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| Dataset Title: | [GP16 Polonium-210 and Lead-210 dissolved] - Dissolved Po-210 and Pb-210 from GEOTRACES-EZPT cruise TN303, 2013 (U.S. GEOTRACES East Pacific Zonal Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_641044) |
| Information: | Summary
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| FGDC
| ISO 19115
| Metadata
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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";
}
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 2091, 10434;
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 "unitless";
}
depth_PI {
Float32 _FillValue NaN;
Float32 actual_range 2.4, 5491.5;
String bcodmo_name "depth";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
String description "Depth as reported by PI";
String long_name "Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String standard_name "depth";
String units "meters";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 2.4, 5497.2;
String axis "Z";
String bcodmo_name "depth";
String description "CTD bottle firing depth. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
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";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range -14.9839, -10.5002;
String axis "Y";
String bcodmo_name "latitude";
String description "Latitude of bottle firing; north is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String ioos_category "Location";
String long_name "BTL 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 -152.0385, -77.8181;
String axis "X";
String bcodmo_name "longitude";
String description "Longitude of bottle firing; east is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String ioos_category "Location";
String long_name "BTL LON";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "degrees_east";
}
CASTNO {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 25;
String bcodmo_name "cast";
String description "Cast Number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "CASTNO";
String units "unitless";
}
GEOTRC_EVENTNO {
Int16 _FillValue 32767;
Int16 actual_range 4014, 4472;
String bcodmo_name "event";
String description "GEOTRACES Event Number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "GEOTRC EVENTNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "unitless";
}
SAMPNO {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 25;
String bcodmo_name "bottle";
String description "Sample number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "SAMPNO";
String units "unitless";
}
BTLNBR {
String bcodmo_name "bottle";
String description "Bottle number. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "BTLNBR";
String units "unitless";
}
BTLNBR_FLAG_W {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Bottle quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing data. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
String long_name "BTLNBR FLAG W";
String units "unitless";
}
ISO_DATETIME_UTC_START_EVENT {
String bcodmo_name "ISO_DateTime_UTC";
String description "ISO 8601:2004 standard date and time at start of event. Values were added from the intermediate US GEOTRACES master file (see Processing Description). in the format YYYY-MM-DDTHH:MM:SS[.xx]Z";
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";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.38304404e+9, 1.38732396e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "ISO 8601:2004 standard date and time of bottle firing. Values were added from the intermediate US GEOTRACES master file (see Processing Description).";
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";
}
vol_sample {
Float32 _FillValue NaN;
Float32 actual_range 5.12, 22.312;
String bcodmo_name "volume";
String description "Volume of sample";
String long_name "Vol Sample";
String units "kg";
}
Po_210_D_CONC_BOTTLE {
Float32 _FillValue NaN;
Float32 actual_range 1.54, 25.09;
String bcodmo_name "trace_metal_conc";
String description "Dissolved Po-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from CTD bottle sample";
String long_name "Po 210 D CONC BOTTLE";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "210Po dpm 100L-1";
}
Po_210_D_CONC_BOTTLE_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.22, 2.65;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Po 210 D CONC BOTTLE Sd";
String units "210Po dpm 100L-1";
}
Po_210_D_CONC_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 "WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat";
String long_name "Po 210 D CONC BOTTLE Flag";
String units "unitless";
}
Pb_210_D_CONC_BOTTLE {
Float32 _FillValue NaN;
Float32 actual_range 1.87, 39.82;
String bcodmo_name "trace_metal_conc";
String description "Dissolved Pb-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from CTD bottle sample";
String long_name "Pb 210 D CONC BOTTLE";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "210Pb dpm 100L-1";
}
Pb_210_D_CONC_BOTTLE_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.16, 1.53;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Pb 210 D CONC BOTTLE Sd";
String units "210Pb dpm 100L-1";
}
Pb_210_D_CONC_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 "WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat";
String long_name "Pb 210 D CONC BOTTLE Flag";
String units "unitless";
}
Po_210_Pb_210_D_RATIO_BOTTLE {
Float32 _FillValue NaN;
Float32 actual_range 0.28, 1.99;
String bcodmo_name "trace_metal_conc";
