{"@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/1360004229807527808.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/2017gc006854"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017GC006854"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GC006854"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Multidecadal oceanographic changes in the western <scp>P</scp>acific detected through high‐resolution bomb‐derived radiocarbon measurements on corals"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>High‐resolution measurements of radiocarbon (<jats:sup>14</jats:sup>C) in corals can be used to reconstruct past variability in ocean conditions. Here we report seasonal Δ<jats:sup>14</jats:sup>C changes in coral from Ishigaki Island, Japan, and compare with previously reported data from Palau and Guam. Our data clearly indicate a significant increase in Δ<jats:sup>14</jats:sup>C from 1947 to 1998 related to atmospheric nuclear bomb testing. The three early Δ<jats:sup>14</jats:sup>C spikes related to the atmospheric nuclear bomb tests in the US Proving Grounds at Bikini and Enewerak atoll conducted in 1954, 1956, and 1958 were detected from the Ishigaki coral. After 1976, variability in the Mindanao Dome region related to North Equatorial Current (NEC) bifurcation latitude migration affected the Δ<jats:sup>14</jats:sup>C difference between Palau and Guam, whereas the difference between Ishigaki and Guam was not correlated with the bifurcation latitude. The Δ<jats:sup>14</jats:sup>C difference between Ishigaki and Guam may be due to mesoscale eddies in the Kuroshio area. On the decadal scale, the northward shift of NEC bifurcation latitude after 1976, the year as known as Pacific Decadal Oscillation regime shift from negative to positive, was concurrent with the abundant westward‐propagating mesoscale eddies in the Subtropical Countercurrent region and stronger Kuroshio transport off the east Taiwan, which may be represented by a smaller Δ<jats:sup>14</jats:sup>C difference between Ishigaki and Guam after 1976.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004229807527812","@type":"Researcher","foaf:name":[{"@value":"S. Hirabayashi"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute, University of Tokyo Kashiwa Japan"},{"@value":"Department of Earth and Planetary Science, Graduate School of Science University of Tokyo Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229807527811","@type":"Researcher","foaf:name":[{"@value":"Y. Yokoyama"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute, University of Tokyo Kashiwa Japan"},{"@value":"Department of Earth and Planetary Science, Graduate School of Science University of Tokyo Tokyo Japan"},{"@value":"Department of Biogeochemistry Japan Agency for Marine‐Earth Science and Technology Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229807527173","@type":"Researcher","foaf:name":[{"@value":"A. Suzuki"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology Tsukuba Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229807527808","@type":"Researcher","foaf:name":[{"@value":"Y. Miyairi"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute, University of Tokyo Kashiwa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229807527174","@type":"Researcher","foaf:name":[{"@value":"T. Aze"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute, University of Tokyo Kashiwa Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"15252027"},{"@type":"EISSN","@value":"15252027"}],"prism:publicationName":[{"@value":"Geochemistry, Geophysics, Geosystems"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2017-04","prism:volume":"18","prism:number":"4","prism:startingPage":"1608","prism:endingPage":"1617"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017GC006854"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GC006854"}],"createdAt":"2017-04-04","modifiedAt":"2023-10-04","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781797800064","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"14J09489"},{"@type":"JGN","@value":"JP14J09489"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14J09489/"}],"notation":[{"@language":"ja","@value":"超微量放射性炭素測定法開発と微量金属測定による高時間分解能海洋環境復元"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781867343744","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15KK0151"},{"@type":"JGN","@value":"JP15KK0151"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15KK0151/"}],"notation":[{"@language":"ja","@value":"気候システムにおける氷床変動の役割の解明（国際共同研究強化）"},{"@language":"en","@value":"Understanding ice sheets dynamics and climate changes(Fostering Joint International Research)"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781954201984","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17H01168"},{"@type":"JGN","@value":"JP17H01168"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17H01168/"}],"notation":[{"@language":"ja","@value":"低緯度大気海洋結合度変化による急激な気候変調に関する研究"},{"@language":"en","@value":"A study on rapid climate and low latitude atmosphere and ocean coupling."}]},{"@id":"https://cir.nii.ac.jp/crid/1040000782493715200","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16H06309"},{"@type":"JGN","@value":"JP16H06309"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16H06309/"}],"notation":[{"@language":"ja","@value":"浅海底地形学を基にした沿岸域の先進的学際研究－三次元海底地形で開くパラダイム－"},{"@language":"en","@value":"Advanced Interdisciplinary Research on Coastal Areas based on Shallow Seafloor Geomorphology: Development of a Paradigm 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