{"@context":{"content":"http:\/\/purl.org\/rss\/1.0\/modules\/content\/","dc":"http:\/\/purl.org\/dc\/terms\/","foaf":"http:\/\/xmlns.com\/foaf\/0.1\/","og":"http:\/\/ogp.me\/ns#","rdfs":"http:\/\/www.w3.org\/2000\/01\/rdf-schema#","sioc":"http:\/\/rdfs.org\/sioc\/ns#","sioct":"http:\/\/rdfs.org\/sioc\/types#","skos":"http:\/\/www.w3.org\/2004\/02\/skos\/core#","xsd":"http:\/\/www.w3.org\/2001\/XMLSchema#","owl":"http:\/\/www.w3.org\/2002\/07\/owl#","rdf":"http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#","rss":"http:\/\/purl.org\/rss\/1.0\/","site":"https:\/\/www.bco-dmo.org\/ns#","odo":"http:\/\/ocean-data.org\/schema\/","emo":"http:\/\/ocean-data.org\/schema\/entity-matching#","bibo":"http:\/\/purl.org\/ontology\/bibo\/","crypto":"http:\/\/id.loc.gov\/vocabulary\/preservation\/cryptographicHashFunctions\/","bcodmo":"http:\/\/lod.bco-dmo.org\/id\/","tw":"http:\/\/tw.rpi.edu\/schema\/","dcat":"http:\/\/www.w3.org\/ns\/dcat#","time":"http:\/\/www.w3.org\/2006\/time#","geo":"http:\/\/www.w3.org\/2003\/01\/geo\/wgs84_pos#","geosparql":"http:\/\/www.opengis.net\/ont\/geosparql#","sf":"http:\/\/www.opengis.net\/ont\/sf#","void":"http:\/\/rdfs.org\/ns\/void#","sd":"http:\/\/www.w3.org\/ns\/sparql-service-description#","dctype":"http:\/\/purl.org\/dc\/dcmitype\/","prov":"http:\/\/www.w3.org\/ns\/prov#","schema":"http:\/\/schema.org\/","geolink":"http:\/\/schema.geolink.org\/1.0\/base\/main#","spdx":"http:\/\/spdx.org\/rdf\/terms#","bcodmo_vocab":"http:\/\/schema.bco-dmo.org\/"},"@id":"http:\/\/lod.bco-dmo.org\/id\/dataset\/825947#graph","@graph":[{"http:\/\/lod.bco-dmo.org\/id\/dataset\/825947":{"@id":"http:\/\/lod.bco-dmo.org\/id\/dataset\/825947","@type":["http:\/\/ocean-data.org\/schema\/DeploymentDatasetCollection","http:\/\/www.w3.org\/ns\/dcat#Dataset","http:\/\/ocean-data.org\/schema\/Dataset"],"http:\/\/ocean-data.org\/schema\/hasAcquisitionDescription":[{"@value":"
At sea, Radium-226 samples were collected following the GEOTRACES cookbook. Samples were collected from a 30-liter (L) Niskin mounted directly above a McLane large volume in situ pump WTS-LV (>1000 meters) or on a CTD Rosette (<1000 meters). These samples (10-25 L) were gravity-filtered through 15 grams (g) of manganese oxide impregnated acrylic fiber at approximately 0.5 liters per minute (L\/min). The filtrate was collected inside of a graduated rigid sided container and the volume was recorded. A mass was also obtained by using a hand-held digital balance.<\/p>\n
The Mn fibers from the Niskin bottles were rinsed with deionized water back at Woods Hole Oceanographic Institution (WHOI), partially dried, and sealed within a fiber holder after being flushed with helium equivalent to 30 column volumes. Samples were stored for a minimum of 12 days and analyzed for 226Ra via 222Rn ingrowth using alpha scintillation counting (Key et al., 1979). Samples were counted for 1-20 hours depending on the activity on the fiber, which resulted in counting uncertainties of ~2% dependent upon 226Ra content on the fiber and sample volume.<\/p>\n
Radium-228 was collected on manganese-coated cartridges filtered at depth using an adapted McLane in situ pump (WTS-LV). The pumps were programmed to filter 1500-2000L of seawater per deployment. The cartridges were rinsed with radium-free fresh water and excess moisture was removed using compressed air. Samples were analyzed multiple times using a delayed coincidence counter (RaDeCC) for determination of radium-228 via thorium-228 ingrowth. At selected stations, samples were ashed in a muffle furnace at 820 degrees Celsius for 24 hours and the fiber ash was transferred to polystyrene vials, sealed with epoxy (to prevent 222Rn loss), and counted on high purity, well-type germanium detectors to measure 228Ra, using the lines of 228Ac (338 keV, 911 keV, and 969 keV).<\/p>\n
In addition to the water column samples, large volume surface samples were collected by pumping from a depth of 2 meters through a single Mn-cartridge accompanied by a 15-25-liter sample that was passed through a 15 g Mn-fiber column to retain radium-226.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Water column dissolved radium-226 and radium-228 from Leg 2 of PMT cruise","@language":"en-US"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GP15 Dissolved Radium-226 and Radium-228 Leg 2","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