String description "Ratio of Po-210 to Pb-210";
String long_name "Po 210 Pb 210 D RATIO BOTTLE";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "unitless";
}
Po_210_Pb_210_D_RATIO_BOTTLE_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.05, 0.16;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Po 210 Pb 210 D RATIO BOTTLE Sd";
String units "unitless";
}
Po_210_D_CONC_FISH {
Float32 _FillValue NaN;
Float32 actual_range 2.55, 6.15;
String bcodmo_name "trace_metal_conc";
String description "Dissolved Po-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from GEO-FISH sample";
String long_name "Po 210 D CONC FISH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "210Po dpm 100L-1";
}
Po_210_D_CONC_FISH_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.47, 0.88;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Po 210 D CONC FISH Sd";
String units "210Po dpm 100L-1";
}
Po_210_D_CONC_FISH_flag {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat";
String long_name "Po 210 D CONC FISH Flag";
String units "unitless";
}
Pb_210_D_CONC_FISH {
Float32 _FillValue NaN;
Float32 actual_range 7.2, 14.44;
String bcodmo_name "trace_metal_conc";
String description "Dissolved Pb-210; dissolved: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from GEO-FISH sample";
String long_name "Pb 210 D CONC FISH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "210Pb dpm 100L-1";
}
Pb_210_D_CONC_FISH_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.29, 0.6;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Pb 210 D CONC FISH Sd";
String units "210Pb dpm 100L-1";
}
Pb_210_D_CONC_FISH_flag {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "WOCE quality flag: 2 = good; 3 = questionable; 4 = bad; 9 = missing dat";
String long_name "Pb 210 D CONC FISH Flag";
String units "unitless";
}
Po_210_Pb_210_D_RATIO_FISH {
Float32 _FillValue NaN;
Float32 actual_range 0.24, 0.59;
String bcodmo_name "trace_metal_conc";
String description "Ratio of Po-210 to Pb-210 from GEO-FISH sample";
String long_name "Po 210 Pb 210 D RATIO FISH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "unitless";
}
Po_210_Pb_210_D_RATIO_FISH_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.05, 0.08;
String bcodmo_name "trace_metal_sd";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Error as standard deviation";
String long_name "Po 210 Pb 210 D RATIO FISH Sd";
String units "unitless";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"The methodology is published in Church et al., (2012) and Baskaran et al.
(2013) as well as given in the Sampling and Sample-handling Protocols for
GEOTRACES Cruises (Cookbook).
Chemical Procedures for the analysis of dissolved Po-210 and Pb-210 may be
downloaded below under 'Supplemental Files'.
We have conducted a large number of blanks to obtain high-quality data. We
have also an archived water sample from the Atlantic and assessed the
activities of Po-210 and Pb-210 in a known sample. We have developed an Excel
Spreadsheet that includes all the corrections (both decay and in-growth)
needed to get accurate data.";
String awards_0_award_nid "641046";
String awards_0_award_number "OCE-1237059";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1237059";
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
"Dissolved Po-210 and Pb-210
GEOTRACES-EPZT 2013
Dissolved Po-210 and Pb-210 in six vertical profiles from super stations of EPZT of US GEOTRACES cruise RV\\Thompson TN303
M. Baskaran (Wayne State U)
version: 2016-06-13 (bottle and fish samples separated; parameter names revised)
replaces v: 2016-04-12";
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 "2016-03-18T15:41:05Z";
String date_modified "2020-03-30T20:02:55Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.641044.2";
Float64 Easternmost_Easting -77.8181;
Float64 geospatial_lat_max -10.5002;
Float64 geospatial_lat_min -14.9839;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -77.8181;
Float64 geospatial_lon_min -152.0385;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 5497.2;
Float64 geospatial_vertical_min 2.4;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-21T08:57:50Z (local files)
2024-11-21T08:57:50Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_641044.html";
String infoUrl "https://www.bco-dmo.org/dataset/641044";
String institution "BCO-DMO";
String instruments_0_acronym "GO-FLO";
String instruments_0_dataset_instrument_nid "641067";
String instruments_0_description "GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
String instruments_0_instrument_name "GO-FLO Bottle";
String instruments_0_instrument_nid "411";
String instruments_1_acronym "Niskin bottle";
String instruments_1_dataset_instrument_nid "641066";
String instruments_1_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_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/";
String instruments_1_instrument_name "Niskin bottle";
String instruments_1_instrument_nid "413";
String instruments_2_acronym "CTD SBE 911plus";
String instruments_2_dataset_instrument_nid "641065";
String instruments_2_description "The Sea-Bird SBE 911plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9plus and SBE 11plus is called a SBE 911plus. The SBE 9plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3plus and SBE 4). The SBE 9plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics";
String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/";
String instruments_2_instrument_name "CTD Sea-Bird SBE 911plus";
