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| Dataset Title: | [GP16 d13C-DIC] - The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_676537) |
| Information: | Summary
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| ISO 19115
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "Cruise identification";
String long_name "Cruise Id";
String units "unitless";
}
EXPOCODE {
String bcodmo_name "EXPOCODE";
String description "Cruise EXPO code.";
String long_name "EXPOCODE";
String units "unitless";
}
GEOTRC_INSTR {
String bcodmo_name "instrument";
String description "Sampling instrument; added from BCO-DMO EPZT master events file.";
String long_name "GEOTRC INSTR";
String units "unitless";
}
STNNBR {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 36;
String bcodmo_name "station";
String description "Station number";
String long_name "STNNBR";
String units "unitless";
}
GEOTRC_SAMPNO {
Int16 _FillValue 32767;
Int16 actual_range 2071, 10453;
String bcodmo_name "sample";
String description "Unique GEOTRACES sample number";
String long_name "GEOTRC SAMPNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "unitless";
}
GEOTRC_EVENTNO {
Int16 _FillValue 32767;
Int16 actual_range 4012, 4474;
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 "unitless";
}
CASTNO {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 17;
String bcodmo_name "cast";
String description "Cast number";
String long_name "CASTNO";
String units "unitless";
}
DIC_13_D_DELTA_BOTTLE {
Float32 _FillValue NaN;
Float32 actual_range -0.51, 1.41;
String bcodmo_name "d13C_DIC";
String description "d13C-DIC; Carbon 13 to Carbon 12 ratio of DIC: 1000*[(13C/12C)sample - (13C/12C)standard]/ (13C/12C)standard. Reported in units of per mil.";
String long_name "DIC 13 D DELTA BOTTLE";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/D13CMIBX/";
String units "per mil";
}
DIC_13_D_DELTA_BOTTLE_FLAG {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 3;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for DIC_13_D_DELTA_BOTTLE. 2 = good data; 3 = questionable data; 9 = no data.";
String long_name "DIC 13 D DELTA BOTTLE FLAG";
String units "unitless";
}
SAMPNO {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 12;
String bcodmo_name "bottle";
String description "Sequential sample number within the cast (usually corresponds to bottle number).";
String long_name "SAMPNO";
String units "unitless";
}
BTLNBR {
String bcodmo_name "bottle";
String description "Bottle number; typically 1-24.";
String long_name "BTLNBR";
String units "unitless";
}
BTLNBR_FLAG_W {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Bottle number quality flag; follows WOCE conventions. 2 = good; 3 = questionable; 4 = bad; 9 = missing data.";
String long_name "BTLNBR FLAG W";
String units "unitless";
}
ISO_DATETIME_UTC_START_EVENT {
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time, formatted to the ISO 8601 standard, at the start of the sampling event, according to the event log. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z. Added from BCO-DMO EPZT master events file.";
String long_name "ISO DATETIME UTC START EVENT";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DATETIME_UTC_START_EVENT";
String time_precision "1970-01-01T00:00:00.00Z";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range -16.00067, -10.50017;
String axis "Y";
String bcodmo_name "latitude";
String description "Latitude at the start of the event; north is positive; added from BCO-DMO EPZT master events file.";
String ioos_category "Location";
String long_name "EVENT LAT";
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 -152.0005, -77.37617;
String axis "X";
String bcodmo_name "longitude";
String description "Longitude at the start of the event; east is positive; added from BCO-DMO EPZT master events file.";
String ioos_category "Location";
String long_name "EVENT LON";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "degrees_east";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.38301176e+9, 1.38734196e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time, formatted to the ISO 8601 standard, at the time of bottle firing. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z. Added from BCO-DMO EPZT master events file.";
String ioos_category "Time";
String long_name "BTL ISO DATETIME UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
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";
}
BTL_LAT {
Float32 _FillValue NaN;
Float32 actual_range -16.0006, -10.5002;
String bcodmo_name "latitude";
String description "Latitude of bottle firing; north is positive. Added from BCO-DMO EPZT master events file.";
String long_name "BTL LAT";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String units "decimal degrees";
}
BTL_LON {
Float32 _FillValue NaN;
Float32 actual_range -152.0006, -77.3761;
String bcodmo_name "longitude";
String description "Lonitude of bottle firing; east is positive. Added from BCO-DMO EPZT master events file.";
String long_name "BTL LON";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String units "decimal degrees";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 1.8, 5505.2;
String axis "Z";
String bcodmo_name "depth";
String description "CTD bottle firing depth obtained from the CTD bottle files; added from BCO-DMO EPZT master events file.";
String ioos_category "Location";
String long_name "CTDDEPTH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Shipboard Sample Collection Methods:\\u00a0Sampliing was done using\\u00a0the
ODF CTD rosette (12 30L Niskins). Samples were collected in pre-washed and
baked 250 ml ground glass stoppered bottles that were poisoned with 100 ul of
a saturated HgCl2 solution. The stored sealed samples were returned to the
Stable Isotope Laboratory at the University of Washington for extraction and
measurement.
