Abyssal ocean overturning shaped by seafloor distribution.
Identifieur interne : 005186 ( Ncbi/Merge ); précédent : 005185; suivant : 005187Abyssal ocean overturning shaped by seafloor distribution.
Auteurs : C. De Lavergne [Australie] ; G. Madec [France] ; F. Roquet [Suède] ; R M Holmes [Australie] ; T J Mcdougall [Australie]Source :
- Nature [ 1476-4687 ] ; 2017.
Abstract
The abyssal ocean is broadly characterized by northward flow of the densest waters and southward flow of less-dense waters above them. Understanding what controls the strength and structure of these interhemispheric flows-referred to as the abyssal overturning circulation-is key to quantifying the ocean's ability to store carbon and heat on timescales exceeding a century. Here we show that, north of 32° S, the depth distribution of the seafloor compels dense southern-origin waters to flow northward below a depth of about 4 kilometres and to return southward predominantly at depths greater than 2.5 kilometres. Unless ventilated from the north, the overlying mid-depths (1 to 2.5 kilometres deep) host comparatively weak mean meridional flow. Backed by analysis of historical radiocarbon measurements, the findings imply that the geometry of the Pacific, Indian and Atlantic basins places a major external constraint on the overturning structure.
DOI: 10.1038/nature24472
PubMed: 29120416
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Madec</name><affiliation wicri:level="1"><nlm:affiliation>LOCEAN Laboratory, Sorbonne Universités (Université Pierre et Marie Curie Paris 6)-CNRS-IRD-MNHN, F-75005 Paris, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LOCEAN Laboratory, Sorbonne Universités (Université Pierre et Marie Curie Paris 6)-CNRS-IRD-MNHN, F-75005 Paris</wicri:regionArea><wicri:noRegion>75005 Paris</wicri:noRegion><wicri:noRegion>75005 Paris</wicri:noRegion></affiliation></author><author><name sortKey="Roquet, F" sort="Roquet, F" uniqKey="Roquet F" first="F" last="Roquet">F. 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Understanding what controls the strength and structure of these interhemispheric flows-referred to as the abyssal overturning circulation-is key to quantifying the ocean's ability to store carbon and heat on timescales exceeding a century. Here we show that, north of 32° S, the depth distribution of the seafloor compels dense southern-origin waters to flow northward below a depth of about 4 kilometres and to return southward predominantly at depths greater than 2.5 kilometres. Unless ventilated from the north, the overlying mid-depths (1 to 2.5 kilometres deep) host comparatively weak mean meridional flow. Backed by analysis of historical radiocarbon measurements, the findings imply that the geometry of the Pacific, Indian and Atlantic basins places a major external constraint on the overturning structure.</div></front></TEI><pubmed><MedlineCitation Status="In-Data-Review" Owner="NLM"><PMID Version="1">29120416</PMID><DateCreated><Year>2017</Year><Month>11</Month><Day>09</Day></DateCreated><DateRevised><Year>2017</Year><Month>11</Month><Day>09</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1476-4687</ISSN><JournalIssue CitedMedium="Internet"><Volume>551</Volume><Issue>7679</Issue><PubDate><Year>2017</Year><Month>Nov</Month><Day>08</Day></PubDate></JournalIssue><Title>Nature</Title><ISOAbbreviation>Nature</ISOAbbreviation></Journal><ArticleTitle>Abyssal ocean overturning shaped by seafloor distribution.</ArticleTitle><Pagination><MedlinePgn>181-186</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1038/nature24472</ELocationID><Abstract><AbstractText>The abyssal ocean is broadly characterized by northward flow of the densest waters and southward flow of less-dense waters above them. Understanding what controls the strength and structure of these interhemispheric flows-referred to as the abyssal overturning circulation-is key to quantifying the ocean's ability to store carbon and heat on timescales exceeding a century. Here we show that, north of 32° S, the depth distribution of the seafloor compels dense southern-origin waters to flow northward below a depth of about 4 kilometres and to return southward predominantly at depths greater than 2.5 kilometres. Unless ventilated from the north, the overlying mid-depths (1 to 2.5 kilometres deep) host comparatively weak mean meridional flow. Backed by analysis of historical radiocarbon measurements, the findings imply that the geometry of the Pacific, Indian and Atlantic basins places a major external constraint on the overturning structure.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>de Lavergne</LastName><ForeName>C</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>LOCEAN Laboratory, Sorbonne Universités (Université Pierre et Marie Curie Paris 6)-CNRS-IRD-MNHN, F-75005 Paris, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Madec</LastName><ForeName>G</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>LOCEAN Laboratory, Sorbonne Universités (Université Pierre et Marie Curie Paris 6)-CNRS-IRD-MNHN, F-75005 Paris, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Roquet</LastName><ForeName>F</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>Department of Meteorology (MISU), Stockholm University, 114 18 Stockholm, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Holmes</LastName><ForeName>R M</ForeName><Initials>RM</Initials><AffiliationInfo><Affiliation>School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Climate Change Research Centre and ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales 2052, Australia.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>McDougall</LastName><ForeName>T J</ForeName><Initials>TJ</Initials><AffiliationInfo><Affiliation>School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Nature</MedlineTA><NlmUniqueID>0410462</NlmUniqueID><ISSNLinking>0028-0836</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2017</Year><Month>04</Month><Day>18</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2017</Year><Month>10</Month><Day>05</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2017</Year><Month>11</Month><Day>10</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2017</Year><Month>11</Month><Day>10</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2017</Year><Month>11</Month><Day>10</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">29120416</ArticleId><ArticleId IdType="pii">nature24472</ArticleId><ArticleId IdType="doi">10.1038/nature24472</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Australie</li><li>France</li><li>Suède</li></country><region><li>Comté de Stockholm</li><li>Svealand</li></region><settlement><li>Stockholm</li></settlement><orgName><li>Université de Stockholm</li></orgName></list><tree><country name="Australie"><noRegion><name sortKey="De Lavergne, C" sort="De Lavergne, C" uniqKey="De Lavergne C" first="C" last="De Lavergne">C. De Lavergne</name></noRegion><name sortKey="Holmes, R M" sort="Holmes, R M" uniqKey="Holmes R" first="R M" last="Holmes">R M Holmes</name><name sortKey="Mcdougall, T J" sort="Mcdougall, T J" uniqKey="Mcdougall T" first="T J" last="Mcdougall">T J Mcdougall</name></country><country name="France"><noRegion><name sortKey="Madec, G" sort="Madec, G" uniqKey="Madec G" first="G" last="Madec">G. Madec</name></noRegion></country><country name="Suède"><region name="Svealand"><name sortKey="Roquet, F" sort="Roquet, F" uniqKey="Roquet F" first="F" last="Roquet">F. Roquet</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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