String instruments_2_instrument_nid "591";
String keywords "bco, bco-dmo, biological, bottle, btl, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, btlnbr, BTLNBR_FLAG_W, castno, chemical, conc, cruise, cruise_id, ctddepth, data, dataset, datetime, depth, depth_PI, dmo, erddap, event, eventno, fish, flag, geotrc, GEOTRC_EVENTNO, GEOTRC_SAMPNO, iso, management, oceanography, office, Pb_210_D_CONC_BOTTLE, Pb_210_D_CONC_BOTTLE_flag, Pb_210_D_CONC_BOTTLE_sd, Pb_210_D_CONC_FISH, Pb_210_D_CONC_FISH_flag, Pb_210_D_CONC_FISH_sd, Po_210_D_CONC_BOTTLE, Po_210_D_CONC_BOTTLE_flag, Po_210_D_CONC_BOTTLE_sd, Po_210_D_CONC_FISH, Po_210_D_CONC_FISH_flag, Po_210_D_CONC_FISH_sd, Po_210_Pb_210_D_RATIO_BOTTLE, Po_210_Pb_210_D_RATIO_BOTTLE_sd, Po_210_Pb_210_D_RATIO_FISH, Po_210_Pb_210_D_RATIO_FISH_sd, preliminary, ratio, sample, sampno, start, stnnbr, time, vol, vol_sample, w";
String license "https://www.bco-dmo.org/dataset/641044/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/641044";
Float64 Northernmost_Northing -10.5002;
String param_mapping "{'641044': {'CTDDEPTH': 'flag - depth', 'BTL_ISO_DATETIME_UTC': 'flag - time', 'BTL_LON': 'flag - longitude', 'BTL_LAT': 'flag - latitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/641044/parameters";
String people_0_affiliation "Wayne State University";
String people_0_affiliation_acronym "WSU";
String people_0_person_name "Mark Baskaran";
String people_0_person_nid "51673";
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 "Nancy Copley";
String people_1_person_nid "50396";
String people_1_role "BCO-DMO Data Manager";
String people_1_role_type "related";
String project "U.S. GEOTRACES EPZT,GEOTRACES EPZT Po Pb";
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 "GEOTRACES EPZT Po Pb";
String projects_1_description
"Extracted from the NSF award abstract
In 2013, a multi-institutional team of U.S. marine chemists and geochemists will launch a major expedition to the Pacific Ocean to map and study the distribution of trace elements and isotopes as part of the International GEOTRACES Program. Because of their proven value as natural tracers of both sedimentation dynamics and hydrodynamics in the sea, radioactive daughter isotopes in the natural U-Th radionuclide series will be of immense value to all GEOTRACES researchers. In particular the naturally-occurring Pb210/Po210 radioisotope pair would be useful for quantifying rates of particulate scavenging of other trace elements and isotopes of interest in the U.S.GEOTRACES Pacific campaign. This is because these two isotopes are themselves particle-reactive and radioactive, thus providing a natural clock for tracking the vertical transport of other particle-reactive substances.
In this project, researchers at Wayne State University and CUNY Queens College will sample and analyze several hundred dissolved and particulate (large and small) samples for 210Po and 210Pb along the U.S.GEOTRACES Eastern South Pacific section. About two thirds of the samples will be focused at six so-called \"super stations\" (sites chosen for intensive study), half above the main thermocline and the other half down across the benthic nepheloid layer (the zone of suspended material extending several meters above the seafloor). The depths will be chosen according to regional atmospheric input, ecosystems, and coordinated with sampling by other researchers onboard. The other third will be taken within the hydrothermal plume in the vicinity of the East Pacific Rise. The data will be synthesized according to interface scavenging models by particle types (e.g. fine/colloidal, lithogenic and biogenic). As such, the proposed work will be closely coordinated with that of other U.S.GEOTRACES PIs funded to study other particle-reactive or dissolved trace elements and radionuclide isotopes during the campaign.
BROADER IMPACTS: The broader impacts are closely linked to those of the GEOTRACES Program as a whole: to enhance (1) research infrastructure by providing a broad array of 210Po and 210Pb data useful for biogeochemical scavenging models, (2) education by mentoring graduate and undergraduate students, teaching by example from proposed research, (3) participation of under-represented students interested in careers in the geosciences, (4) research training of graduates in marine radiochemistry, and 5) public dissemination of results through publications, presentations, and on a dedicated public website at Wayne State University.";
String projects_1_end_date "2017-08";
String projects_1_geolocation "Eastern South Pacific";
String projects_1_name "GEOTRACES - 210Po and 210Pb distribution at Eastern Pacific Interface Regimes";
String projects_1_project_nid "641047";
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 -14.9839;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "cruise_id,BTLNBR_FLAG_W";
String summary "Dissolved Po-210 and Pb-210 in six vertical profiles from super stations of EPZT of US GEOTRACES cruise on RV Thompson cruise 303. Dissolved Po-210 and Pb-210, dissolved: \\u2264 0.45 mm; units: disintegration per minute (dpm) / 100 L of water.";
String time_coverage_end "2013-12-17T23:46:00.00Z";
String time_coverage_start "2013-10-29T10:54:00.00Z";
String title "[GP16 Polonium-210 and Lead-210 dissolved] - Dissolved Po-210 and Pb-210 from GEOTRACES-EZPT cruise TN303, 2013 (U.S. GEOTRACES East Pacific Zonal Transect)";
String version "2";
Float64 Westernmost_Easting -152.0385;
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.