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ERDDAP
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| Dataset Title: | Dissolved oxygen of discrete water column samples at selected depths collected aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1993, 2012. 
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| Institution: | National Science Foundation (Dataset ID: CruiseDissolvedOxygen) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Files
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|
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";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 7.264848e+8, 1.3273632e+9;
String axis "T";
String calendar "proleptic_gregorian";
Float64 column_id 606;
String column_name "col_606";
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";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range -70.0883, -53.17077;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
Float64 column_id 609;
String column_name "col_609";
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 "lat dec";
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 -78.2083, -59.87933;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
Float64 column_id 610;
String column_name "col_610";
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 "lon dec";
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 -999.0, 3700.0;
String axis "Z";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
Float64 column_id 613;
String column_name "col_613";
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";
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";
}
event {
Int16 _FillValue 32767;
Int16 actual_range 1, 1311;
Float64 column_id 605;
String column_name "col_605";
String ioos_category "Unknown";
String long_name "Event";
String lter_column_description "sequence of cruise happenings ordered by time";
String lter_column_name "event number";
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";
}
grid_line {
Float64 column_id 607;
String column_name "col_607";
String ioos_category "Unknown";
String long_name "Grid Line";
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 608;
String column_name "col_608";
String ioos_category "Unknown";
String long_name "Grid Station";
String lter_column_description "Palmer LTER grid station";
String lter_column_name "grid station";
String lter_mscale "nominal";
}
bottle {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range -18, 23;
Float64 column_id 612;
String column_name "col_612";
String ioos_category "Unknown";
String long_name "Bottle";
String lter_column_description "reference number of sample bottle from rosette";
String lter_column_name "bottle 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";
}
oxygen_concentration {
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range -999.0, 19.038;
Float64 column_id 614;
String column_name "col_614";
String ioos_category "Dissolved O2";
String long_name "Oxygen Concentration";
String lter_column_description "oxygen";
String lter_column_name "O2";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "ml/L";
String lter_units_string "milliliterPerLiter_keep";
String units "mL L-1";
String units_conventions "ARC-LTER,FCE-LTER,GCE-LTER,GCE-LTER,MCR-LTER,PAL-LTER";
}
oxygen_concentration_moles {
Float64 _FillValue 9.969209968386869e+36;
Float64 actual_range -999.0, 1416.8;
Float64 column_id 615;
String column_name "col_615";
String ioos_category "Dissolved O2";
String long_name "Oxygen Concentration Moles";
String lter_column_description "oxygen";
String lter_column_name "O2";
String lter_mscale "ratio";
String lter_num_type "real";
String lter_units "µmol/L";
String lter_units_string "micromolePerLiter";
String units "micromoles L-1";
String units_conventions "HFR-LTER,PAL-LTER,PIE-LTER";
}
comments {
Float64 actual_range 0.001, 417.4;
Float64 column_id 616;
String column_name "col_616";
String ioos_category "Unknown";
String long_name "Comments";
String lter_column_description "text field to describe a log entry (ex. event log)";
String lter_column_name "comments (rec)";
String lter_mscale "nominal";
Float64 missing_value NaN;
}
}
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. \\n\\nPalmer 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 "hducklow@ldeo.columbia.edu";
String contributor_name "Hugh Ducklow";
String contributor_role "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 "50";
String datazoo_datatable_id "50";
String datazoo_datatable_label "Dissolved Oxygen (Cruise)";
String datazoo_datatable_name "DissolvedOxygen";
String date_created "2021-08-31T15:30:52Z";
String date_issued "2021-08-31T15:30:52Z";
String defaultDataQuery "null";
String defaultGraphQuery "time,oxygen_concentration&.draw=markers&.marker=6%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff&.yRange=0%7C%7Ctrue%7C";
String doi "https://doi.org/10.6073/pasta/e6bdf295bda80b876ab53366781ea05c";
