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dc.rights.licenseopenen_US
dc.contributor.authorDELCROIX, T.
dc.contributor.authorMICHEL, S. L. L.
dc.contributor.authorSWINGEDOUW, D.
dc.contributor.authorMALAIZÉ, B.
dc.contributor.authorDANIAU, A.-L.
dc.contributor.authorABARCA-DEL-RIO, R.
dc.contributor.authorCALEY, T.
dc.contributor.authorSÉMAH, A.-M.
dc.date.accessioned2023-03-15T08:53:01Z
dc.date.available2023-03-15T08:53:01Z
dc.date.issued2022-12-05
dc.identifier.issn2572-4525en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/172314
dc.description.abstractEnEl Niño Southern Oscillation (ENSO) events yield precipitation deficits and ensuing droughts, often damaging regional forests, in many parts of the world. The relative roles of ENSO, other natural climate changes, and anthropogenic factors on the forest clearing of Easter Island over the last millennium are still debated. Here, we analyze Easter Island precipitation changes using in situ, satellite-derived and reanalysis products spanning the last 4–7 decades, and 46 monthly 156-year-long (1850–2014) simulations derived from 25 CMIP5 and 21 CMIP6 (Coupled Model Intercomparison Project phases 5 and 6) General Circulation Models. Our analysis shows that La Niña events, the cold phases of ENSO, cause precipitation deficits of −0.2 to −0.3 standard deviation (relative to long-term mean) in all analyzed data types. ENSO-like events are further examined over the last millennium (850–1981). A new multiproxy reconstruction of the NINO3.4 index based on proxy records from the Past Global Changes 2k database and Random Forest method is produced. Our reconstruction reveals unusual high recurrences of La Niña-like situations during the fifteenth to seventeenth centuries, which likely induced significant precipitation deficits on the island. These situations are compared to published vegetation reconstructions based on pollen analyses derived from sedimentary cores collected in three island sites. We conclude the environmental consequences of cumulative precipitation deficits over long-lasting La Niña-like situations reconstructed here over the fifteenth to seventeenth centuries were likely favoring drought and forest flammability. La Niña events should be better accounted for among the causes of forest clearing on Easter Island.
dc.language.isoENen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.title.enClarifying the Role of ENSO on Easter Island Precipitation Changes: Potential Environmental Implications for the Last Millennium
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2022PA004514en_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.issue12en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-04029673
hal.version1
hal.date.transferred2023-03-15T08:53:06Z
hal.exporttrue
dc.rights.ccCC BY-NC-NDen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Paleoceanography%20and%20Paleoclimatology&rft.date=2022-12-05&rft.volume=37&rft.issue=12&rft.eissn=2572-4525&rft.issn=2572-4525&rft.au=DELCROIX,%20T.&MICHEL,%20S.%20L.%20L.&SWINGEDOUW,%20D.&MALAIZ%C3%89,%20B.&DANIAU,%20A.-L.&rft.genre=article


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