Glacial reduction and millennial-scale variations in Drake Passage throughflow.
Identifieur interne : 000257 ( PubMed/Checkpoint ); précédent : 000256; suivant : 000258Glacial reduction and millennial-scale variations in Drake Passage throughflow.
Auteurs : Frank Lamy [Allemagne] ; Helge W. Arz [Allemagne] ; Rolf Kilian [Chili] ; Carina B. Lange [Chili] ; Lester Lembke-Jene [Allemagne] ; Marc Wengler [Allemagne] ; Jérôme Kaiser [Allemagne] ; Oscar Baeza-Urrea [Allemagne] ; Ian R. Hall [Royaume-Uni] ; Naomi Harada [Japon] ; Ralf Tiedemann [Allemagne]Source :
- Proceedings of the National Academy of Sciences of the United States of America [ 1091-6490 ] ; 2015.
Abstract
The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean's role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to ∼ 40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific-Atlantic exchange through the DP ("cold water route"). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent.
DOI: 10.1073/pnas.1509203112
PubMed: 26417070
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Arz</name><affiliation wicri:level="1"><nlm:affiliation>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde</wicri:regionArea><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion></affiliation></author><author><name sortKey="Kilian, Rolf" sort="Kilian, Rolf" uniqKey="Kilian R" first="Rolf" last="Kilian">Rolf Kilian</name><affiliation wicri:level="1"><nlm:affiliation>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier, Germany; Instituto de la Patagonia, Universidad de Magallanes, 6200000 Punta Arenas, Chile;</nlm:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier, Germany; Instituto de la Patagonia, Universidad de Magallanes, 6200000 Punta Arenas</wicri:regionArea><wicri:noRegion>6200000 Punta Arenas</wicri:noRegion></affiliation></author><author><name sortKey="Lange, Carina B" sort="Lange, Carina B" uniqKey="Lange C" first="Carina B" last="Lange">Carina B. Lange</name><affiliation wicri:level="1"><nlm:affiliation>Department of Oceanography and Center for Oceanographic Research in the Eastern South Pacific (COPAS), COPAS Sur-Austral Program, University of Concepción, 4030000 Concepción, Chile;</nlm:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>Department of Oceanography and Center for Oceanographic Research in the Eastern South Pacific (COPAS), COPAS Sur-Austral Program, University of Concepción, 4030000 Concepción</wicri:regionArea><wicri:noRegion>4030000 Concepción</wicri:noRegion></affiliation></author><author><name sortKey="Lembke Jene, Lester" sort="Lembke Jene, Lester" uniqKey="Lembke Jene L" first="Lester" last="Lembke-Jene">Lester Lembke-Jene</name><affiliation wicri:level="1"><nlm:affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven</wicri:regionArea><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion></affiliation></author><author><name sortKey="Wengler, Marc" sort="Wengler, Marc" uniqKey="Wengler M" first="Marc" last="Wengler">Marc Wengler</name><affiliation wicri:level="1"><nlm:affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven</wicri:regionArea><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion></affiliation></author><author><name sortKey="Kaiser, Jerome" sort="Kaiser, Jerome" uniqKey="Kaiser J" first="Jérôme" last="Kaiser">Jérôme Kaiser</name><affiliation wicri:level="1"><nlm:affiliation>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde</wicri:regionArea><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion><wicri:noRegion>18119 Rostock-Warnemünde</wicri:noRegion></affiliation></author><author><name sortKey="Baeza Urrea, Oscar" sort="Baeza Urrea, Oscar" uniqKey="Baeza Urrea O" first="Oscar" last="Baeza-Urrea">Oscar Baeza-Urrea</name><affiliation wicri:level="1"><nlm:affiliation>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier</wicri:regionArea><wicri:noRegion>54286 Trier</wicri:noRegion><wicri:noRegion>54286 Trier</wicri:noRegion><wicri:noRegion>54286 Trier</wicri:noRegion></affiliation></author><author><name sortKey="Hall, Ian R" sort="Hall, Ian R" uniqKey="Hall I" first="Ian R" last="Hall">Ian R. Hall</name><affiliation wicri:level="1"><nlm:affiliation>School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT, United Kingdom;</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT</wicri:regionArea><wicri:noRegion>Cardiff CF10 3AT</wicri:noRegion></affiliation></author><author><name sortKey="Harada, Naomi" sort="Harada, Naomi" uniqKey="Harada N" first="Naomi" last="Harada">Naomi Harada</name><affiliation wicri:level="1"><nlm:affiliation>Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061</wicri:regionArea><wicri:noRegion>Yokosuka 237-0061</wicri:noRegion></affiliation></author><author><name sortKey="Tiedemann, Ralf" sort="Tiedemann, Ralf" uniqKey="Tiedemann R" first="Ralf" last="Tiedemann">Ralf Tiedemann</name><affiliation wicri:level="1"><nlm:affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven</wicri:regionArea><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion></affiliation></author></analytic><series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title><idno type="eISSN">1091-6490</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean's role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to ∼ 40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific-Atlantic exchange through the DP ("cold water route"). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">26417070</PMID><DateCreated><Year>2015</Year><Month>11</Month><Day>04</Day></DateCreated><DateCompleted><Year>2016</Year><Month>02</Month><Day>03</Day></DateCompleted><DateRevised><Year>2015</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1091-6490</ISSN><JournalIssue CitedMedium="Internet"><Volume>112</Volume><Issue>44</Issue><PubDate><Year>2015</Year><Month>Nov</Month><Day>03</Day></PubDate></JournalIssue><Title>Proceedings of the National Academy of Sciences of the United States of America</Title><ISOAbbreviation>Proc. Natl. Acad. Sci. U.S.A.