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ERDDAP
Easier access to scientific data |
Brought to you by NOAA NMFS SWFSC ERD |
| Dataset Title: | Chlorophyll and phaeopigments from water column samples, collected at selected depths aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1991 - 2019. 
|
| Institution: | National Science Foundation (Dataset ID: CruiseChlorophyll) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Files
| Make a graph
|
Attributes {
s {
study_name {
String cf_role "trajectory_id";
String column_name "studyName";
String comment "Cruise name";
String ioos_category "Identifier";
String long_name "Study";
}
chlorophyll_a {
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range 0.0, 13292.5;
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
Float64 column_id 298;
String column_name "col_298";
String ioos_category "Ocean Color";
String lter_column_description "a photosynthetic pigment";
String lter_column_name "Chlorophyll";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "mg/m³";
String lter_units_string "milligramPerMeterCubed";
String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water";
String units "mg m-3";
String units_conventions "EML-LTER";
}
phaeopigment {
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range 0.0, 10447.3;
Float64 column_id 299;
String column_name "col_299";
String ioos_category "Unknown";
String lter_column_description "a non-photosynthetic pigment";
String lter_column_name "Phaeopigment";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "mg/m³";
String lter_units_string "milligramPerMeterCubed";
String units "mg m-3";
String units_conventions "EML-LTER";
}
event {
Float64 column_id 300;
String column_name "col_300";
String ioos_category "Unknown";
String lter_column_description "sequence of cruise happenings ordered by time";
String lter_column_name "Event";
String lter_mscale "interval";
String lter_num_type "real";
String lter_units_string "number";
String units_conventions "EML-2.0.1,EML-2.1.0,EML-LTER";
}
bottle {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 46;
Float64 column_id 301;
String column_name "col_301";
String ioos_category "Unknown";
String lter_column_description "reference number of sample bottle from rosette";
String lter_column_name "Bottle";
String lter_mscale "interval";
String lter_num_type "natural";
String lter_units_string "number";
String units_conventions "EML-2.0.1,EML-2.1.0,EML-LTER";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 6.0710484e+8, 1.54928251e+9;
String axis "T";
String calendar "proleptic_gregorian";
Float64 column_id 441;
String column_name "col_441";
String comment "date and time";
String ioos_category "Time";
String long_name "Time";
String lter_column_description "date and time ";
String lter_column_name "Datetime GMT";
String lter_mscale "dateTime";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
grid_line {
Float64 column_id 442;
String column_name "col_442";
String ioos_category "Unknown";
String lter_column_description "line on a pre-defined survey grid in the LTER Palmer study area";
String lter_column_name "Grid Line";
String lter_mscale "nominal";
}
grid_station {
Float64 column_id 443;
String column_name "col_443";
String ioos_category "Unknown";
String lter_column_description "Palmer LTER grid station";
String lter_column_name "Grid Station";
String lter_mscale "nominal";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range -70.095, -48.35;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
Float64 column_id 444;
String column_name "col_444";
String ioos_category "Location";
String long_name "Latitude";
String lter_column_description "latitude measured from the equator in decimal degrees, South is negative";
String lter_column_name "Latitude";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "º";
String lter_units_string "degree";
String standard_name "latitude";
String units "degrees_north";
String units_conventions "EML-2.0.1,EML-2.1.0,EML-LTER";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range -78.20833, -49.35;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
Float64 column_id 445;
String column_name "col_445";
String ioos_category "Location";
String long_name "Longitude";
String lter_column_description "longitude measured from the Prime Meridian in decimal degrees, West is negative";
String lter_column_name "Longitude";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "º";
String lter_units_string "degree";
String standard_name "longitude";
String units "degrees_east";
String units_conventions "EML-2.0.1,EML-2.1.0,EML-LTER";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range 0.0, 3718.14;
String axis "Z";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
Float64 column_id 446;
String column_name "col_446";
String ioos_category "Location";
String long_name "Depth";
String lter_column_description "measurement or sample collection distance from water column surface";
String lter_column_name "Depth";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "m";
String lter_units_string "meter";
Float64 missing_value -999.0;
String positive "down";
String standard_name "depth";
String units "m";
