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Millennial-scale fluctuations of the European Ice Sheet at the end of the last glacial, and their potential impact on global climate

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorTOUCANNE, Samuel
hal.structure.identifierInstitut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
dc.contributor.authorSOULET, Guillaume
hal.structure.identifierUnité Géosciences Marines [GM]
dc.contributor.authorFRESLON, Nicolas
dc.contributor.authorJACINTO, Ricardo Silva
hal.structure.identifierUnité Géosciences Marines [GM]
dc.contributor.authorDENNIELOU, Bernard
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorEYNAUD, Frederique
IDREF: 144113570
hal.structure.identifierUnité Géosciences Marines [GM]
dc.contributor.authorBOURILLET, Jean-Francois
hal.structure.identifierUnité Géosciences Marines [GM]
dc.contributor.authorBAYON, Germain
dc.date.accessioned2024-06-18T09:28:05Z
dc.date.available2024-06-18T09:28:05Z
dc.date.issued2015-09
dc.identifier.issn0277-3791en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200522
dc.description.abstractEnReconstructing Northern Hemisphere ice-sheet oscillations and meltwater routing to the ocean is important to better understand the mechanisms behind abrupt climate changes. To date, research efforts have mainly focused on the North American (Laurentide) ice-sheets (LIS), leaving the potential role of the European Ice Sheet (EIS), and of the Scandinavian ice-sheet (SIS) in particular, largely unexplored. Using neodymium isotopes in detrital sediments deposited off the Channel River, we provide a continuous and well-dated record for the evolution of the EIS southern margin through the end of the last glacial period and during the deglaciation. Our results reveal that the evolution of EIS margins was accompanied with substantial ice recession (especially of the SIS) and simultaneous release of meltwater to the North Atlantic. These events occurred both in the course of the EIS to its LGM position (i.e., during Heinrich Stadial –HS– 3 and HS2; ∼31–29 ka and ∼26–23 ka, respectively) and during the deglaciation (i.e., at ∼22 ka, ∼20–19 ka and from 18.2 ± 0.2 to 16.7 ± 0.2 ka that corresponds to the first part of HS1). The deglaciation was discontinuous in character, and similar in timing to that of the southern LIS margin, with moderate ice-sheet retreat (from 22.5 ± 0.2 ka in the Baltic lowlands) as soon as the northern summer insolation increase (from ∼23 ka) and an acceleration of the margin retreat thereafter (from ∼20 ka). Importantly, our results show that EIS retreat events and release of meltwater to the North Atlantic during the deglaciation coincide with AMOC destabilisation and interhemispheric climate changes. They thus suggest that the EIS, together with the LIS, could have played a critical role in the climatic reorganization that accompanied the last deglaciation. Finally, our data suggest that meltwater discharges to the North Atlantic produced by large-scale recession of continental parts of Northern Hemisphere ice sheets during HS, could have been a possible source for the oceanic perturbations (i.e., AMOC shutdown) responsible for the marine-based ice stream purge cycle, or so-called HE's, that punctuate the last glacial period.
dc.language.isoENen_US
dc.title.enMillennial-scale fluctuations of the European Ice Sheet at the end of the last glacial, and their potential impact on global climate
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.quascirev.2015.06.010en_US
dc.subject.halPlanète et Univers [physics]en_US
bordeaux.journalQuaternary Science Reviewsen_US
bordeaux.page113-133en_US
bordeaux.volume123en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04200658
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=2015-09&rft.volume=123&rft.spage=113-133&rft.epage=113-133&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=TOUCANNE,%20Samuel&SOULET,%20Guillaume&FRESLON,%20Nicolas&JACINTO,%20Ricardo%20Silva&DENNIELOU,%20Bernard&rft.genre=article


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