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Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean

dc.rights.licenseopenen_US
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
dc.contributor.authorHOEM, Frida
hal.structure.identifierUniversidad de Granada = University of Granada [UGR]
hal.structure.identifieriCLIMATE Aarhus University Interdisciplinary Centre for Climate Change
dc.contributor.authorLÓPEZ-QUIRÓS, Adrián
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
dc.contributor.authorVAN DE LAGEMAAT, Suzanna
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorETOURNEAU, Johan
hal.structure.identifierÉcole Pratique des Hautes Études [EPHE]
hal.structure.identifierVariabilité de l'Océan et de la Glace de mer [VOG]
dc.contributor.authorSICRE, Marie-Alexandrine
hal.structure.identifierInstituto Andaluz de Ciencias de la Tierra [IACT]
dc.contributor.authorESCUTIA, Carlota
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
hal.structure.identifierRoyal Netherlands Institute for Sea Research [NIOZ]
dc.contributor.authorBRINKHUIS, Henk
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
dc.contributor.authorPETERSE, Francien
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
dc.contributor.authorSANGIORGI, Francesca
hal.structure.identifierDepartment of Earth Sciences [Utrecht]
dc.contributor.authorBIJL, Peter
dc.date.accessioned2024-02-12T10:29:53Z
dc.date.available2024-02-12T10:29:53Z
dc.date.issued2023-03-01
dc.identifier.issn1814-9324en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188039
dc.description.abstractEnAt present, a strong latitudinal sea surface temperature (SST) gradient of ~16°C exists across the Southern Ocean, maintained by the Antarctic Circumpolar Current (ACC) and a set of complex frontal systems. Together with the Antarctic ice masses, this system has formed one of the most important global climate regulators. The timing of the onset of the ACCsystem, its development towards modern-day strength, and the consequences for e.g., the latitudinal SST gradient around the southern Atlantic Ocean, are still uncertain. Here we present new TEX$_{86}$-biomarker records, calibrated to SST, from two sites located east of Drake Passage (southern South Atlantic) to assist in better understanding two critical time intervals of prominent climate transitions during the Cenozoic: The Late Eocene-Early Oligocene (ODP Site 696) and Middle-Late Miocene (IODP Site U1536) transitions. Our results overall show rather temperate conditions (20-11°C) during the Late Eocene to Early Oligocene interval, with a weaker latitudinal SST gradient (~8°C) across the Atlantic sector of the Southern Ocean compared to present day (~16°C). We ascribe the regional similarity in SSTs across the Late Eocene-Early Oligocene South Atlantic to a persistent, strong Subpolar Gyre circulation, connecting all sites, which can only exist in absence of a strong throughflow across the Drake Passage. Surprisingly, the southern South Atlantic records show comparable SSTs (~12-14°C) during both the Earliest Oligocene Oxygen Isotope Step (EOIS, ~33.65 Ma) and the Miocene Climate Optimum (MCO, ~16.5 Ma). Apparently, maximum Oligocene Antarctic ice volume could coexist with warm ice-proximal surface ocean conditions, while at similar ocean temperatures, the Middle Miocene Antarctic ice sheet was strongly reduced. Southern South Atlantic SSTs cooled to ~5°C at the onset of the Middle Miocene Climate Transition (MMCT, 14 Ma), making it the coldest oceanic region recorded around Antarctica and the likely main location for deep water formation. The already cold southern South Atlantic conditions at MMCT meant it experienced little cooling during the latter part of the Miocene, which contrasts the profound cooling due to northward expansion of the Southern Ocean frontal systems in the lower latitudes and other sectors of the Southern Ocean.
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enLate Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/cp-19-1931-2023en_US
dc.subject.halSciences de l'environnementen_US
dc.subject.halSciences de l'environnement/Milieux et Changements globauxen_US
dc.description.sponsorshipEuropePaleoceanography of the Ice-proximal Southern Ocean during Past Warm Climatesen_US
bordeaux.journalClimate of the Pasten_US
bordeaux.page1931-1949en_US
bordeaux.volume19en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue10en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04283114
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Climate%20of%20the%20Past&rft.date=2023-03-01&rft.volume=19&rft.issue=10&rft.spage=1931-1949&rft.epage=1931-1949&rft.eissn=1814-9324&rft.issn=1814-9324&rft.au=HOEM,%20Frida&L%C3%93PEZ-QUIR%C3%93S,%20Adri%C3%A1n&VAN%20DE%20LAGEMAAT,%20Suzanna&ETOURNEAU,%20Johan&SICRE,%20Marie-Alexandrine&rft.genre=article


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