Easy Access to PMEL Scientific Data
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Dataset Title:	PMEL Atmospheric Chemistry RITS-93 DMS data
Institution:	NOAA (Dataset ID: ACG_RITS-93_Surveyor_dms)
Range:	longitude = -149.653 to -62.758°E, latitude = -68.005 to 54.511°N, altitude = 18.0 to 18.0m, time = 1993-03-21T16:30:00Z to 1993-05-07T00:30:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| 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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 7.327314e+8, 7.367346e+8;
    String axis "T";
    String comment "Start of sampling period";
    String coords "time";
    String ioos_category "Time";
    String long_name "Datetime UTC";
    String source_name "datetime_utc";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  trajectory_id {
    String cf_role "trajectory_id";
    String coords "time";
    String ioos_category "Identifier";
    String long_name "Trajectory ID";
  }
  duration {
    Int32 _FillValue 2147483647;
    Int32 actual_range 3600, 3600;
    String coords "time";
    String ioos_category "Time";
    String long_name "Duration";
    String units "second";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -68.005, 54.511;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String coords "time";
    String instrument "GPS";
    String ioos_category "Location";
    String long_name "Latitude";
    String source "surface observation";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 90.0;
    Float64 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -149.653, -62.758;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String coords "time";
    String instrument "GPS";
    String ioos_category "Location";
    String long_name "Longitude";
    String source "surface observation";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max 180.0;
    Float64 valid_min -180.0;
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 18.0, 18.0;
    String axis "Z";
    Float64 colorBarMinimum 0.0;
    String coords "time";
    String ioos_category "Location";
    String long_name "height above mean sea level";
    String positive "up";
    String standard_name "altitude";
    String units "m";
    Float64 valid_min 0.0;
  }
  dms_seawater {
    Float64 _FillValue NaN;
    Float64 actual_range 0.29, 5.01;
    String coords "time";
    String instrument "Custom purge and trap gas chromatograph";
    String ioos_category "Unknown";
    String long_name "Seawater DMS concentration";
    String source "surface ocean observation";
    String units "nmol L-1";
  }
  dms_air {
    Float64 _FillValue NaN;
    Float64 actual_range 9.8, 337.6;
    String coords "time";
    String instrument "Custom purge and trap gas chromatograph";
    String ioos_category "Unknown";
    String long_name "Atmospheric DMS concentration";
    String source "surface ocean observation";
    String units "nmol L-1";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Trajectory";
    String cdm_trajectory_variables "trajectory_id";
    String comment 
"DMS:

DMS was measured with a Gas Chromatograph System. Details can be found in Bates et al., J. Geophys. Res. 103, 16369-16,383, 1998 and Bates and Quinn, Geophys. Res. Lett., 24, 861-864, 1997.";
    String contributor_name "Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov";
    String Conventions "COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0";
    String creator_email "derek.coffman@noaa.gov";
    String creator_name "Coffman, Derek";
    String creator_url "https://www.pmel.noaa.gov/";
    String dimensions "time=1113";
    Float64 Easternmost_Easting -62.758;
    String featureType "Trajectory";
    Float64 geospatial_lat_max 54.511;
    Float64 geospatial_lat_min -68.005;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -62.758;
    Float64 geospatial_lon_min -149.653;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 18.0;
    Float64 geospatial_vertical_min 18.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"2025-12-09T15:02:38Z (local files)
2025-12-09T15:02:38Z https://data.pmel.noaa.gov/pmel/tabledap/ACG_RITS-93_Surveyor_dms.das";
    String infoUrl "https://www.pmel.noaa.gov/acg/data/index.html";
    String institution "NOAA";
    String keywords "above, altitude, atmosphere, atmospheric, chemistry, concentration, data, datetime, dms, dms_air, dms_seawater, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, identifier, laboratory, latitude, level, longitude, marine, mean, noaa, pacific, pmel, rits, rits-93, science, sea, seawater, station, time, trajectory, trajectory_id, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0).";
    Float64 Northernmost_Northing 54.511;
    String platform "Surveyor";
    String product_version "1.0";
    String project "RITS-93";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -68.005;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "trajectory_id, duration, altitude";
    String summary 
"The RITS 1993 and RITS 1994 cruises were conducted eight months apart in order to assess regional and seasonal variations in trace gases and aerosols along the long latitudinal transect. Measurements were made of sulfur, carbon and nitrogen gas phase species in the ocean and overlying atmosphere in order to quantify their cycling in the surface ocean and to calculate their emission to the atmosphere. The chemical, physical and radiative properties of atmospheric aerosol particles were measured and related to relate synoptic scale meteorology and air mass sources.

The ship departed Punta Arenas, Chile on 20 March 1993, crossed the Drake Passage to Palmer Station on the Antarctic Peninsula, continued southwest to approximately 67°S, 140°W, and then headed north to 57°N, 140°W, arriving in Seattle on 7 May 1993. The RITS 1994 cruise reversed this track, departing Seattle on 20 November 1993 and arriving in Punta Arenas, Chile on 7 January 1994.";
    String time_coverage_end "1993-05-07T00:30:00Z";
    String time_coverage_start "1993-03-21T16:30:00Z";
    String title "PMEL Atmospheric Chemistry RITS-93 DMS data";
    Float64 Westernmost_Easting -149.653;
  }
}

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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