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20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments

dc.rights.licenseopenen_US
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorREVEL, Marie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUCASSOU, Emmanuelle
dc.contributor.authorSKONIECZNY, C.
hal.structure.identifierGéosciences Paris Sud [GEOPS]
dc.contributor.authorCOLIN, C.
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorBASTIAN, L.
hal.structure.identifierGéosciences Montpellier
dc.contributor.authorBOSCH, Delphine
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorMIGEON, S.
hal.structure.identifierObservatoire océanologique de Villefranche-sur-mer [OOVM]
dc.contributor.authorMASCLE, J.
dc.date.accessioned2024-06-04T14:22:43Z
dc.date.available2024-06-04T14:22:43Z
dc.date.issued2015-12-15
dc.identifier.issn0277-3791en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200260
dc.description.abstractEnMulti-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation and erosion in the Nile headwaters. Sediment element composition and neodymium isotopic composition reveal significant changes in clastic sediment provenance, with sources oscillating between a Saharan aeolian contribution during the Last Glacial Maximum/deglacial transition and during the Late Holocene, and a Blue/Atbara Nile fluvial contribution during the African Humid Period (AHP). This study provides a new understanding of past environmental changes. Between 14.6 and 14.13 ka there was a major input of sediments from the Ethiopian Highlands, consistent with a stronger EAM at that time. Climate in the Nile basin was wetter between 14.8 and 8.4 ka, with a corresponding increase in Blue Nile water and sediment discharge via the main Nile into the Eastern Mediterranean. The gradual climatic transition from the AHP to the present-day dry climate was reflected in a decrease in Blue Nile sediment deposition and flood discharge between 8.4 and 3.7 ka, with aridity at a maximum between 3.7 and 2.6 ka. The onset of drier conditions in the Blue Nile basin seems to have begun before the 8.2 ka cooling event in the North Atlantic. We speculate that the climatic change from the wet AHP to the dry late Holocene may have been a result of a break in the low latitude dynamic equilibrium between climate, vegetation and erosion, which may in turn have affected the climate in higher latitudes. Reduced Nile flow may also have had an impact on Levantine Intermediate Water originating in the Eastern Mediterranean through an increase in intermediate water formation.
dc.language.isoENen_US
dc.subject.enWestern Nile upper continental slope sediments
dc.subject.enEast African monsoon
dc.subject.enNile river
dc.subject.enPalaeohydrology
dc.subject.enNeodymium and oxygen isotopes
dc.subject.enMajor elements
dc.subject.enHolocene
dc.subject.enLast deglaciation
dc.title.en20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.quascirev.2015.10.030en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
bordeaux.journalQuaternary Science Reviewsen_US
bordeaux.page200-221en_US
bordeaux.volume130en_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-01277950
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=2015-12-15&rft.volume=130&rft.spage=200-221&rft.epage=200-221&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=REVEL,%20Marie&DUCASSOU,%20Emmanuelle&SKONIECZNY,%20C.&COLIN,%20C.&BASTIAN,%20L.&rft.genre=article


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