{"@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/1361694368033826432.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2019jc015600"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2019JC015600"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2019JC015600"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2019JC015600"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JC015600"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Seasonal and Interannual Variations in Nitrogen Availability and Particle Export in the Northwestern North Pacific Subtropical Gyre"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Time series of particulate nitrogen isotope delta (PN‐<jats:italic>δ</jats:italic><jats:sup>15</jats:sup>N) and flux of trapped particles at 200 m were determined in the northwestern North Pacific subtropical gyre between 2010 and 2014 in order to examine temporal variations in mixed layer nitrate availability and downward particle export. Lower PN‐<jats:italic>δ</jats:italic><jats:sup>15</jats:sup>N (<4‰) seen every winter corresponded to convective nitrate supply triggering phytoplankton blooms. Greater particle fluxes were associated with higher CaCO<jats:sub>3</jats:sub> concentrations (mass fraction >50%), implying that new nitrogen supply stimulated predominantly coccolithophore growth and downward transport of coccoliths. Even in the stratified summer of 2011, a <jats:italic>δ</jats:italic><jats:sup>15</jats:sup>N drop associated with a spike in particulate flux was found and was attributed to the uplift of nitrate‐rich deep waters due to a mesoscale cyclonic eddy passing the mooring station. Total nitrate input sustains 86–93% of annual new production in this region while nitrogen fixation accounts for the rest. Trapped particles also showed that the winter <jats:italic>δ</jats:italic><jats:sup>15</jats:sup>N decrease appeared earlier in the 2011–2012 blooms than those in 2013–2014, coinciding with 8% higher CaCO<jats:sub>3</jats:sub> concentrations and a 40% lower particulate organic carbon to inorganic carbon export ratio, <jats:italic>R</jats:italic>(POC:PIC). This reflected stronger convective mixing and hence larger nutrient supply in 2011–2012, caused by larger ocean heat loss related to winter monsoon intensity. Such interannual change of winter <jats:italic>R</jats:italic>(POC:PIC) can affect CO<jats:sub>2</jats:sub> uptake rate in the northwestern North Pacific subtropical gyre where anthropogenic CO<jats:sub>2</jats:sub> accumulates in subtropical mode waters.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380861286399874944","@type":"Researcher","foaf:name":[{"@value":"Y. Mino"}],"jpcoar:affiliationName":[{"@value":"Institute for Space‐Earth Environmental Research Nagoya University  Nagoya Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826305","@type":"Researcher","foaf:name":[{"@value":"C. Sukigara"}],"jpcoar:affiliationName":[{"@value":"Center for Marine Research and Operations Tokyo University of Marine Science and Technology  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826309","@type":"Researcher","foaf:name":[{"@value":"M. C. Honda"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033825920","@type":"Researcher","foaf:name":[{"@value":"H. Kawakami"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033825921","@type":"Researcher","foaf:name":[{"@value":"M. Wakita"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826434","@type":"Researcher","foaf:name":[{"@value":"K. Sasaoka"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826048","@type":"Researcher","foaf:name":[{"@value":"C. Yoshikawa"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826178","@type":"Researcher","foaf:name":[{"@value":"O. Abe"}],"jpcoar:affiliationName":[{"@value":"Graduate School of Environmental Studies Nagoya University  Nagoya Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826049","@type":"Researcher","foaf:name":[{"@value":"J. Kaiser"}],"jpcoar:affiliationName":[{"@value":"Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences University of East Anglia  Norwich UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826050","@type":"Researcher","foaf:name":[{"@value":"K. Kimoto"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826179","@type":"Researcher","foaf:name":[{"@value":"M. Kitamura"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826051","@type":"Researcher","foaf:name":[{"@value":"T. Fujiki"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826308","@type":"Researcher","foaf:name":[{"@value":"K. Matsumoto"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381694368033826176","@type":"Researcher","foaf:name":[{"@value":"T. Saino"}],"jpcoar:affiliationName":[{"@value":"Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"},{"@value":"Deceased April 17, 2014"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699275"},{"@type":"EISSN","@value":"21699291"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Oceans"}],"dc:publisher":[{"@value":"American Geophysical Union 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