Accessing BCO-DMO data
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BCO-DMO ERDDAP
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| Dataset Title: | [GP16 GeoFish - Nuts and Sals] - GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_522822) |
| Information: | Summary
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| ISO 19115
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Attributes {
s {
EXPOCODE {
String bcodmo_name "Cruise Name";
String description "expedition code assigned by the CCHDO: NODCShipCodeYearMonthDay";
String long_name "EXPOCODE";
String units "text";
}
SECT_ID {
String bcodmo_name "Cruise Name";
String description "cruise section identification number";
String long_name "SECT ID";
String units "text";
}
GEOTRC_EVENTNO {
Int16 _FillValue 32767;
Int16 actual_range 4014, 4464;
String bcodmo_name "event";
String description "GEOTRACES Event Number";
String long_name "GEOTRC EVENTNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "dimensionless";
}
Station {
String bcodmo_name "station";
String description "Station Number";
String long_name "Station";
String units "dimensionless";
}
GEOTRC_SAMPNO {
Int16 _FillValue 32767;
Int16 actual_range 2091, 10339;
String bcodmo_name "sample";
String description "GEOTRACES Sample Number";
String long_name "GEOTRC SAMPNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "dimensionless";
}
DATE {
Int32 _FillValue 2147483647;
Int32 actual_range 20131029, 20131216;
String bcodmo_name "date";
String description "Station Date (GMT) in the format YYYYMMDD";
String long_name "DATE";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String units "unitless";
}
time2 {
String bcodmo_name "time";
String description "Station Time (GMT)";
String long_name "TIME";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "HHMM";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.35434916e+9, 1.35688614e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date/Time (ISO formatted)";
String ioos_category "Time";
String long_name "ISO DATETIME";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DATETIME";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00.00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range -15.99569, -10.21911;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Station Latitude (South is negative)";
String ioos_category "Location";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -152.11975, -77.4525;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Station Longitude (West is negative)";
String ioos_category "Location";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "degrees_east";
}
NO3 {
Float32 _FillValue NaN;
Float32 actual_range -999.0, 15.26;
String bcodmo_name "NO3";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "NO3";
String long_name "Mole Concentration Of Nitrate In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/NTRAIGGS/";
String units "umol/L";
}
PO4 {
Float32 _FillValue NaN;
Float32 actual_range -999.0, 1.55;
String bcodmo_name "PO4";
String description "PO4";
String long_name "Mass Concentration Of Phosphate In Sea Water";
String units "umol/L";
}
SIL {
Float32 _FillValue NaN;
Float32 actual_range -999.0, 7.5;
String bcodmo_name "SiO4";
String description "SILICATE";
String long_name "SIL";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/SLCAAAZX/";
String units "umol/L";
}
NO2 {
Float32 _FillValue NaN;
Float32 actual_range -999.0, 0.61;
String bcodmo_name "NO2";
Float64 colorBarMaximum 1.0;
Float64 colorBarMinimum 0.0;
String description "NO2";
String long_name "Mole Concentration Of Nitrite In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/NTRIAAZX/";
String units "umol/L";
}
Salinity {
Float32 _FillValue NaN;
Float32 actual_range 34.95933, 36.1253;
String bcodmo_name "sal_bottle";
Float64 colorBarMaximum 37.0;
Float64 colorBarMinimum 32.0;
String description "Salinity";
String long_name "Sea Water Practical Salinity";
String units "PSS-78";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Methodology\\u00a0(extracted from the\\u00a0TN303 cruise report):
Salinity and nutrient samples were taken from the surface fish and from
Niskins attached to the wire at each Deep and Mid McLane pump cast.
Nutrient analyses (phosphate, silicate, nitrate+nitrite, nitrite) were
performed on a Seal Analytical continuous-flow AutoAnalyzer 3 (AA3). The
analytical methods used are described by Gordon et al., Hager et al., and
Atlas et al.
Silicate:\\u00a0Silicate was analyzed using the technique of Kirkwood et
al.\\u00a0An acidic solution of ammonium molybdate was added to a seawater
sample to produce silicomolybdic acid, which was then reduced to a
silicomolybdenum blue complex following the addition of ascorbic acid. Oxalic
acid was also added to impede PO4 color development. The sample was passed
through a flowcell and the absorbance measured at 660nm.
