{"@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/1360011145954894592.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2005pa001147"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2005PA001147"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2005PA001147"}}],"dc:title":[{"@value":"Diatom δ<sup>18</sup>O evidence for the development of the modern halocline system in the subarctic northwest Pacific at the onset of major Northern Hemisphere glaciation"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Establishing a time frame for the development of the modern halocline and stratified water column in the subarctic North Pacific has significant paleoclimatic implications. Here we present a δ<jats:sup>18</jats:sup>O<jats:sub>(diatom)</jats:sub> record consisting of only two species that represents autumn/winter conditions in the region across the onset of major Northern Hemisphere glaciation boundary. At circa 2.73 Ma a decrease in δ<jats:sup>18</jats:sup>O<jats:sub>(diatom)</jats:sub> of 4.6‰ occurs, whereas previously published δ<jats:sup>18</jats:sup>O<jats:sub>(foram)</jats:sub> results show a 2.6‰ increase. The δ<jats:sup>18</jats:sup>O<jats:sub>(diatom)</jats:sub> and U<jats:sub>37</jats:sub><jats:sup>k</jats:sup> sea surface reconstructions indicate both a significant freshening of 2–4 practical salinity units and an increase in surface temperatures in the summer to early winter period from circa 2.73 Ma onward. In contrast, the concomitant increase in δ<jats:sup>18</jats:sup>O<jats:sub>(foram)</jats:sub> is likely to be reflective of conditions beneath the mesothermal structure and/or spring conditions when warmer sea surface temperatures are not present in the region. These results are consistent with the development of the modern halocline system at 2.73 Ma with year‐round stratification of the water column and a strengthened seasonal thermocline during the summer to early winter period, resulting in one of the largest summer to winter temperature gradients in the open ocean. The onset of stratification would also have led to a warm pool of surface water from circa 2.73 Ma, which may have provided a potential source of extra moisture needed to supply the growing North American ice sheets at this time.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380011145954894722","@type":"Researcher","foaf:name":[{"@value":"George E. A. Swann"}],"jpcoar:affiliationName":[{"@value":"Environmental Change Research Centre, Department of Geography University College London  London UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011145954894720","@type":"Researcher","foaf:name":[{"@value":"Mark A. Maslin"}],"jpcoar:affiliationName":[{"@value":"Environmental Change Research Centre, Department of Geography University College London  London UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011145954894593","@type":"Researcher","foaf:name":[{"@value":"Melanie J. Leng"}],"jpcoar:affiliationName":[{"@value":"NERC Isotope Geosciences Laboratory British Geological Survey  Nottingham UK"},{"@value":"School of Geography University of Nottingham  Nottingham UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011145954894592","@type":"Researcher","foaf:name":[{"@value":"Hilary J. Sloane"}],"jpcoar:affiliationName":[{"@value":"NERC Isotope Geosciences Laboratory British Geological Survey  Nottingham UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011145954894721","@type":"Researcher","foaf:name":[{"@value":"Gerald H. Haug"}],"jpcoar:affiliationName":[{"@value":"Geoforschungszentrum Potsdam  Potsdam Germany"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"08838305"},{"@type":"EISSN","@value":"19449186"}],"prism:publicationName":[{"@value":"Paleoceanography"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2006-02-24","prism:volume":"21","prism:number":"1","prism:startingPage":"PA1009"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2005PA001147"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2005PA001147"}],"createdAt":"2006-02-23","modifiedAt":"2023-10-12","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/1360294643719944320","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Evolution of (Bio‐)Geochemical Processes and Diagenetic Alteration of Sediments Along the Tectonic Migration of Ocean Floor in the Shikoku Basin off Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360846640867237632","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Inter-laboratory comparison of oxygen isotope compositions from biogenic silica"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679206497024","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Evolution of Large Scale Topography and Variation in Climate"},{"@language":"ja","@value":"大地形の変遷と気候変動"},{"@language":"ja-Kana","@value":"ダイチケイ ノ ヘンセン ト キコウ ヘンドウ"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2005pa001147"},{"@type":"CROSSREF","@value":"10.5026/jgeography.117.1015_references_DOI_OHWWrO5d52UMGar1QfCQNAA2zU5"},{"@type":"CROSSREF","@value":"10.1186/s40645-023-00543-5_references_DOI_OHWWrO5d52UMGar1QfCQNAA2zU5"},{"@type":"CROSSREF","@value":"10.1029/2020gc009585_references_DOI_OHWWrO5d52UMGar1QfCQNAA2zU5"},{"@type":"CROSSREF","@value":"10.1021/acsearthspacechem.1c00201_references_DOI_OHWWrO5d52UMGar1QfCQNAA2zU5"},{"@type":"CROSSREF","@value":"10.1016/j.gca.2011.08.011_references_DOI_OHWWrO5d52UMGar1QfCQNAA2zU5"}]}