ERDDAP > tabledap > Data Access Form

Dataset Title:	WCO - L4 - Nutrients
Institution:	Plymouth Marine Laboratory   (Dataset ID: nutrients_5aba_56d1_fc1c)
Information:	Summary | License | Metadata | Background | Subset | Files | Make a graph

 

Variable	Optional Constraint #1		Optional Constraint #2		Minimum    or a List of Values	Maximum
Station	!= =~ <= >= = < >		!= =~ <= >= = < >		"L4"
time (Date (UTC), UTC)	!= =~ <= >= = < >		!= =~ <= >= = < >
depth (Depth below sea surface, m)	!= =~ <= >= = < >		!= =~ <= >= = < >		0	50
NITRITE (uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		0.0	2.54
NITRITE_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		"1"	"1"
NITRATE_NIT (NITRATE+NIT, uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		0.0	16.25
NITRATE_NIT_QC (NITRATE+NIT_QC)	!= =~ <= >= = < >		!= =~ <= >= = < >		"1"	"3"
AMMONIA (uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		0.0	4.22
AMMONIA_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		"2"	"4"
SILICATE (uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		0.04	13.66
SILICATE_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		"1"	"1"
PHOSPHATE (uM)	!= =~ <= >= = < >		!= =~ <= >= = < >		0.0	1.05
PHOSPHATE_QC	!= =~ <= >= = < >		!= =~ <= >= = < >		"1"	"4"
Frozen	!= =~ <= >= = < >		!= =~ <= >= = < >		"n" "y"
Filtered	!= =~ <= >= = < >		!= =~ <= >= = < >		"n" "y"

 

Server-side Functions

distinct()

orderBy orderByDescending orderByClosest orderByCount orderByLimit orderByMax orderByMin orderByMinMax orderByMean orderBySum (" Station time depth NITRITE NITRITE_QC NITRATE_NIT NITRATE_NIT_QC AMMONIA AMMONIA_QC SILICATE SILICATE_QC PHOSPHATE PHOSPHATE_QC Frozen Filtered Station time depth NITRITE NITRITE_QC NITRATE_NIT NITRATE_NIT_QC AMMONIA AMMONIA_QC SILICATE SILICATE_QC PHOSPHATE PHOSPHATE_QC Frozen Filtered Station time depth NITRITE NITRITE_QC NITRATE_NIT NITRATE_NIT_QC AMMONIA AMMONIA_QC SILICATE SILICATE_QC PHOSPHATE PHOSPHATE_QC Frozen Filtered Station time depth NITRITE NITRITE_QC NITRATE_NIT NITRATE_NIT_QC AMMONIA AMMONIA_QC SILICATE SILICATE_QC PHOSPHATE PHOSPHATE_QC Frozen Filtered Station time depth NITRITE NITRITE_QC NITRATE_NIT NITRATE_NIT_QC AMMONIA AMMONIA_QC SILICATE SILICATE_QC PHOSPHATE PHOSPHATE_QC Frozen Filtered ")

