Accessing BCO-DMO data
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| Dataset Title: | [Th-234 activity] - Water column Th-234 activity determined using a 4-L technique from samples collected on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project) (Costa Rica Dome FLUx and Zinc Experiments) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_516062) |
| Information: | Summary
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| FGDC
| ISO 19115
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Attributes {
s {
event {
Int16 _FillValue 32767;
Int16 actual_range 110, 1098;
String bcodmo_name "event";
String description "Number referring to the particular deployment activity (event) on the FluZiE cruise.";
String long_name "Event";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "integer";
}
cast {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 10, 84;
String bcodmo_name "cast";
String description "CTD Cast number from the FluZiE cruise.";
String long_name "Cast";
String units "integer";
}
cycle {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 5;
String bcodmo_name "unknown";
String description "Refers to the 4-day Lagrangian experiment during which the sample was taken.";
String long_name "Cycle";
String units "integer";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 1.75, 2002.25;
String axis "Z";
String bcodmo_name "depth";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
String description "Depth (in meters) that the sample was taken from as determined by CTD.";
String ioos_category "Location";
String long_name "Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
niskin {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 24;
String bcodmo_name "bot_Nis";
String description "Niskin bottle that the sample was taken from.";
String long_name "Niskin";
String units "integer";
}
sample {
String bcodmo_name "sample";
String description "Refers to a specific 234Th measurement.";
String long_name "Sample";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 8.37, 10.33;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude (in degrees North) where the sample was collected.";
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 -92.92, -86.76;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude (in degrees East) where the sample was collected.";
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";
}
sal {
Float32 _FillValue NaN;
Float32 actual_range 33.45, 34.94;
String bcodmo_name "sal";
String description "Salinity determined by CTD.";
String long_name "Sal";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/";
String units "practical salinity units (PSU)";
}
density {
Float32 _FillValue NaN;
Float32 actual_range 1021.17, 1036.98;
String bcodmo_name "density";
String description "Density determined by CTD.";
String long_name "Density";
String units "kilograms per cubic meter (kg m-3)";
}
U238_activity {
Float32 _FillValue NaN;
Float32 actual_range 2.31, 2.43;
String bcodmo_name "unknown";
String description "The activity of Uranium-238 (238U) estimated from salinity using the equation of Owens et al. (2011).";
String long_name "U238 Activity";
String units "decays per minute per liter (dpm L-1)";
}
Th234_activity {
Float32 _FillValue NaN;
Float32 actual_range 0.68, 3.22;
String bcodmo_name "thorium-234";
String description "The activity of Thorium-234 (234Th).";
String long_name "Th234 Activity";
String units "decays per minute per liter (dpm L-1)";
}
uncertainty {
Float32 _FillValue NaN;
Float32 actual_range 0.05, 0.58;
String bcodmo_name "unknown";
String description "The uncertainty in 234Th activity determined by propagating our measurement uncertainty.";
String long_name "Uncertainty";
String units "decays per minute per liter (dpm L-1)";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.277601029e+9, 1.279923204e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time (UTC) of CTD cast from which the water was drawn formatted to ISO 8601 standard. format: YYYY-mm-ddTHH:MM:SS.xx";
String ioos_category "Time";
String long_name "ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DateTime_UTC";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"4-L samples for analysis of water column 234Th concentrations were typically
taken at 12 depths spanning the upper 150 m on two casts per experimental
cycle. On two cycles in the core of the CRD, an additional set of 8 samples
was taken to assess 234Th deficiency down to 500-m depth. Samples were
analyzed by standard small volume procedures (Benitez-Nelson et al. 2001,
Buesseler et al. 2001, Pike et al. 2005). Immediately after collection,
samples were acidified to a pH < 2 with concentrated HNO3, spiked with 1 mL
230Th tracer (0.17 Bq mL-1), shaken vigorously, and allowed to equilibrate for
4-9 hours. Samples were then basified to a pH of 8-9 with NH4OH. 100 uL each
of KMnO4 (7.5 g L-1) and MnCl2 (33 g L-1) were added and samples were shaken
then allowed to sit for >8 hours as Th co-precipitated with manganese oxide.
Samples were then filtered at high pressure onto a quartz microfiber (QMA)
filter, dried in a drying oven, and mounted into RISO sample holders for beta
counting.