Data Processing:<\/strong> Quality Flags:<\/strong> Quality flag definitions:<\/strong>
\nThe data were corrected for decay from the time of sampling. Data is originally calculated in disintegrations per minute per liter (dpm\/L) and is converted to milli-Becquerels per kilogram (mBq\/kg) using the standard ocean rho = 1.0235 kg\/L and 1 dpm = 16.667 mBq.<\/p>\n
\nData were flagged using the SeaDataNet quality flag scheme. Two additional flags, 'B' and 'C' (defined below), were also assigned to this dataset. For more information on SeaDataNet flags, see:\u00a0https:\/\/www.geotraces.org\/geotraces-quality-flag-policy\/<\/a>\u00a0and\u00a0https:\/\/www.seadatanet.org\/Standards\/Data-Quality-Control<\/a>.<\/p>\n
\n0 = No quality control;
\n1 = Good value;
\n2 = Probably good value;
\n3 = Probably bad value;
\n4 = Bad value;
\n5 = Changed value;
\n6 = Value below detection;
\n7 = Value in excess;
\n8 = Interpolated value;
\n9 = Missing value;
\nA = Value phenomenon uncertain;
\nB = Value obtained from Radium\/Barium ratio;
\nC = Value measured through gamma spectroscopy.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"825947","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"GP15 Dissolved Radium-226 and Radium-228 Leg 2"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2020-10-01T15:46:44-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2020-10-01T15:46:44-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-10-02T16:45:58-04:00","@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:825947","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/825947"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier825947"}],"http:\/\/ocean-data.org\/schema\/hasDataManagementProcessing":[{"@value":"*Version 1:*\r\nversion 1 date: 2020-10-01\r\n- renamed fields to comply with BCO-DMO naming conventions;\r\n- added date\/time columns in ISO 8601 format;\r\n- replaced \"N\/A\" with \"nd\" to indicate \"no data\".\r\n\r\n*Version 2:*\r\nversion 2 date: 2021-12-28 (v2) \r\n- - same as version 1, plus made the following corrections to the Event_ID column:\r\n- changed event number for Sample 14731 from 6882 to 6879;\r\n- changed event number for Samples 14883-14890 from 6828 to 6898;\r\n- changed event number for Sample 33 from 6943 to 6942.\r\n\r\n*Version 3:*\r\nversion 3 date: 2022-09-29\r\n- imported two Excel files, \"BCODMO GP15 Charette 226Radium leg2.xlsx\" and \"BCODMO GP15 Charette 228Radium leg2.xlsx\", into the BCO-DMO system;\r\n- joined the two files, using Event_ID and Sample_ID as they key, to create a single dataset;\r\n- renamed the 'Flag' field for Ra228 to follow GEOTRACES naming conventions;\r\n- renamed the Ra-228 fields using the parameter names assigned by the GEOTRACES DOoR portal;\r\n- saved the final file as \"825947_v3_gp15_ra226_ra228_leg2.csv\"\r\n- note that in the final csv file, missing data are blank\/empty.","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Water column dissolved radium-226 and radium-228 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R\/V Roger Revelle from October to November 2018","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"Water column dissolved radium-226 and radium-228 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R\/V Roger Revelle from October to November 2018. In this dataset version (v3), the radium-226 data have been updated from the previous version of the dataset.","@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":"_:temporalExtent825947"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage825947"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Charette, M. A., Moore, W. S. (2023) Water column dissolved radium-226 and radium-228 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R\/V Roger Revelle from October to November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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