Laboratory Methods:\\u00a0CO2 was extracted from the DIC seawater sample using
a modification of the helium stripping technique described in Quay and
Stutsman (2003). The del13C was\\u00a0measured on a Thermo Delta Plus XL mass
spectrometer.";
String awards_0_award_nid "674970";
String awards_0_award_number "OCE-1233005";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1233005";
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 "Henrietta N Edmonds";
String awards_0_program_manager_nid "51517";
String cdm_data_type "Other";
String comment
"d13C-DIC
GEOTRACES EPZT
PI: Paul D. Quay (University of Washington)
Version: 26 Jan 2017";
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 "2017-01-26T20:33:18Z";
String date_modified "2020-04-10T19:52:51Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.676537.1";
Float64 Easternmost_Easting -77.37617;
Float64 geospatial_lat_max -10.50017;
Float64 geospatial_lat_min -16.00067;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -77.37617;
Float64 geospatial_lon_min -152.0005;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 5505.2;
Float64 geospatial_vertical_min 1.8;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-21T08:37:17Z (local files)
2024-11-21T08:37:17Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_676537.html";
String infoUrl "https://www.bco-dmo.org/dataset/676537";
String institution "BCO-DMO";
String instruments_0_acronym "Niskin bottle";
String instruments_0_dataset_instrument_description "Samples were collected by the ODF CTD rosette (12 30L Niskins).";
String instruments_0_dataset_instrument_nid "676550";
String instruments_0_description "A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/";
String instruments_0_instrument_name "Niskin bottle";
String instruments_0_instrument_nid "413";
String instruments_1_acronym "Mass Spec";
String instruments_1_dataset_instrument_description "The del13C is measured on a Thermo Delta Plus XL mass spectrometer.";
String instruments_1_dataset_instrument_nid "676551";
String instruments_1_description "General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
String instruments_1_instrument_name "Mass Spectrometer";
String instruments_1_instrument_nid "685";
String instruments_1_supplied_name "Thermo Delta Plus XL mass spectrometer";
String keywords "bco, bco-dmo, biological, bottle, btl, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, btlnbr, BTLNBR_FLAG_W, castno, chemical, cruise, cruise_id, ctddepth, data, dataset, datetime, delta, dic, DIC_13_D_DELTA_BOTTLE, DIC_13_D_DELTA_BOTTLE_FLAG, dmo, erddap, event, EVENT_LAT, EVENT_LON, eventno, expocode, flag, geotrc, GEOTRC_EVENTNO, GEOTRC_INSTR, GEOTRC_SAMPNO, instr, iso, management, oceanography, office, preliminary, sampno, start, stnnbr, time, w";
String license "https://www.bco-dmo.org/dataset/676537/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/676537";
Float64 Northernmost_Northing -10.50017;
String param_mapping "{'676537': {'BTL_ISO_DATETIME_UTC': 'flag - time', 'CTDDEPTH': 'flag - depth', 'EVENT_LAT': 'flag - latitude', 'EVENT_LON': 'flag - longitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/676537/parameters";
String people_0_affiliation "University of Washington";
String people_0_affiliation_acronym "UW";
String people_0_person_name "Paul Quay";
String people_0_person_nid "50590";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Woods Hole Oceanographic Institution";
String people_1_affiliation_acronym "WHOI BCO-DMO";
String people_1_person_name "Shannon Rauch";
String people_1_person_nid "51498";
String people_1_role "BCO-DMO Data Manager";
String people_1_role_type "related";
String project "U.S. GEOTRACES EPZT,EPZT d13C-DIC";
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 projects_1_acronym "EPZT d13C-DIC";
String projects_1_description
"Text from the NSF award abstract:
