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Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands

dc.rights.licenseopenen_US
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorMOLOGNI, Carlo
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorREVEL, Marie
hal.structure.identifierAGROCAMPUS OUEST
dc.contributor.authorBLANCHET, Cécile
hal.structure.identifierGéosciences Montpellier
dc.contributor.authorBOSCH, Delphine
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorDEVELLE, Anne-Lise
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorBASTIAN, Luc
hal.structure.identifierCulture et Environnements, Préhistoire, Antiquité, Moyen-Age [CEPAM]
dc.contributor.authorKHALIDI, Lamya
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUCASSOU, Emmanuelle
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorMIGEON, Sébastien
dc.contributor.authorORANGE, François
dc.date.accessioned2024-02-05T16:45:33Z
dc.date.available2024-02-05T16:45:33Z
dc.date.issued2020-11
dc.identifier.issn0277-3791en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187849
dc.description.abstractEnClimate conditions in Africa have varied substantially during the Late Quaternary with alternating humid and arid periods controlled mainly by the African monsoonal regime. However, the duration and termination of the last African Humid Period (14–6 ka BP) and its internal climatic variability are still debated. Using a laminated sequence from the Nile Deep-Sea Fan, we reconstruct for the first time the monsoon-induced frequency of exceptional Nile floods at centennial resolution during the African Humid Period. By combining sedimentological, geochemical and microscopic tools and comparing our record with two proximal piston cores and with regional paleoclimatic records, we show: a) the occurrence of recurrent high-energy floods between 10.1 and 9 ka BP, during the height of the African Humid Period; b) a shift in the hydro-climatic regime as early as 9 ka BP, with a progressive reduction in flood frequency and magnitude until 8.2 ka BP, likely related to a southward migration of the monsoon rainfall belt; c) a drastic reduction of flood activity between 8.2 and 7.8 ka BP; d) an unstable Ethiopian-Nile hydrological system from 7.8 ka BP, followed by a further decrease in river runoff until ∼4 ka BP. The occurrence of a stepwise hydro-climatic deterioration over the Ethiopian Highlands from ∼9 ka BP brings into question the climatic linkages and feedbacks between low and high latitudes during the Early to Mid-Holocene and in particular around the 8.2 ka BP North Atlantic cooling event. Our unique record of flood frequency at centennial-resolution therefore allows us to draw new insights on fluvial and geomorphic feedbacks of the Nile hydrologic system to monsoonal regimes during a period of major environmental shifts.
dc.language.isoENen_US
dc.title.enFrequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.quascirev.2020.106543en_US
dc.subject.halSciences de l'Homme et Sociétéen_US
dc.subject.halSciences du Vivant [q-bio]en_US
dc.subject.halSciences de l'Homme et Société/Archéologie et Préhistoireen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géomorphologieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Stratigraphieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terreen_US
bordeaux.journalQuaternary Science Reviewsen_US
bordeaux.page106543en_US
bordeaux.volume247en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamSEDIMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02929747
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=2020-11&rft.volume=247&rft.spage=106543&rft.epage=106543&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=MOLOGNI,%20Carlo&REVEL,%20Marie&BLANCHET,%20C%C3%A9cile&BOSCH,%20Delphine&DEVELLE,%20Anne-Lise&rft.genre=article


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