String units_conventions "AND-LTER,BNZ-LTER,CDR-LTER,EML-2.0.1,EML-2.1.0,EML-LTER,LUQ-LTER,SGS-LTER";
}
irradiance {
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range 0.0, 100.0;
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
Float64 column_id 447;
String column_name "col_447";
String ioos_category "Unknown";
String lter_column_description "The ratio of two light measurements incident on horizontal surfaces at two locations.";
String lter_column_name "Irradiance";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "%";
String lter_units_string "percent";
Float64 missing_value -999.0;
String units "percent";
String units_conventions "BNZ-LTER,CAP-LTER,CDR-LTER,FCE-LTER,GCE-LTER,HBR-LTER,KNZ-LTER,MCM-LTER,NTL-LTER,NWT-LTER,PAL-LTER,PIE-LTER,SGS-LTER";
}
filter_code {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range -128, 126;
Float64 column_id 448;
String column_name "col_448";
String ioos_category "Unknown";
String lter_column_description "Chlorophyll sampling code used by PAL LTER.";
String lter_column_name "Filter Code";
String lter_mscale "nominal";
}
nominal_station {
Float64 column_id 449;
String column_name "col_449";
String ioos_category "Unknown";
String lter_column_description "Palmer LTER grid station";
String lter_column_name "Nominal Station";
String lter_mscale "nominal";
}
cast_number {
Int16 _FillValue 32767;
Int16 actual_range 1, 1997;
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
Float64 column_id 450;
String column_name "col_450";
String ioos_category "Statistics";
String lter_column_description "reference number for ship-based over-the-side deployed and lowered instrumentation";
String lter_column_name "Cast Number";
String lter_mscale "interval";
String lter_num_type "natural";
String lter_units_string "number";
String units_conventions "EML-2.0.1,EML-2.1.0,EML-LTER";
}
notes {
Float64 column_id 1734;
String column_name "col_1734";
String ioos_category "Unknown";
String lter_column_description "text field to describe a log entry (ex. event log)";
String lter_column_name "Notes";
String lter_mscale "nominal";
}
platform {
Float64 column_id 1981;
String column_name "col_1981";
String ioos_category "Unknown";
String lter_column_description "the type of physical staging for instrument deployment or data gathering";
String lter_column_name "Platform";
String lter_mscale "nominal";
}
sampling_device {
Float64 column_id 1982;
String column_name "col_1982";
String ioos_category "Unknown";
String lter_column_description "Device with which a given sample was collected.";
String lter_column_name "Sampling Device";
String lter_mscale "nominal";
}
}
NC_GLOBAL {
String _NCProperties "version=1|netcdflibversion=4.6.1|hdf5libversion=1.10.6";
String acknowledgement "Funding and support provided by the National Science Foundation";
String cdm_data_type "Trajectory";
String cdm_trajectory_variables "study_name";
String comment "The Palmer, Antarctica, Long-Term Ecological Research project is a member site of the Long-Term Ecological Research program, a network of sites investigating diverse biomes. A team of researchers seeks to understand the structure and function of the Western Antarctic Peninsula's marine and terrestrial ecosystems in the context of seasonal-to-interannual atmospheric and sea ice dynamics, as well as long-term climate change. The PAL measurement system (or grid) is designed to study marine and terrestrial food webs consisting principally of diatom primary producers, the dominant herbivore Antarctic krill, and the apex predator Adelie penguin. An attenuated microbial food web is also a focus. PAL studies these ecosystems annually over a regional scale grid of oceanographic stations and seasonally at Palmer Station. Palmer Station is located on Anvers Island west of the Antarctic Peninula. The peninsula runs perpendicular to a strong climatic gradient between the cold, dry continental regime to the south, characteristic of the Antarctic interior, and the warm, moist, maritime regime to the north. North-south shifts in the gradient give rise to large environmental variability to climate change. Sea ice extent and variability affects ecosystem changes at all trophic levels. In addition to the long-term field and research activities, information management, graduate student training, education and outreach are an integral part of the program.";
String contributor_email "oscar@marine.rutgers.edu,mvernet@ucsd.edu,ray@icess.ucsb.edu";
String contributor_name "Oscar Schofield,Maria Vernet,Raymond Smith";
String contributor_role "PrincipalInvestigator,PrincipalInvestigator,PrincipalInvestigator";
String contributor_role_vocabulary "https://vocab.nerc.ac.uk/collection/G04/current/";
String Conventions "CF-1.8, ACDD-1.3, COARDS";
String creator_country "USA";
String creator_email "kerfoot@marine.rutgers.edu";
String creator_institution "Rutgers University";
String creator_name "John Kerfoot";
String creator_sector "academic";
String creator_type "person";
String creator_url "https://rucool.marine.rutgers.edu";
String datazoo_dataset_id "24";
String datazoo_datatable_id "24";
String datazoo_datatable_label "Chlorophyll (Cruise)";
String datazoo_datatable_name "Chlorophyll";
