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Ocean Productivity in the Gulf of Cadiz Over the Last 50 kyr

dc.rights.licenseopenen_US
dc.contributor.authorPENAUD, Aurelie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorEYNAUD, Frederique
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorETOURNEAU, Johan
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBONNIN, Jerome
dc.contributor.authorDE VERNAL, Anne
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
dc.contributor.authorKIM, Jung-Hyun
dc.contributor.authorKANG, Sujin
dc.contributor.authorGAL, Jong-Ku
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorOLIVEIRA, Dulce
dc.contributor.authorWAELBROECK, Claire
dc.date.accessioned2023-11-08T14:41:39Z
dc.date.available2023-11-08T14:41:39Z
dc.date.issued2022-01-25
dc.identifier.issn2572-4525en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/184689
dc.description.abstractEnReconstructions of ocean primary productivity (PP) help to explain past and present biogeochemical cycles and climate changes in the oceans. We document PP variations over the last 50 kyr in a currently oligotrophic subtropical region, the Gulf of Cadiz. Data combine refined results from previous investigations on dinocyst assemblages, alkenones, and stable isotopes (18O, 13C) in planktonic (Globigerina bulloides) and endobenthic (Uvigerina mediterranea) foraminifera from cores MD04-2805 CQ and MD99-2339, with new isotopic measurements on epibenthic (Cibicides pachyderma-Cibicidoides wuellerstorfi) foraminifera and dinocyst-based estimates of PP using the new n = 1,968 modern database. We constrain PP variations and export production by integrating qualitative information from bioindicators with dinocyst-based quantitative reconstructions such as PP and seasonal sea surface temperature and information about remineralization from the benthic Δδ13C (difference between epibenthic and endobenthic foraminiferal δ13C signatures). This study also includes new information on alkenone-based SST and total organic carbon which provides insights into the relationship between past regional hydrological activity and PP regime change. We show that PP, carbon export, and remineralization were generally high in the NE subtropical Atlantic Ocean during the last glacial period and that the Last Glacial Maximum (LGM) had lower Δδ13C than the Heinrich Stadials with sustained high PP, likely allowing enhanced carbon sequestration. We link these PP periods to the dynamics of upwelling, active almost year-round during sadials, but restricted to spring-summer during interstadials and LGM, like today. During interstadials, nutrient advection through freshwater inputs during autumn-winter needs also to be considered to fully understand PP regimes.
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.title.enOcean Productivity in the Gulf of Cadiz Over the Last 50 kyr
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2021PA004316en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalPaleoceanography and Paleoclimatologyen_US
bordeaux.volume37en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Paleoceanography%20and%20Paleoclimatology&rft.date=2022-01-25&rft.volume=37&rft.issue=2&rft.eissn=2572-4525&rft.issn=2572-4525&rft.au=PENAUD,%20Aurelie&EYNAUD,%20Frederique&ETOURNEAU,%20Johan&BONNIN,%20Jerome&DE%20VERNAL,%20Anne&rft.genre=article


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