Nitrate + Nitrite:\\u00a0A modification of Armstrong et al. procedure was used
for the analysis of nitrate and nitrite. For the nitrate analysis, the
seawater sample was passed through a cadmium reduction column where nitrate
was quantitatively reduced to nitrite. Sulfanilamide was introduced to the
sample stream followed by N-(1-naphthyl)ethylenediamine dihydrochloride which
coupled to form a red azo dye. The stream was then passed through a flowcell
and the absorbance measured at 520nm. The same technique was employed for
nitrite analysis, except the cadmium column was not present.
Phosphate:\\u00a0Phosphate was analyzed using the Murphy and Riley technique.
An acidic solution of ammonium molybdate and antimony potassium tartrate was
added to the sample to produce phosphomolybdic acid, then reduced to
phosphomolybdous acid (a blue compound) following the addition of ascorbic
acid. The reaction product was heated to ~37 degrees C to enhance color
development, then passed through a flowcell and the absorbance measured at
880nm.
Salinity:\\u00a0A single Guildline Autosal 8400B salinometer (S/N 69-180)
located in the hydro lab was used for all salinity measurements. Samples were
analyzed after they had equilibrated to laboratory temperature, usually within
12-29 hours after collection. The salinometer was standardized for each group
of analyses, 36 to 72 samples, using two fresh vials of standard seawater per
group.Normal standardization procedures included flushing the cell at least 2
times with a fresh vial of IAPSO Standard Seawater (SSW, Batch P-155), setting
the flow rate as low as possible during the last fill, and monitoring the STD
dial setting. Samples were run using 2 flushes before the final fill. The
computer determined the stability of a measurement and prompted for additional
readings if there appeared to be drift. Salinity samples were drawn into 200
ml Kimax high-alumina borosilicate bottles, which were rinsed three times with
the sample prior to filling. The bottles were sealed with custom-made plastic
insert thimbles and kept closed with Nalgene screw caps.\\u00a0PSS-78 salinity
[UNES81] was calculated for each sample from the measured conductivity ratios.
The difference between the initial vial of standard water and the next one run
as an unknown was applied as a linear function of elapsed run time to the
measured ratios. The corrected salinity data were then incorporated into the
cruise database. Data processing included double checking that the station,
sample and box number had been correctly assigned, and reviewing the data and
log files for operator comments. The salinity data were compared to CTD
salinities and were used for shipboard sensor calibration.";
String awards_0_award_nid "502593";
String awards_0_award_number "OCE-1235248";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1235248&HistoricalAwards=false";
String awards_0_funder_name "NSF Division of Ocean Sciences";
String awards_0_funding_acronym "NSF OCE";
String awards_0_funding_source_nid "355";
String awards_0_program_manager "Donald L. Rice";
String awards_0_program_manager_nid "51467";
String awards_1_award_nid "502594";
String awards_1_award_number "OCE-1130870";
String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1130870&HistoricalAwards=false";
String awards_1_funder_name "NSF Division of Ocean Sciences";
String awards_1_funding_acronym "NSF OCE";
String awards_1_funding_source_nid "355";
String awards_1_program_manager "Henrietta N Edmonds";
String awards_1_program_manager_nid "51517";
String cdm_data_type "Other";
String comment
"GEOTRACES EPZT GT13 TN303
Surface FISH Nutrients and Salinities (for each station)\t\t\t\t\t\t\t\t\t\t\t\t\t
PIs: Moffett, et al
Version: 30 October 2014
(Nutrient values are reported in umol/L units; Salinity is PSS-78)";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_type "institution";
String creator_url "https://www.bco-dmo.org/";
String data_source "extract_data_as_tsv version 2.3 19 Dec 2019";
String date_created "2014-08-13T15:34:46Z";
String date_modified "2020-04-16T20:28:41Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.522822.1";
Float64 Easternmost_Easting -77.4525;
Float64 geospatial_lat_max -10.21911;
Float64 geospatial_lat_min -15.99569;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -77.4525;
Float64 geospatial_lon_min -152.11975;
String geospatial_lon_units "degrees_east";
String history
"2024-11-21T08:37:17Z (local files)
2024-11-21T08:37:17Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_522822.html";
