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Evidence of the largest Late Holocene mountain glacier extent in southern and southeastern Greenland during the middle Neoglacial from 10Be moraine dating

dc.rights.licenseopenen_US
dc.contributor.authorBIETTE, Melody
dc.contributor.authorJOMELLI, Vincent
dc.contributor.authorCHENET, Marie
dc.contributor.authorBRAUCHER, Regis
dc.contributor.authorMENVIEL, Laurie
dc.contributor.authorSWINGEDOUW, Didier
dc.contributor.authorRINTERKNECHT, Vincent
dc.contributor.authorTEAM, Aster
dc.date.accessioned2022-11-24T09:34:20Z
dc.date.available2022-11-24T09:34:20Z
dc.date.issued2022-01
dc.identifier.issn1502-3885en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/170372
dc.description.abstractEnThe timing of mountain glacier fluctuations is poorly constrained in some parts of Greenland during the Late Holocene. We present 31 10Be cosmic-ray exposure ages (CRE) of boulders collected from three mountain glacier moraines located in the Tasilap valley, in southeastern Greenland, and 10 10Be CRE ages from one mountain glacier in the Isortup valley, in southern Greenland. For the first time in these areas, mountain glacier fluctuations are documented from moraine CRE for the Late Holocene period. Several glacier advances during the Late Holocene are revealed with exposure ages ranging from 3.90±0.26 to 0.4±0.04 ka. Moraines of three of the four glaciers investigated, dated to 3.75±0.13 ka (n = 3), 3.3±0.19 ka (n = 2) and 2.87±0.13 ka (n = 3), show a common timing of the largest glacier expansion during the Late Holocene. Evidence of at least one individual moraine deposited at ~1.2 ka was found on all glaciers. Finally, the most recent period of glacial advance during the Late Holocene is documented by one glacier in each valley at ~0.66–0.70 ka. The maximum glacier extent at ~3 ka differs from the Late Holocene glacier maximum extent usually reported during the Little Ice Age in east Greenland based on moraine dating and lake sediments. We suggest that the combination of a stronger East Greenland Current and a weaker Irminger Current, potentially associated with increased sea-ice concentration, superimposed on the long-term decrease in summer insolation during the Late Holocene could be responsible for this large glacial advance at ~3 ka in southern and southeastern Greenland.
dc.language.isoENen_US
dc.title.enEvidence of the largest Late Holocene mountain glacier extent in southern and southeastern Greenland during the middle Neoglacial from 10Be moraine dating
dc.typeArticle de revueen_US
dc.identifier.doi10.1111/bor.12555en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalBoreasen_US
bordeaux.page61-77en_US
bordeaux.volume51en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-03662941
hal.exportfalse
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Boreas&rft.date=2022-01&rft.volume=51&rft.issue=1&rft.spage=61-77&rft.epage=61-77&rft.eissn=1502-3885&rft.issn=1502-3885&rft.au=BIETTE,%20Melody&JOMELLI,%20Vincent&CHENET,%20Marie&BRAUCHER,%20Regis&MENVIEL,%20Laurie&rft.genre=article


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