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 "2026-04-07T15:00:16Z (local files)
2026-04-07T15:00:16Z https://erddap.eofrom.space/erddap/tabledap/nutrients_5aba_56d1_fc1c.das";
    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";
  }
}