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Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice

dc.rights.licenseopenen_US
dc.contributor.authorJOHNSON, Katelyn
dc.contributor.authorMCKAY, Robert
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorETOURNEAU, Johan
dc.contributor.authorJIMÉNEZ-ESPEJO, Francisco
dc.contributor.authorALBOT, Anya
dc.contributor.authorRIESSELMAN, Christina
dc.contributor.authorBERTLER, Nancy
dc.contributor.authorHORGAN, Huw
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCROSTA, Xavier
dc.contributor.authorBENDLE, James
dc.contributor.authorASHLEY, Kate
dc.contributor.authorYAMANE, Masako
dc.contributor.authorYOKOYAMA, Yusuke
dc.contributor.authorPEKAR, Stephen
dc.contributor.authorESCUTIA, Carlota
dc.contributor.authorDUNBAR, Robert
dc.date.accessioned2024-05-22T13:34:03Z
dc.date.available2024-05-22T13:34:03Z
dc.date.issued2021-10
dc.identifier.issn1752-0894en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199990
dc.description.abstractEnAntarctic sea-ice extent, primary productivity and ocean circulation represent interconnected systems that form important components of the global carbon cycle. Subdecadal to centennial-scale variability can influence the characteristics and interactions of these systems, but observational records are too short to evaluate the impacts of this variability over longer timescales. Here, we use a 170-m-long sediment core collected from Integrated Ocean Drilling Program Site U1357B, offshore Adélie Land, East Antarctica to disentangle the impacts of sea ice and subdecadal climate variability on phytoplankton bloom frequency over the last ~11,400 years. We apply X-ray computed tomography, Ice Proxy for the Southern Ocean with 25 carbon atoms, diatom, physical property and geochemical analyses to the core, which contains an annually resolved, continuously laminated archive of phytoplankton bloom events. Bloom events occurred annually to biennially through most of the Holocene, but became less frequent (~2–7 years) at ~4.5 ka when coastal sea ice intensified. We propose that coastal sea-ice intensification subdued annual sea-ice break-out, causing an increased sensitivity of sea-ice dynamics to subdecadal climate modes, leading to a subdecadal frequency of bloom events. Our data suggest that projected loss of coastal sea ice will impact the influence of subdecadal variability on Antarctic margin primary productivity, altering food webs and carbon-cycling processes at seasonal timescales.
dc.language.isoENen_US
dc.title.enSensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice
dc.title.alternativeNat. Geosci.en_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1038/s41561-021-00816-yen_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.journalNature Geoscienceen_US
bordeaux.page762-768en_US
bordeaux.volume14en_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-03529697
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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