String date_created "2022-02-28T14:26:21Z";
String date_issued "2022-02-28T14:26:21Z";
String defaultDataQuery "null";
String defaultGraphQuery "longitude,latitude&.draw=markers&.marker=6%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff&.yRange=%7C%7Cfalse%7C";
String doi "https://doi.org/10.6073/pasta/585ba08c3ab00f7d36f3756bb8e7f79b";
Float64 Easternmost_Easting -49.35;
String featureType "Trajectory";
String geospatial_bounds_crs "EPSG:4326";
String geospatial_bounds_vertical_crs "EPSG:5831";
Float64 geospatial_lat_max -48.35;
Float64 geospatial_lat_min -70.095;
String geospatial_lat_resolution "0.00001 degree";
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -49.35;
Float64 geospatial_lon_min -78.20833;
String geospatial_lon_resolution "0.00001 degree";
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 3718.14;
Float64 geospatial_vertical_min 0.0;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"local files
2025-05-04T13:55:07Z (local files)
2025-05-04T13:55:07Z http://pallter-data.marine.rutgers.edu/erddap/tabledap/CruiseChlorophyll.html";
String infoUrl "https://pal.lternet.edu/";
String institution "National Science Foundation";
String keywords "biogeochemistry, biomass, chlorophyll, communities, ecology, ecosystems, food webs, habitats, ice, marine, measurements, Primary Production, primary production, remote sensing, Signature, trophic dynamics";
String keywords_vocabulary "LTER Controlled Vocabulary,LTER Core Areas";
String license "All data contained herein is licensed under the LTER Network Data Access Policy (https://lternet.edu/data-access-policy/). In accordance with scientific publishing conventions and professional etiquette, the consumer of these data (the \"Data User\") is expected to appropriately cite these data in any publication that results from their use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur and should realize that misinterpretation of data may occur if used out of context of the original study. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the data authors. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available \"as is.\" The Data User should be aware that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data.";
String license_link "https://lternet.edu/data-access-policy/";
String methods "General Methods: Determined by extraction and measured from a discrete sample using a bench fluorometer.";
String naming_authority "edu.rutgers.rucool";
Float64 Northernmost_Northing -48.35;
String product_version "1.0";
String program "LTER";
String project "Palmer LTER";
String publisher_country "USA";
String publisher_email "kerfoot@marine.rutgers.edu";
String publisher_institution "Rutgers University";
String publisher_name "John Kerfoot";
String publisher_type "person";
String publisher_url "https://rucool.marine.rutgers.edu";
String references "https://pal.lternet.edu/";
String sea_name "Southern Ocean";
String source "/Users/kerfoot/data/lter/data/tsv/dat_24/dat_24_PD97-01.tsv";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -70.095;
String standard_name_vocabulary "CF Standard Name Table v77";
String subsetVariables "study_name,grid_line,grid_station,nominal_station";
String summary "Phytoplankton chlorophyll sampling was led by Smith from 1991-2002, and then by Vernet from 2003-2008. Schofield is the third, and current lead, beginning in 2009. Methods have been kept consistent as much as possible over the full time series and different Principal Investigators. Chlorophyll a (Chl a) is the principal photosynthetic pigment of phytoplankton, and is used as a proxy measurement for estimating phytoplankton biomass in water samples. Chl a concentrations reflect the distribution of active phytoplankton spatially and with depth in the water column and their changes over time. Phaeopigments are non-photosynthetic pigments that are degradation products of phytoplankton chlorophylls which form during and after phytoplankton blooms. Water samples are collected throughout the water column along the Western Antarctic Peninsula at regular LTER grid stations where Conductivity, Temperature, Depth (CTD) casts are preformed and in surface waters at underway stations, where CTD casts are not done, using the ship's flow-through seawater system. Water samples are filtered onto GF/F filters, and filters kept frozen at -80°C until analysis at Palmer Station following the completion of the cruise. Fluorometric chlorophyll and phaeopigment analysis is conducted at Palmer Station through acetone extraction of the GF/F filters and measurement of the extract on a Turner 10AU Fluorometer. The primary source of error for phaeopigment measurement is Chlorophyll b. If high amounts of Chlorophyll b are present in the sample, phaeopigments may be overestimated.";
String time_coverage_end "2019-02-04T12:15:10Z";
String time_coverage_start "1989-03-28T16:14:00Z";
String title "Chlorophyll and phaeopigments from water column samples, collected at selected depths aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1991 - 2019.";
Float64 Westernmost_Easting -78.20833;
}
}
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.
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.