulfate, and phosphate anions and lithium, sodium, potassium, magnesium, and calcium cations. Measurements were made using the Thermo Dual Dionex Integrion HPIC ion chromatography system with either a 250 millimeter (mm) Dionex IonPac AS19-4 micrometer (um) column (anions) or a 250 mm Dionex IonPac CS16-4um column (cations), in the Resnick Water and Environment Laboratory at the California Institute of Technology (Caltech).";
    String title "[AT50-24 IC Data] - Geochemical data from sediment pushcore porewaters and water column Niskin samples collected from Gulf of Alaska, Alaska, USA, in June 2024 on R/V Atlantis cruise AT50-24 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems)";
    Float64 Westernmost_Easting -162.5897;
  }
}

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.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,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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