The international GEOTRACES program has two major goals: (1) to determine global ocean distributions of selected trace elements and isotopes and evaluate the sources, sinks, and internal cycling of these species to characterize more completely the physical, chemical and biological processes regulating their distributions; and (2) to understand the processes that control the concentrations of geochemical species used for proxies of the past environment. Because the cycling of trace elements and isotopes in the sea is intimately connected with both the organic and the inorganic biogeochemical transformations of carbon, the achievement of the goals of GEOTRACES would be very difficult if not impossible unless synoptic measurements are also made on the organic and inorganic marine carbon system.
In this project, researchers at the University of Washington will participate in the U.S.GEOTRACES Pacific campaign in 2013 to characterize the regional ocean carbon system. They will use two approaches. First, they will measure the depth distribution of the 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon (del13C), which has been designated in the international GEOTRACES Science Plan as a key parameter and has the highest measurement priority. Second, they will estimate the rate of organic matter (OM) export from the surface layer based on dissolved O2/Ar gas ratios. Measurements of del13C will be made at about 22 stations for a total of ~525 samples. Additionally, they will measure the dissolved O2/Ar gas ratio at ~5 km spatial resolution in the surface layer using an underway measurement method that has been used extensively in other oceanic regions.
The cruise track will cross a wide range of biological productivity regimes from the coastal upwelling zone off Peru to the oligotrophic gyre surrounding Tahiti. The proposed high resolution O2/Ar-based OM export rates should clearly detect the expected offshore decrease in OM export and locate transition zones or fronts in productivity. The expected large offshore productivity gradient will provide the opportunity to determine the impact of OM export from the surface layer and OM degradation at depth on upper ocean depth distribution of del13C, trace elements (TEs), O2 and nutrients along the section.
The initial del13C and TE measurements during GEOTRACES illustrate the potential to improve our understanding of the processes that control del13C, TEs and nutrient distributions in the modern ocean and, as a result, improve the utility of del13C and TEs as tracers of past changes in the ocean circulation and carbon cycling, which is a long term goal of this research.
Broader Impacts. The data and research results will be broadly distributed to the international oceanographic and paleoclimate communities and incorporated into the PI's graduate and undergraduate teaching curricula. Additionally, there will be active undergraduate participation (5 students currently) in preparing samples for del13C analyses.";
String projects_1_end_date "2016-08";
String projects_1_geolocation "Eastern Tropical Pacific";
String projects_1_name "US GEOTRACES Pacific: Measuring the d13C-DIC distribution and quantifying the impact of organic matter export on d13C, nutrients and trace metals";
String projects_1_project_nid "674971";
String projects_1_start_date "2012-09";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -16.00067;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "cruise_id,EXPOCODE,GEOTRC_INSTR,BTLNBR_FLAG_W";
String summary "The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013.";
String time_coverage_end "2013-12-18T04:46:00.00Z";
String time_coverage_start "2013-10-29T01:56:00.00Z";
String title "[GP16 d13C-DIC] - The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)";
String version "1";
Float64 Westernmost_Easting -152.0005;
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.