{"@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/1360021391860682624.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2023pa004789"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023PA004789"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Evolution of Oceanography of the Central Northwest Pacific Over the Past 10 Million Years With Focus on Late Miocene Global Cooling"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Since the middle Miocene climatic transition, the Earth's climate has steadily cooled. The late Miocene global cooling (LMGC) and the Northern Hemisphere Glaciation (NHG) were two key cooling events occurring during this time. To better understand the mechanisms underlying these cooling events, changes in radiolarian microfossil assemblages were examined in this study, aiming at the reconstructing of oceanographic changes that have occurred at Ocean Drilling Program site 1208 during the last 10 million years. Sea surface temperatures (SSTs) were reconstructed based on radiolarian species that were extant 0–10 million years ago. Reconstructed SSTs were then compared with previously published alkenone‐based SSTs at site 1208, and it was found that overall, using SSTs based only on extant radiolarian species yielded a correct record for the last 10 million years. However, large discrepancies were observed between radiolarian‐ and alkenone‐based SSTs during LMGC and the NHG. These discrepancies were attributed to the sustained influence of subsurface water (at depths from ∼50 to 100 m) on assemblages of radiolarians during extreme cooling events. Relative abundances of other radiolarian groups indicated that during LMGC, there was a reorganization of the regional oceanography that probably weakened the Pacific meridional overturning circulation, increased the meridional temperature gradient, and caused a southward migration of the subtropical front. Probably, the North Pacific intermediate water expanded southeastward during NHG.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021391860682496","@type":"Researcher","foaf:name":[{"@value":"Kenji M. Matsuzaki"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute The University of Tokyo  Chiba Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"25724517"},{"@type":"EISSN","@value":"25724525"}],"prism:publicationName":[{"@value":"Paleoceanography and Paleoclimatology"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2023-12","prism:volume":"38","prism:number":"12"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://creativecommons.org/licenses/by/4.0/"],"url":[{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023PA004789"}],"createdAt":"2023-12-22","modifiedAt":"2024-01-20","project":[{"@id":"https://cir.nii.ac.jp/crid/1040014327094981248","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"23K03559"},{"@type":"JGN","@value":"JP23K03559"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23K03559/"}],"notation":[{"@language":"ja","@value":"現在より温暖な時期における対馬海流が日本海の古海洋と生態系に与えた影響"},{"@language":"en","@value":"Impact of the Tsushima Current on  the Sea of Japan paleooceanography and ecosystems in during climate phases warmer than today"}]},{"@id":"https://cir.nii.ac.jp/crid/1040285300660749056","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19KK0089"},{"@type":"JGN","@value":"JP19KK0089"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19KK0089/"}],"notation":[{"@language":"en","@value":"Evolution of the thermocline in the Indo Pacific Warm Pool during warmer climate phases of the late Neogene"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232101084672","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Millennial-scale variations of late Pleistocene radiolarian assemblages in the Bering Sea related to environments in shallow and deep waters"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232352976896","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Early to Middle Pleistocene paleoceanographic history of 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