georefid:2013-043175SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1073/pnas.11155451092012-01-01publicationgeorefid:2013-043175doi:10.1073/pnas.1115545109Caley, ThibautUniversity of Bordeaux, Centre National de la Recherche Scientifique, Environnements et Paleoenvironnnements Oceaniques et Continentaux, Talence, FranceauthorGiraudeau, JacquesUniversity of Pierre et Marie Curie, FranceauthorMalaize, BrunoauthorRossignol, LindaauthorPierre, CatherineauthorNational Academy of Sciences, Washington, DC, United StatespublisherdocumentDigitalProceedings of the National Academy of Sciences of the United States of America109 (18)6835-6839Heat and salt transfer from the Indian Ocean to the Atlantic Ocean (Agulhas leakage) has an important effect on the global thermohaline circulation and climate. The lack of long transfer record prevents elucidation of its role on climate changes throughout the Quaternary. Here, we present a 1,350-ka accumulation rate record of the planktic foraminiferal species Globorotalia menardii. We demonstrate that, according to previous assumptions, the presence and reseeding of this fauna in the subtropical southeast Atlantic was driven by interocean exchange south of Africa. The Agulhas transfer strengthened at glacial ice-volume maxima for every glacial-interglacial transition, with maximum reinforcements organized according to a 400-ka periodicity. The long-term dynamics of Agulhas leakage may have played a crucial role in regulating meridional overturning circulation and global climate changes during the Mid-Brunhes event and the Mid-Pleistocene transition, and could also play an important role in the near future.completedIsotope geochemistryQuaternary geologyAgulhas leakageAtlantic meridional overturning circulationAtlantic OceanBrunhes ChronC-13/C-12Cape BasincarbonCenozoicclimate changeForaminiferaGlobigerinaceaGloborotaliaGloborotalia menardiiGloborotaliidaeHoloceneIndian OceanInvertebrataisotope ratiosisotopesLeg 175microfossilsO-18/O-16ocean circulationOcean Drilling ProgramODP Site 1087oxygenpaleo-oceanographyplanktonic taxaProtistaQuaternaryratesRotaliinasedimentationsedimentation ratesSouth AtlanticSoutheast Atlanticstable isotopesthermohaline circulationupper Holoceneupper Quaternaryurn:org.iodp:exp:175urnlargerWorkCitationcampaignurn:org.iodp:exp:175:site:1087urnlargerWorkCitationstudyurn:org.iodp:exp:175urnlargerWorkCitationcampaignEnglishgeoscientificInformation15.183915.1839-31.2754-31.2754Supplemental information/data is available in the online version of this article; University Bordeaux 1/Centre National de la Recherche Scientifique/Unite Mixte de Recherche 5805 Environnements et Paleoenvironnements Oceaniques et Continentaux Contrib. No. 1842application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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