{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361981470101743872.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2007pa001563"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2007PA001563"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2007PA001563"}}],"dc:title":[{"@value":"Evidence for a major change in silicon cycling in the subarctic North Pacific at 2.73 Ma"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>The initiation of Northern Hemisphere glaciation in the subarctic North Pacific at ∼2.73 Ma was marked by an abrupt cessation of high opaline accumulation, considered to result from an increased stratification of the water column that should have led to higher utilization of nutrients in the surface ocean. We present a new stable Si isotope‐based record of Si utilization that is hard to reconcile with this model. A drop in <jats:sup>30</jats:sup>Si/<jats:sup>28</jats:sup>Si by 0.4‰ at 2.73 Ma is coincident with an increase in bulk N isotope composition. The contrasting utilization records cannot have been both caused by a hydrographic change alone. Excluding a change in the Si:N export ratio, these results either imply a relative increase in silicic acid supplied to the surface waters or a change in its Si isotope composition. While it is impossible to distinguish between these two possibilities, both imply a regional or global change in the Si biogeochemical cycle, potentially caused by an enhanced storage of Si in the underlying deep waters of the Pacific.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380017280637923715","@type":"Researcher","foaf:name":[{"@value":"B. C. Reynolds"}],"jpcoar:affiliationName":[{"@value":"Institute of Isotope Geochemistry and Mineral Resources ETH Zurich  Zurich Switzerland"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981470101743874","@type":"Researcher","foaf:name":[{"@value":"M. Frank"}],"jpcoar:affiliationName":[{"@value":"Leibniz Institute of Marine Sciences at University of Kiel (IFM‐GEOMAR)  Kiel Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981470101743873","@type":"Researcher","foaf:name":[{"@value":"A. N. Halliday"}],"jpcoar:affiliationName":[{"@value":"Department of Earth Sciences Oxford University  Oxford UK"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"08838305"},{"@type":"EISSN","@value":"19449186"}],"prism:publicationName":[{"@value":"Paleoceanography"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2008-12","prism:volume":"23","prism:number":"4","prism:startingPage":"PA4219"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2007PA001563"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2007PA001563"}],"createdAt":"2008-12-26","modifiedAt":"2023-10-13","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050575520348994048","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Purification of Disc-Shaped Diatoms from the Southern Ocean Sediment by a Cell Sorter to Obtain an Accurate Oxygen Isotope Record"}]},{"@id":"https://cir.nii.ac.jp/crid/1050577541485178752","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A simple method for taxon-specific purification of diatom frustules from ocean sediments using a cell sorter"},{"@value":"A simple method for taxon-specific purifcation of diatom frustules from ocean sediments using a cell sorter"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285707150196608","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Millennial-scale changes of surface and bottom water conditions in the northwestern Pacific during the last deglaciation"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848657031284864","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Late Pliocene to early Pleistocene (2.4–1.25 Ma) paleoproductivity changes in the Bering Sea: IODP expedition 323 Hole U1343E"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679531172736","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Estimate of glacial silicic acid reduction over the last 600 ka in the Bering Sea using δ<sup>30</sup>Si of diatom frustules"},{"@value":"Estimate of glacial silicic acid reduction over the last 600 ka in the Bering Sea using δ³⁰Si of diatom frustules"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2007pa001563"},{"@type":"CROSSREF","@value":"10.1186/s40645-023-00543-5_references_DOI_M3I2eYb4WGGGZGqwgPURwexF67Y"},{"@type":"CROSSREF","@value":"10.1021/acsearthspacechem.1c00201_references_DOI_M3I2eYb4WGGGZGqwgPURwexF67Y"},{"@type":"CROSSREF","@value":"10.1016/j.dsr2.2015.04.003_references_DOI_M3I2eYb4WGGGZGqwgPURwexF67Y"},{"@type":"CROSSREF","@value":"10.2343/geochemj.2.0474_references_DOI_M3I2eYb4WGGGZGqwgPURwexF67Y"},{"@type":"CROSSREF","@value":"10.1016/j.gloplacha.2017.04.009_references_DOI_M3I2eYb4WGGGZGqwgPURwexF67Y"}]}