Float64 Easternmost_Easting -59.87933;
String featureType "Trajectory";
String geospatial_bounds_crs "EPSG:4326";
String geospatial_bounds_vertical_crs "EPSG:5831";
Float64 geospatial_lat_max -53.17077;
Float64 geospatial_lat_min -70.0883;
String geospatial_lat_resolution "0.00001 degree";
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -59.87933;
Float64 geospatial_lon_min -78.2083;
String geospatial_lon_resolution "0.00001 degree";
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 3700.0;
Float64 geospatial_vertical_min -999.0;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"/Users/kerfoot/data/lter/data/tsv/dat_50/dat_50_PD97-01.tsv
2025-05-04T13:59:39Z (local files)
2025-05-04T13:59:39Z http://pallter-data.marine.rutgers.edu/erddap/tabledap/CruiseDissolvedOxygen.html";
String infoUrl "https://pal.lternet.edu/";
String institution "National Science Foundation";
String keywords "biogeochemistry, communities, decomposition, ecology, ecosystems, food webs, habitats, Inorganic Matter, inorganic nutrients, marine, primary production, productivity, trophic dynamics";
String keywords_vocabulary "LTER Core Areas,LTER Controlled Vocabulary";
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: Dissolved oxygen analyses were performed with an automated oxygen titrator using amperometric end-point detection (Dickson, 1994). Dissolved oxygen samples were drawn from Niskin bottles into calibrated 125-150 ml iodine titration flasks using silicon tubing to avoid contamination of DOC and CDOM samples. Bottles were rinsed three times and filled from the bottom, overflowing three volumes while taking care not to entrain any bubbles. Samples were fixed with MnCl2 and NaOH/NaI and stored at room temperature for up to 3 days prior to analysis. Four replicate 10 ml iodate standards were run every 3-4 days. The reagent blank was determined as the difference between the volumes of thiosulfate required to titrate 1-ml aliquots of the iodate standard.\\n\\nDickson, A. G., 1994. \"Determination of dissolved oxygen in seawater by Winkler titration,\" WOCE Hydrographic Programme Operations and Methods <a href='http://woce.nodc.noaa.gov/woce_v3/wocedata_1/whp/manuals.htm'>http://woce.nodc.noaa.gov/woce_v3/wocedata_1/whp/manuals.htm</a>";
String naming_authority "edu.rutgers.rucool";
Float64 Northernmost_Northing -53.17077;
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_50/dat_50_LMG03-01.tsv";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -70.0883;
String standard_name_vocabulary "CF Standard Name Table v77";
String subsetVariables "study_name, comments";
String summary "Dissolved oxygen of discrete water column samples at selected depths collected aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1993 - 2012. Oxygen is produced by phytoplankton photosynthesis and consumed by respiration of phytoplankton, zooplankton and bacteria. Oxygen also enters and exits the ocean via physical exchange with the atmosphere. Oxygen concentrations in the surface ocean may be supersaturated by photosynthesis and turbulence enhancing air-sea exchange via bubble injection; or undersaturated due to excess respiration. In cases where exchange with the atmosphere is limited, and/or respiration exceeds photosynthesis, oxygen concentration can be reduced to very low levels (hypoxia) or entirely depleted (anoxia). This is uncommon in cold Antarctic Seas where respiration is depressed and oxygen solubility is enhanced by low temperature. Different water masses have characteristic oxygen concentrations which serve as tracers for diagnosing physical mixing and advection. Dissolved oxygen was analyzed by Winkler Titration (see Methods) in Conductivity, Temperature, Depth (CTD)-Rosette bottle samples at all depths sampled until 2012. This measurement was discontinued in 2013. The CTD has duplicate oxygen electrodes that provide continuous vertical profiles of oxygen concentration at all depths on all casts. The vessel also has continuous underway, Optode determination of dissolved oxygen in the surface (ship's intake at 6 meters depth) on all cruises. Finally we now routinely measure net community production by Equilibrator Inlet Mass Spectroscopy (EIMS) on LTER cruises";
String time_coverage_end "2012-01-24T00:00:00Z";
String time_coverage_start "1993-01-08T09:20:00Z";
String title "Dissolved oxygen of discrete water column samples at selected depths collected aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1993, 2012.";
Float64 Westernmost_Easting -78.2083;
}
}
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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
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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
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constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.