File type: (more information) .asc - View OPeNDAP-style ISO-8859-1 comma-separated text. .csv - Download a ISO-8859-1 comma-separated text table (line 1: names; line 2: units; ISO 8601 times). .csvp - Download a ISO-8859-1 .csv file with line 1: name (units). Times are ISO 8601 strings. .csv0 - Download a ISO-8859-1 .csv file without column names or units. Times are ISO 8601 strings. .dataTable - A JSON file formatted for use with the Google Visualization client library (Google Charts). .das - View the dataset's metadata via an ISO-8859-1 OPeNDAP Dataset Attribute Structure (DAS). .dds - View the dataset's structure via an ISO-8859-1 OPeNDAP Dataset Descriptor Structure (DDS). .dods - OPeNDAP clients use this to download the data in the DODS binary format. .esriCsv - Download a ISO_8859_1 .csv file for ESRI's ArcGIS 9.x and below (separate date and time columns). .fgdc - View the dataset's UTF-8 FGDC .xml metadata. .geoJson - Download longitude,latitude,otherColumns data as a UTF-8 GeoJSON .json file. .graph - View a Make A Graph web page. .help - View a web page with a description of tabledap. .html - View an OPeNDAP-style HTML Data Access Form. .htmlTable - View a UTF-8 .html web page with the data in a table. Times are ISO 8601 strings. .iso19115 - View the dataset's ISO 19115-2/19139 UTF-8 .xml metadata. .itx - Download an ISO-8859-1 Igor Text File. Each response column becomes a wave. .json - View a table-like UTF-8 JSON file (missing value = 'null'; times are ISO 8601 strings). .jsonlCSV1 - View a UTF-8 JSON Lines CSV file with column names on line 1 (mv = 'null'; times are ISO 8601 strings). .jsonlCSV - View a UTF-8 JSON Lines CSV file without column names (mv = 'null'; times are ISO 8601 strings). .jsonlKVP - View a UTF-8 JSON Lines file with Key:Value pairs (missing value = 'null'; times are ISO 8601 strings). .mat - Download a MATLAB binary file. .nc - Download a flat, table-like, NetCDF-3 binary file with COARDS/CF/ACDD metadata. .ncHeader - View the UTF-8 header (the metadata) for the NetCDF-3 .nc file. .ncCF - Download a NetCDF-3 CF Discrete Sampling Geometries file (Contiguous Ragged Array). .ncCFHeader - View the UTF-8 header (the metadata) for the .ncCF file. .ncCFMA - Download a NetCDF-3 CF Discrete Sampling Geometries file (Multidimensional Array). .ncCFMAHeader - View the UTF-8 header (the metadata) for the .ncCFMA file. .nccsv - Download a NetCDF-3-like 7-bit ASCII NCCSV .csv file with COARDS/CF/ACDD metadata. .nccsvMetadata - View the dataset's metadata as the top half of a 7-bit ASCII NCCSV .csv file. .ncoJson - Download a UTF-8 NCO lvl=2 JSON file with COARDS/CF/ACDD metadata. .odvTxt - Download longitude,latitude,time,otherColumns as an ISO-8859-1 ODV Generic Spreadsheet File (.txt). .subset - View an HTML form which uses faceted search to simplify picking subsets of the data. .tsv - Download a ISO-8859-1 tab-separated text table (line 1: names; line 2: units; ISO 8601 times). .tsvp - Download a ISO-8859-1 .tsv file with line 1: name (units). Times are ISO 8601 strings. .tsv0 - Download a ISO-8859-1 .tsv file without column names or units. Times are ISO 8601 strings. .wav - Download a .wav audio file. All columns must be numeric and of the same type. .xhtml - View a UTF-8 XHTML (XML) file with the data in a table. Times are ISO 8601 strings. .kml - View a .kml file, suitable for Google Earth. .smallPdf - View a small .pdf image file with a graph or map. .pdf - View a standard, medium-sized .pdf image file with a graph or map. .largePdf - View a large .pdf image file with a graph or map. .smallPng - View a small .png image file with a graph or map. .png - View a standard, medium-sized .png image file with a graph or map. .largePng - View a large .png image file with a graph or map. .transparentPng - View a .png image file (just the data, without axes, landmask, or legend).