String infoUrl "https://www.bco-dmo.org/dataset/522822";
String institution "BCO-DMO";
String instruments_0_acronym "GeoFish";
String instruments_0_dataset_instrument_nid "682725";
String instruments_0_description "The GeoFish towed sampler is a custom designed near surface (";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/31/";
String instruments_0_instrument_name "GeoFish Towed near-Surface Sampler";
String instruments_0_instrument_nid "549";
String keywords "bco, bco-dmo, biological, chemical, chemistry, concentration, data, dataset, date, datetime, density, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, Earth Science > Oceans > Ocean Chemistry > Phosphate, Earth Science > Oceans > Salinity/Density > Salinity, erddap, eventno, expocode, geotrc, GEOTRC_EVENTNO, GEOTRC_SAMPNO, iso, latitude, longitude, management, mass, mass_concentration_of_phosphate_in_sea_water, mole, mole_concentration_of_nitrate_in_sea_water, mole_concentration_of_nitrite_in_sea_water, n02, nitrate, nitrite, NO2, no3, ocean, oceanography, oceans, office, phosphate, po4, practical, preliminary, salinity, sampno, science, sea, sea_water_practical_salinity, seawater, sect, SECT_ID, sil, station, time, time2, water";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/522822/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/522822";
Float64 Northernmost_Northing -10.21911;
String param_mapping "{'522822': {'LATITUDE': 'flag - latitude', 'ISO_DATETIME': 'flag - time', 'LONGITUDE': 'flag - longitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/522822/parameters";
String people_0_affiliation "University of Southern California";
String people_0_affiliation_acronym "USC-HIMS";
String people_0_person_name "James W. Moffett";
String people_0_person_nid "50800";
String people_0_role "Lead Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Old Dominion University";
String people_1_affiliation_acronym "ODU";
String people_1_person_name "Gregory Cutter";
String people_1_person_nid "50679";
String people_1_role "Co-Principal Investigator";
String people_1_role_type "originator";
String people_2_affiliation "Woods Hole Oceanographic Institution";
String people_2_affiliation_acronym "WHOI";
String people_2_person_name "Christopher R. German";
String people_2_person_nid "51700";
String people_2_role "Co-Principal Investigator";
String people_2_role_type "originator";
String people_3_affiliation "University of Southern California";
String people_3_affiliation_acronym "USC-HIMS";
String people_3_person_name "James W. Moffett";
String people_3_person_nid "50800";
String people_3_role "Contact";
String people_3_role_type "related";
String people_4_affiliation "Woods Hole Oceanographic Institution";
String people_4_affiliation_acronym "WHOI BCO-DMO";
String people_4_person_name "Stephen R. Gegg";
String people_4_person_nid "50910";
String people_4_role "BCO-DMO Data Manager";
String people_4_role_type "related";
String project "U.S. GEOTRACES EPZT";
String projects_0_acronym "U.S. GEOTRACES EPZT";
String projects_0_description
"From the NSF Award Abstract
The mission of the International GEOTRACES Program (www.geotraces.org), of which the U.S. chemical oceanography research community is a founding member, is \"to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions\" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition.
This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES Intercalibration protocols; (5) prepare and deliver all hydrographic-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication.
Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program.
Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]";
String projects_0_end_date "2015-06";
String projects_0_geolocation "Eastern Tropical Pacific - Transect from Peru to Tahiti";
String projects_0_name "U.S. GEOTRACES East Pacific Zonal Transect";
String projects_0_project_nid "499723";
String projects_0_project_website "https://www.geotraces.org/";
String projects_0_start_date "2012-06";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -15.99569;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "EXPOCODE,SECT_ID";
String summary "GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.";
String time_coverage_end "2012-12-30T16:49:00.00Z";
String time_coverage_start "2012-12-01T08:06:00.00Z";
String title "[GP16 GeoFish - Nuts and Sals] - GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)";
String version "1";
Float64 Westernmost_Easting -152.11975;
String xml_source "osprey2erddap.update_xml() v1.3";
}
}
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.