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Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems

dc.rights.licenseopenen_US
dc.contributor.authorNEHME, Carole
dc.contributor.authorTODISCO, Dominique
dc.contributor.authorBREITENBACH, Sebastian
dc.contributor.authorCOUCHOUD, Isabelle
dc.contributor.authorMARCHEGIANO, Marta
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPERAL, Marion
dc.contributor.authorVONHOF, Hubert
dc.contributor.authorHELLSTROM, John
dc.contributor.authorTJALLINGII, Rik
dc.contributor.authorCLAEYS, Philippe
dc.contributor.authorBORRERO, L.
dc.contributor.authorMARTIN, Fabiana
dc.date.accessioned2024-01-29T12:53:37Z
dc.date.available2024-01-29T12:53:37Z
dc.date.issued2023-02-03
dc.identifier.issn0921-8181en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187591
dc.description.abstractEnPatagonia is ideally situated to reconstruct past migrations of the southern westerly winds (SWWs) due to itssoutherly maritime location. The SWWs are an important driver of Southern Ocean upwelling and their strengthand latitudinal position changed during the Holocene, leading thus to different responses of the vegetation topast climate changes along the Chilean continental margin. A new speleothem record from Cueva Chica (51◦S) isinvestigated to reconstruct past climatic changes throughout the Holocene in conjunction with other marine andpaleoenvironmental records of the region and better constrain the regional paleoclimatic evolutions of SWWs.Samples comprising both a flowstone core and a stalagmite were radiometrically dated (U–Th & 14C) toconstruct age-depth models for the highly-resolved proxy profiles (δ13C, δ18O, chemical composition). TheCueva Chica record provides a highly-resolved isotopic and elemental curves for the last 12 ka, albeit with ahiatus from 5.8 to 4 ka BP. The multi-proxy analysis suggests three climatic regimes throughout the Holocene inSouthern Patagonia: i) an early Holocene wet period (with the exception of two dry excursions at 10.5 ka and 8.5ka BP), ii) a mid-Holocene dry period and iii), a return to generally wet conditions over the late Holocene. Theglobal drivers for these tri-phased climatic regimes are likely related to oceanic and South polar feedbacks. Theearly Holocene was the warmest period and might be attributable to changes in global ocean circulation whichinvolved a rise in air T◦ and a strength in SWW from 50◦S, and therefore higher precipitations over landmass.After 9 ka BP, an intensified deglaciation dynamic along the Antarctic Peninsula is concordant with increasingsummer insolation in the Southern hemisphere, leading to a poleward shift of the SWWs in response to globalwarming and thus to a reduction in moisture supply from the Pacific onto the Patagonian shore. After 5 ka BP, agradual SST decline is consistent with an equatorward shift of the SWWs in response to a cooling Southernhemisphere. The SWW storm tracks extended to lower latitudes, inducing a return to wetter conditions withhighly variable moisture patterns along the Patagonian landmass. Clumped isotope (Δ 47) analyses at lowerresolution reflect the degree of kinetic isotope fractionation at the time of carbonate deposition, especially duringthe dry interval around 8.5–5.5 ka BP. Reduced kinetic isotope fractionation is observed since at least 2.6 ka BP,a period marked by (slightly) wetter conditions.
dc.language.isoENen_US
dc.subject.enHolocene
dc.subject.enSpeleothems
dc.subject.enStable isotopes
dc.subject.enSouthern westerly winds
dc.subject.enPatagonia
dc.title.enHolocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.gloplacha.2023.104050en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnementen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
bordeaux.journalGlobal and Planetary Changeen_US
bordeaux.page104050en_US
bordeaux.volume222en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04287379
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=Global%20and%20Planetary%20Change&rft.date=2023-02-03&rft.volume=222&rft.spage=104050&rft.epage=104050&rft.eissn=0921-8181&rft.issn=0921-8181&rft.au=NEHME,%20Carole&TODISCO,%20Dominique&BREITENBACH,%20Sebastian&COUCHOUD,%20Isabelle&MARCHEGIANO,%20Marta&rft.genre=article


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