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  time {
    String _CoordinateAxisType "Time";
    String axis "T";
    String ioos_category "Time";
    String long_name "Date (UTC)";
    String source_name "Date";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 0, 50;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth below sea surface";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  NITRITE {
    Float64 actual_range 0.0, 2.54;
    String ioos_category "Dissolved Nutrients";
    String long_name "NITRITE";
    String standard_name "nitrate";
    String units "uM";
    Float64 valid_max 2.5;
    Float64 valid_min 0.0;
  }
  NITRITE_QC {
    String ioos_category "Dissolved Nutrients";
    String long_name "NITRITE_QC";
    String vocabulary "https://vocab.nerc.ac.uk/collection/L20/current/";
  }
  NITRATE_NIT {
    Float64 actual_range 0.0, 16.25;
    String ioos_category "Dissolved Nutrients";
    String long_name "NITRATE+NIT";
    String units "uM";
    Float64 valid_max 20.0;
    Float64 valid_min 0.0;
  }
  NITRATE_NIT_QC {
    String ioos_category "Dissolved Nutrients";
    String long_name "NITRATE+NIT_QC";
    String vocabulary "https://vocab.nerc.ac.uk/collection/L20/current/";
  }
  AMMONIA {
    Float64 actual_range 0.0, 4.22;
    String ioos_category "Dissolved Nutrients";
    String long_name "AMMONIA";
    String units "uM";
    Float64 valid_max 5.0;
    Float64 valid_min 0.0;
  }
  AMMONIA_QC {
    String ioos_category "Dissolved Nutrients";
    String long_name "AMMONIA_QC";
    String vocabulary "https://vocab.nerc.ac.uk/collection/L20/current/";
  }
  SILICATE {
    Float64 actual_range 0.04, 13.66;
    String ioos_category "Dissolved Nutrients";
    String long_name "SILICATE";
    String units "uM";
    Float64 valid_max 20.0;
    Float64 valid_min 0.0;
  }
  SILICATE_QC {
    String ioos_category "Dissolved Nutrients";
    String long_name "SILICATE_QC";
    String vocabulary "https://vocab.nerc.ac.uk/collection/L20/current/";
  }
  PHOSPHATE {
    Float64 actual_range 0.0, 1.05;
    String ioos_category "Dissolved Nutrients";
    String long_name "PHOSPHATE";
    String units "uM";
    Float64 valid_max 1.5;
    Float64 valid_min 0.0;
  }
  PHOSPHATE_QC {
    String ioos_category "Dissolved Nutrients";
    String long_name "PHOSPHATE_QC";
    String vocabulary "https://vocab.nerc.ac.uk/collection/L20/current/";
  }
  Frozen {
    String ioos_category "Unknown";
    String long_name "Frozen";
  }
  Filtered {
    String ioos_category "Unknown";
    String long_name "Filtered";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "lude@pml.ac.uk";
    String creator_name "Lucinda Derbyshire (lude at pml.ac.uk)";
    String creator_type "institution";
    Float64 geospatial_vertical_max 50.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2026-04-07T15:00:17Z (local files)
2026-04-07T15:00:17Z https://erddap.eofrom.space/erddap/tabledap/nutrients_5aba_56d1_fc1c.html";
    String infoUrl "https://westernchannelobservatory.org.uk/l4_nutrients.php";
    String institution "Plymouth Marine Laboratory";
    String keywords "ammonia, dissolved nutrients, L4, nitrite, nutrients, phosphate, silicate";
    String license "OGL";
    String licenseUrl "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ (external link)";
    String metadata_version "0.1.6";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "Station, Frozen, Filtered";
    String summary "L4 - Nutrients. The nutrient samples for L4 are taken weekly where conditions allow. They are sampled under clean conditions and returned as soon as possible in the cool and dark to the laboratory in Plymouth where triplicate samples are analysed for filtered (0.2µm Millipore Fluoropore) water. This gives us essentially 'live' results which are processed and uploaded as soon as possible after analysis. Samples are not frozen unless there are extenuating circumstances making the live analysis impossible. The analyser is a 5-channel SEAL segmented flow system using well tested methodologies; the same as those used by the PML nutrient group in all their International Research cruises, and research programmes. As the samples are taken and stored for sometimes 2-3 hours before returning for analysis, and sometimes frozen, the concentrations for Ammonium should be treated with care due to it being subject to storage and contamination problems. The Ammonium data should be viewed more as trends rather than highly accurate concentrations. Quality control procedures are carried out using KANSO certified reference materials, the group also participates in the Quasimeme programme. This has been the protocol since 2007, prior to that, the samples were stored frozen and analysed in batches. The L4 data record contains the surface values presented in graphical format here; depth profiles of nutrients at L4 are available since February 2012.";
    String time_coverage_start "2000-01-17";
    String title "WCO - L4 - Nutrients";
  }
}

 

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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 Data Access Protocol (DAP) and its selection constraints.

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.
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For example,
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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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