{"@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/1361418521237353984.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/1999gb900038"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F1999GB900038"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/1999GB900038"}},{"identifier":{"@type":"NAID","@value":"30013377775"}}],"dc:title":[{"@value":"The δ<sup>15</sup>N of nitrate in the southern ocean: Consumption of nitrate in surface waters"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We report nitrogen isotope data for nitrate from transects of hydrocast and surface samples collected in the eastern Indian and Pacific sectors of the Southern Ocean, focusing here on the data from the upper water column to study the effect of nitrate consumption by phytoplankton. The δ<jats:sup>15</jats:sup>N of nitrate increases by 1–2‰ from deep water into the Antarctic summertime surface layer, due to kinetic isotopic fractionation during nitrate uptake. Estimation of the nitrate uptake isotope effect from Antarctic depth profiles yields values in the range of 5–6‰ in east Indian sector and 4–5‰ in the east Pacific sector. Surface transect data from the Pacific sector also yield values of 4–5‰. The major uncertainty in the profile‐based estimation of the isotope effect involves the δ<jats:sup>15</jats:sup>N of nitrate from the temperature minimum layer below the summertime Antarctic surface layer, which deviates significantly from the predictions of simple models of isotope fractionation. For the Subantarctic surface, it is possible to distinguish between nitrate supplied laterally from the surface Antarctic and nitrate supplied vertically from the Subantarctic thermocline because of the distinctive relationships between the δ<jats:sup>15</jats:sup>N and concentration of nitrate in these two potential sources. Our Subantarctic samples, collected during the summer and fall, indicate that nitrate is supplied to the Subantarctic surface largely by northward transport of Antarctic surface water. Isotopic data from the Pacific sector of the Subantarctic suggest an isotope effect of 4.5‰, indistinguishable from the Antarctic estimates in this sector.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1581417126361524352","@type":"Researcher","foaf:name":[{"@value":"D. M. Sigman"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418521237353984","@type":"Researcher","foaf:name":[{"@value":"M. A. Altabet"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418521237353986","@type":"Researcher","foaf:name":[{"@value":"D. C. McCorkle"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418521237353987","@type":"Researcher","foaf:name":[{"@value":"R. Francois"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418521237353856","@type":"Researcher","foaf:name":[{"@value":"G. Fischer"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"08866236"},{"@type":"EISSN","@value":"19449224"}],"prism:publicationName":[{"@value":"Global Biogeochemical Cycles"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1999-12","prism:volume":"13","prism:number":"4","prism:startingPage":"1149","prism:endingPage":"1166"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F1999GB900038"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/1999GB900038"}],"createdAt":"2002-09-17","modifiedAt":"2023-09-23","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001338805649280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach"},{"@value":"Seasonal shifts in the contributions of the Changjiang River and the  Kuroshio Current to nitrate dynamics at the continental shelf of the  northern East China Sea based on a nitrate dual isotopic composition  approach"}]},{"@id":"https://cir.nii.ac.jp/crid/1050869456411431552","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific : A new proxy for marine nitrate dynamics"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004231875437184","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Organic Nitrogen: Sources, Fates, and Chemistry"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298757167523200","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567182054572800","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Surface nitrate utilization in the Bering sea since 180 kA BP: Insight from sedimentary nitrogen isotopes"}]},{"@id":"https://cir.nii.ac.jp/crid/1390021920649560704","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Paleoceanographic analyses using nitrogen isotopic compositions"},{"@language":"ja","@value":"窒素同位体比を用いた古海洋解析"},{"@language":"ja-Kana","@value":"チッソ ドウイタイヒ オ モチイタ コカイヨウ カイセキ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679416107008","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"安定同位体を用いた流域生態系における窒素循環研究の可能性について"},{"@language":"en","@value":"Studies on Nitrogen Dynamics in Lotic Ecosystems Using Stable Isotope Techniques"},{"@value":"流域の水・物質循環とそれを保全・管理するための水文学・生態学的視点 安定同位体を用いた流域生態系における窒素循環研究の可能性について"},{"@language":"ja-Kana","@value":"リュウイキ ノ ミズ ブッシツ ジュンカン ト ソレ オ ホゼン カンリ スル タメ ノ スイモンガク セイタイガクテキ シテン アンテイ ドウイタイ オ モチイタ リュウイキ セイタイケイ ニ オケル チッソ ジュンカン ケンキュウ ノ カノウセイ ニ ツイテ"}]},{"@id":"https://cir.nii.ac.jp/crid/1520291854769388928","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Modified Method for the Analysis of Nitrogen Isotopic Composition of Oceanic Nitrate at Low Concentration"},{"@language":"ja-Kana","@value":"Modified Method for the Analysis of Nitrogen Isotopic Composition of Oceanic Nitrate at Low Concentration"}]},{"@id":"https://cir.nii.ac.jp/crid/1521699230680948352","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"Nitrate-Nitrogen Isotopic Patterns in Surface Waters of the Western and Central Equatorial Pacific"},{"@language":"ja-Kana","@value":"Nitrate Nitrogen Isotopic Patterns in Surface Waters of the Western and Central Equatorial Pacific"}]},{"@id":"https://cir.nii.ac.jp/crid/1521699230854089216","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"δ15N of PON and Nitrate as a Clue to the Origin and Transformation of Nitrogen in the Subarctic North Pacific and Its Marginal Sea"},{"@language":"ja-Kana","@value":"デルタ 15N of PON and Nitrate as a Clue to the Origin and Transformation of Nitrogen in the Subarctic North Pacific and Its Marginal Sea"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842031801984","@type":"Article","resourceType":"学術雑誌論文(journal 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