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Impact of the Agulhas Return Current on the oceanography of the Kerguelen Plateau region, Southern Ocean, over the last 40 kyrs

dc.rights.licenseopenen_US
hal.structure.identifierKochi University
dc.contributor.authorCIVEL-MAZENS, M.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCROSTA, Xavier
dc.contributor.authorCORTESE, G.
dc.contributor.authorMICHEL, E.
dc.contributor.authorMAZAUD, A.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorTHER, Olivier
dc.contributor.authorIKEHARA, M.
dc.contributor.authorITAKI, T.
dc.date.accessioned2024-02-12T09:28:32Z
dc.date.available2024-02-12T09:28:32Z
dc.date.issued2021-01
dc.identifier.issn0277-3791en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188031
dc.description.abstractEnThe oceanography of the western Indian sector of the Southern Ocean is extremely complex due to the presence of several subantartic islands and plateaus that alter the zonal flow of the Antarctic Circumpolar Current. The circulation is even more complex around the Kerguelen Islands (KI) as the hydrological fronts merge with the Agulhas Return Current, the latter transporting warm surface waters from the low latitudes to the Subantarctic Zone (SAZ) east of KI. Here we present new sea-surface and sub-surface temperatures, based on diatom and radiolarian census counts respectively, in two cores covering the last 40,000 years (40 kyrs) to infer past oceanographic changes in the KI region. In core MD11-3353, located in the Polar Front Zone (PFZ) west of KI, both sea-surface and sub-surface temperatures follow the expected glacial-interglacial pattern, with a constant difference of ∼3 °C, suggesting that the structure of the top 500 m of the water column did not change drastically over this period. In core MD12-3396CQ, located in the SAZ east of KI, the sub-surface temperature record again follows the expected glacial-interglacial pattern while the diatom-based reconstruction shows a strong warming during the 40-24 kyrs period, with a mean difference between the two of ∼9 °C. The temperature difference subsequently reverts to ∼3 °C during the glacial termination and Holocene. We suggest that the large difference between surface and sub-surface temperatures during the 40-24 kyrs period resulted from the injection of warm surface waters from the Indian low latitudes. This signal was transported to the core site by a strengthened Agulhas Return Current during the glacial, when the Agulhas leakage to the Atlantic was reduced. Our study thus proposes that the surface conditions in the SAZ of the KI region are shaped by the interplay between the migration of the Southern Ocean hydrological fronts and the Agulhas (Return) Current, both being climatically modulated.
dc.language.isoENen_US
dc.title.enImpact of the Agulhas Return Current on the oceanography of the Kerguelen Plateau region, Southern Ocean, over the last 40 kyrs
dc.title.alternativeQuat. Sci. Rev.en_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.quascirev.2020.106711en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphèreen_US
bordeaux.journalQuaternary Science Reviewsen_US
bordeaux.page106711en_US
bordeaux.volume251en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-03017175
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Quaternary%20Science%20Reviews&rft.date=2021-01&rft.volume=251&rft.spage=106711&rft.epage=106711&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=CIVEL-MAZENS,%20M.&CROSTA,%20Xavier&CORTESE,%20G.&MICHEL,%20E.&MAZAUD,%20A.&rft.genre=article


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