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Total \u00b2\u00b3\u2074Th was measured in samples of seawater collected at discrete depths using Niskin bottles as described in Umhau et al. (2019). Briefly, 2 L of seawater was collected at each selected depth. Samples were spiked with \u00b2\u00b3\u2070Th as a yield tracer and acidified to pH ~ 1 using concentrated nitric acid. After equilibration, ~ 6 hours later, KMnO\u2084 and MnCl\u2082 were added and the pH adjusted to ~ 9 with concentrated NH\u2084OH in order to co-precipitate Th via the formation of MnO\u2082. After eight hours, total \u00b2\u00b3\u2074Th samples were filtered onto 25 mm QMA filters, air dried, and frozen.<\/p>\n
The \u00b2\u00b3\u2074Th flux (dpm m\u207b\u00b2 d\u207b\u00b9) was calculated from the \u00b2\u00b3\u2074Th:\u00b2\u00b3\u2078U disequilibrium and assuming a steady state (Umhau et al. 2019). The \u00b2\u00b3\u2074Th flux at each depth was obtained by integrating the flux for the overlying depths using trapezoidal integration.<\/p>\n
Thorium counts were made using a low level RISO beta counter within 2 weeks of sample collection.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"234Th flux in epipelagic waters of Station Aloha and the Equatorial North Pacific","@language":"en-US"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"234Th Flux","@type":"xsd:string"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"806471","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"234Th Flux"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2020-03-19T10:25:49-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2020-03-19T10:25:49-04:00","@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:806471","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/806471"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier806471"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R\/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R\/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015.","@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":"_:temporalExtent806471"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage806471"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Benitez-Nelson, C., Drazen, J., Popp, B. 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