</ISOAbbreviation></Journal><ArticleTitle>Glacial reduction and millennial-scale variations in Drake Passage throughflow.</ArticleTitle><Pagination><MedlinePgn>13496-501</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1073/pnas.1509203112</ELocationID><Abstract><AbstractText>The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean's role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to ∼ 40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific-Atlantic exchange through the DP ("cold water route"). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Lamy</LastName><ForeName>Frank</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany; Frank.Lamy@awi.de.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Arz</LastName><ForeName>Helge W</ForeName><Initials>HW</Initials><AffiliationInfo><Affiliation>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde, Germany;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kilian</LastName><ForeName>Rolf</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier, Germany; Instituto de la Patagonia, Universidad de Magallanes, 6200000 Punta Arenas, Chile;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lange</LastName><ForeName>Carina B</ForeName><Initials>CB</Initials><AffiliationInfo><Affiliation>Department of Oceanography and Center for Oceanographic Research in the Eastern South Pacific (COPAS), COPAS Sur-Austral Program, University of Concepción, 4030000 Concepción, Chile;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lembke-Jene</LastName><ForeName>Lester</ForeName><Initials>L</Initials><Identifier Source="ORCID">http://orcid.org/0000-0002-6873-8533</Identifier><AffiliationInfo><Affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Wengler</LastName><ForeName>Marc</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kaiser</LastName><ForeName>Jérôme</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Department of Marine Geology, Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde, Germany;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Baeza-Urrea</LastName><ForeName>Oscar</ForeName><Initials>O</Initials><AffiliationInfo><Affiliation>Geologie, Fachbereich Raum- und Umweltwissenschaften, Universität Trier, 54286 Trier, Germany;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hall</LastName><ForeName>Ian R</ForeName><Initials>IR</Initials><AffiliationInfo><Affiliation>School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT, United Kingdom;</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Harada</LastName><ForeName>Naomi</ForeName><Initials>N</Initials><AffiliationInfo><Affiliation>Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Tiedemann</LastName><ForeName>Ralf</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany;</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2015</Year><Month>09</Month><Day>28</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Proc Natl Acad Sci U S A</MedlineTA><NlmUniqueID>7505876</NlmUniqueID><ISSNLinking>0027-8424</ISSNLinking></MedlineJournalInfo><CommentsCorrectionsList><CommentsCorrections RefType="Cites"><RefSource>Nature. 2011 Apr 28;472(7344):429-36</RefSource><PMID Version="1">21525925</PMID></CommentsCorrections></CommentsCorrectionsList><OtherID Source="NLM">PMC4640728</OtherID><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Antarctic Circumpolar Current</Keyword><Keyword MajorTopicYN="N">Drake Passage</Keyword><Keyword MajorTopicYN="N">glacial–interglacial changes</Keyword><Keyword MajorTopicYN="N">paleoceanography</Keyword><Keyword MajorTopicYN="N">sedimentology</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2015</Year><Month>9</Month><Day>30</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>9</Month><Day>30</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2015</Year><Month>9</Month><Day>30</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26417070</ArticleId><ArticleId IdType="pii">1509203112</ArticleId><ArticleId IdType="doi">10.1073/pnas.1509203112</ArticleId><ArticleId IdType="pmc">PMC4640728</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Allemagne</li><li>Chili</li><li>Japon</li><li>Royaume-Uni</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Lamy, Frank" sort="Lamy, Frank" uniqKey="Lamy F" first="Frank" last="Lamy">Frank Lamy</name></noRegion><name sortKey="Arz, Helge W" sort="Arz, Helge W" uniqKey="Arz H" first="Helge W" last="Arz">Helge W. Arz</name><name sortKey="Baeza Urrea, Oscar" sort="Baeza Urrea, Oscar" uniqKey="Baeza Urrea O" first="Oscar" last="Baeza-Urrea">Oscar Baeza-Urrea</name><name sortKey="Kaiser, Jerome" sort="Kaiser, Jerome" uniqKey="Kaiser J" first="Jérôme" last="Kaiser">Jérôme Kaiser</name><name sortKey="Lembke Jene, Lester" sort="Lembke Jene, Lester" uniqKey="Lembke Jene L" first="Lester" last="Lembke-Jene">Lester Lembke-Jene</name><name sortKey="Tiedemann, Ralf" sort="Tiedemann, Ralf" uniqKey="Tiedemann R" first="Ralf" last="Tiedemann">Ralf Tiedemann</name><name sortKey="Wengler, Marc" sort="Wengler, Marc" uniqKey="Wengler M" first="Marc" last="Wengler">Marc Wengler</name></country><country name="Chili"><noRegion><name sortKey="Kilian, Rolf" sort="Kilian, Rolf" uniqKey="Kilian R" first="Rolf" last="Kilian">Rolf Kilian</name></noRegion><name sortKey="Lange, Carina B" sort="Lange, Carina B" uniqKey="Lange C" first="Carina B" last="Lange">Carina B. Lange</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Hall, Ian R" sort="Hall, Ian R" uniqKey="Hall I" first="Ian R" last="Hall">Ian R. Hall</name></noRegion></country><country name="Japon"><noRegion><name sortKey="Harada, Naomi" sort="Harada, Naomi" uniqKey="Harada N" first="Naomi" last="Harada">Naomi Harada</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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