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Particulate material was collected using in situ McLane pumps (also see data from Charette and Lam groups). All data were decay corrected back to the mid-pump times.<\/p>\n
1-51 um Th-234<\/strong> >51 um Th-234<\/strong> Particulate Th-234 from in situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from the 2010 and 2011 U.S. GEOTRACES cruises.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GT10-11 - Th234 Particulate","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":" Data were flagged with quality indicators: 1 = Good; 2 = Questionable; 3 = Bad.<\/p>\n BCO-DMO made the following modifications: Additional GEOTRACES Processing:<\/strong> Bottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.<\/p>\n A standardized BCO-DMO method (called \"join\") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.<\/p>\n If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.<\/p>\n See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"3835","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"GT10-11 - Th234 Particulate"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2013-01-03T15:02:28-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2013-01-03T15:02:28-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:3835","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/3835"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier3835"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Particulate Thorium-234 from in situ pumps from R\/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"Particulate Th-234 from in situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from the 2010 and 2011 U.S. GEOTRACES cruises.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent3835"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage3835"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Buesseler, K. (2020) Particulate Thorium-234 from in situ pumps from R\/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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\nOn KN199-4, the mesh screens were cut in half and the material from one half was rinsed onto a silver filter and dried down. On KN 204-01a and KN 204-01b, the whole mesh screen was rinsed onto a silver filter and dried down. The mean volume pumped through the whole Supor mesh screens was 475 L.<\/p>\n
\nWhole QMAs, located below a mesh screen in the filter head housing, were oven-dried upon recovery. A 25 mm subsample was taken from this whole filter for beta counting for Th-234. The mean effective volume for the 25 mm QMA subsample was 47 L.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Particulate Thorium-234 from in situ pumps.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
\n- Parameter names have been modified to conform with BCO-DMO naming conventions.
\n- 'NaN' was replaced with 'nd' to indicate 'no data'.
\n- cruise_part was separated from the official cruise ID for cruise KN204-01.
\n- Added ISO_DateTime_UTC from the original date and time fields provided for each cast\/event.<\/p>\n
\nAfter the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.<\/p>\n