Samples were beta counted at the University of South Carolina on a RISO low-
level beta multi-counter within two months of the collection date. After an
additional 8 months, samples were recounted to determine background beta
emissions. Detector efficiency was calibrated using four samples taken from
2000-m depth (in water columns exceeding 3000-m depth), which were assumed to
be at equilibrium with respect to 234Th and 238U. After background counts
yield analyses were conducted as follows. Manganese oxide precipitate was
dissolved from filters in 10 mL 8M HNO3/10% H2O2. 1 mL of 229Th (1.66 Bq g-1)
tracer was then added gravimetrically, and the sample was sonicated for 20
minutes and allowed to sit for >6 hours. An aliquot of this solution was then
filtered through a 0.1-mm syringe filter and diluted with 2.2M HNO3/1%HF for
mass spec analysis of the 229:230Th tracer ratio at the Woods Hole
Oceanographic Institution Analytical Facility.";
String awards_0_award_nid "515386";
String awards_0_award_number "OCE-0826626";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=0826626";
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 "David L. Garrison";
String awards_0_program_manager_nid "50534";
String cdm_data_type "Other";
String comment
"Th-234 activity
PI: Michael Landry (UCSD-SIO)
Contact: Michael Stukel (UMCES)
Version: 28 May 2014";
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 "2014-05-28T20:07:40Z";
String date_modified "2019-12-11T19:31:49Z";
String defaultDataQuery "&time<now";
String doi "10.1575/1912/bco-dmo.516062.1";
Float64 Easternmost_Easting -86.76;
Float64 geospatial_lat_max 10.33;
Float64 geospatial_lat_min 8.37;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -86.76;
Float64 geospatial_lon_min -92.92;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 2002.25;
Float64 geospatial_vertical_min 1.75;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-12-31T10:59:22Z (local files)
2024-12-31T10:59:22Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_516062.html";
String infoUrl "https://www.bco-dmo.org/dataset/516062";
String institution "BCO-DMO";
String instruments_0_acronym "Mass Spec";
String instruments_0_dataset_instrument_description "Mass spec analysis of the 229:230Th tracer ratio took place at the Woods Hole Oceanographic Institution Analytical Facility.";
String instruments_0_dataset_instrument_nid "516066";
String instruments_0_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_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
String instruments_0_instrument_name "Mass Spectrometer";
String instruments_0_instrument_nid "685";
String instruments_0_supplied_name "Mass Spec";
String instruments_1_acronym "Riso Beta Counter";
String instruments_1_dataset_instrument_description "Samples were beta counted at the University of South Carolina on a RISO low-level beta multi-counter within two months of the collection date.";
String instruments_1_dataset_instrument_nid "516065";
String instruments_1_description
"Low-level beta detectors manufactured by Riso (now Nutech) in Denmark. These instruments accept samples that can be mounted on a 25mm filter holder. These detectors have very low backgrounds, 0.17 counts per minute, and can have counting efficiencies as high as 55%.
See:
http://cafethorium.whoi.edu/website/about/services_radioanalytical_facility_equip.html
and
http://www.nutech.dtu.dk/Produkter/Dosimetri/NUK_instruments/GM_multicounter.aspx";
String instruments_1_instrument_name "Riso Laboratory Anti-coincidence Beta Counters";
String instruments_1_instrument_nid "687";
String instruments_1_supplied_name "RISO low-level beta multi-counter";
String keywords "activity, altimetry, bco, bco-dmo, biological, cast, chemical, cycle, data, dataset, date, density, depth, dmo, erddap, event, iso, laboratory, latitude, longitude, management, niskin, oceanography, office, preliminary, sal, sample, satellite, th234, Th234_activity, time, u238, U238_activity, uncertainty";
String license "https://www.bco-dmo.org/dataset/516062/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/516062";
Float64 Northernmost_Northing 10.33;
String param_mapping "{'516062': {'lat': 'master - latitude', 'depth': 'flag - depth', 'lon': 'master - longitude', 'ISO_DateTime_UTC': 'master - time'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/516062/parameters";
String people_0_affiliation "University of California-San Diego";
String people_0_affiliation_acronym "UCSD-SIO";
String people_0_person_name "Michael R. Landry";
String people_0_person_nid "50545";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "University of Maryland Center for Environmental Science";
String people_1_affiliation_acronym "UMCES/HPL";
String people_1_person_name "Michael R Stukel";
String people_1_person_nid "515983";
String people_1_role "Contact";
String people_1_role_type "related";
String people_2_affiliation "Woods Hole Oceanographic Institution";
String people_2_affiliation_acronym "WHOI BCO-DMO";
String people_2_person_name "Shannon Rauch";
String people_2_person_nid "51498";
String people_2_role "BCO-DMO Data Manager";
String people_2_role_type "related";
String project "CRD FLUZiE";
String projects_0_acronym "CRD FLUZiE";
String projects_0_description
"Research was aimed at improved understanding of plankton dynamics, carbon and nutrient fluxes, and potential trace element limitation in the Costa Rica Dome region of the eastern tropical Pacific. The specific science objectives of the 2010 R/V Melville cruise (MV1008) were:
1) to assess grazing and trace metal/nutrient controls on primary production and phytoplankton standing stocks;
2) to quantify carbon and elemental fluxes and export rates from the euphotic zone; and
3) to measure microbial population, processes, stable isotope abundances associated with the OMZ and nitrite maxima.
Additional information about MV1008 can be found in the cruise report (PDF).
NOTE: The original proposal and award abstract are not relevant. The project was originally funded by NSF as experimental tests of phytoplankton controls in the Arabian Sea. Piracy concerns in the region led to the cancellation of the research cruise in 2009, and a Change of Scope request was approved to focus the project on related issues in the Costa Rica Dome (CRD).
Though this project is not formally affiliated with any large program, it aligns with IMBER's emphasis on community ecology and biogeochemistry, and the OCB focus on carbon-based measurements of production, grazing and export processes.";
String projects_0_end_date "2013-12";
String projects_0_geolocation "Costa Rica Dome, Eastern Tropical Pacific Ocean";
String projects_0_name "Costa Rica Dome FLUx and Zinc Experiments";
String projects_0_project_nid "515387";
String projects_0_start_date "2009-01";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 8.37;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Water column Thorium-234 and Uranium-238 measured on the MV1008 cruise in the Costa Rica Dome (CRD) region of the Eastern Tropical Pacific Ocean.";
String time_coverage_end "2010-07-23T22:13:24Z";
String time_coverage_start "2010-06-27T01:10:29Z";
String title "[Th-234 activity] - Water column Th-234 activity determined using a 4-L technique from samples collected on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project) (Costa Rica Dome FLUx and Zinc Experiments)";
String version "1";
Float64 Westernmost_Easting -92.92;
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.