{"@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/1362544418499343360.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/s0967-0645(02)00197-2"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0967064502001972?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0967064502001972?httpAccept=text/plain"}},{"identifier":{"@type":"NAID","@value":"30007352333"}}],"dc:title":[{"@value":"Seasonal variations of carbon dioxide system and nutrients in the surface mixed layer at station KNOT (44°N, 155°E) in the subarctic western North Pacific"}],"description":[{"notation":[{"@value":"Abstract   Dissolved inorganic carbon (DIC) and related chemical species have been measured since June 1998 at the western subarctic time-series station KNOT (44°N, 155°E). Seasonal changes in hydrography, concentrations of nutrients and DIC, and total alkalinity (TAlk) were observed above the pycnocline, which exists at 150–300 m. DIC in the surface mixed layer showed a maximum in February 2000 (2093 μmol kg –1 ) and minima in August 1998 and 1999 (1980 and 1987 μmol kg –1 , respectively). The seasonal amplitude of DIC was 107 μmol kg –1  in the 1999–2000 time series, which is larger than those at other pelagic ocean time-series sites. This large variation is due mainly to biological production in spring to fall and strong vertical mixing in winter. Surface fugacity of CO 2  (fCO 2 ) ranged from 300 to 390 μatm in the 1999–2000 time series, generally decreasing in spring and summer and increasing in fall and winter. The seasonal change in fCO 2  was controlled mainly by the large variation in surface DIC. The invasion of atmospheric CO 2  into the surface seawater continues from June to January, showing a maximum in October. The decrease in carbon in summer was explained by biological uptake on the basis of Redfield stoichiometry and air–sea CO 2  exchange. Net community production in the surface mixed layer estimated from the change in nutrients ranged from 250 to 600 mg C m –2  day –1  and was higher in spring."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382544418499343361","@type":"Researcher","foaf:name":[{"@value":"Nobuo Tsurushima"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544418499343233","@type":"Researcher","foaf:name":[{"@value":"Yukihiro Nojiri"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544418499343232","@type":"Researcher","foaf:name":[{"@value":"Keiri Imai"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544418499343360","@type":"Researcher","foaf:name":[{"@value":"Shuichi Watanabe"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"09670645"}],"prism:publicationName":[{"@value":"Deep Sea Research Part II: Topical Studies in Oceanography"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2002-01","prism:volume":"49","prism:number":"24-25","prism:startingPage":"5377","prism:endingPage":"5394"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0967064502001972?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0967064502001972?httpAccept=text/plain"}],"createdAt":"2002-10-28","modifiedAt":"2020-03-11","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050025031476745216","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Biological data assimilation for parameter estimation of a phytoplankton functional type model for the western North Pacific"}]},{"@id":"https://cir.nii.ac.jp/crid/1050025031481843712","@type":"Article","resourceType":"学術雑誌論文(journal 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June"}]},{"@id":"https://cir.nii.ac.jp/crid/1523388080443993600","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Simultaneous Vertical Measurements of In Situ pH and CO2 in the Sea Using Spectrophotometric Profilers"},{"@language":"ja-Kana","@value":"Simultaneous Vertical Measurements of In Situ pH and CO2 in the Sea Using Spectrophotometric Profilers"}]},{"@id":"https://cir.nii.ac.jp/crid/1523388080618290944","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Export Production in the Subarctic North Pacific over the Last 800 kyrs: No Evidence for Iron Fertilization?"},{"@language":"ja-Kana","@value":"Export Production in the Subarctic North Pacific over the Last 800 kyrs No Evidence for Iron Fertilization"}]},{"@id":"https://cir.nii.ac.jp/crid/1523951030018348672","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Temporal Change of Dissolved Inorganic Carbon in the Subsurface Water at Station KNOT (44°N, 155°E) in the Western North Pacific Subpolar Region"},{"@language":"ja-Kana","@value":"Temporal Change of Dissolved Inorganic Carbon in the Subsurface Water at Station KNOT 44ドN 155ドE in the Western North Pacific Subpolar Region"}]},{"@id":"https://cir.nii.ac.jp/crid/1523951030349624064","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Time-series observation of dissolved inorganic carbon and nutrients in the northwestern North Pacific"},{"@language":"ja-Kana","@value":"Time series observation of dissolved inorganic carbon and nutrients in the northwestern North Pacific"}]},{"@id":"https://cir.nii.ac.jp/crid/2051714791998695936","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Wind-driven decadal sea surface height and main pycnocline depth changes in the western subarctic North 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