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African monsoon enhancement during the penultimate glacial period (MIS 6.5~ 170 ka) and its atmospheric impact

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorTISSERAND, Amandine
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMALAIZE, Bruno
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorJULLIEN, Elsa
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCHARLIER, Karine
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGROUSSET, Francis
dc.date.accessioned2024-10-25T11:38:35Z
dc.date.available2024-10-25T11:38:35Z
dc.date.issued2009-06-01
dc.identifier.issn0883-8305en_US
dc.identifier.urihttps://www.researchgate.net/publication/228660260_African_monsoon_enhancement_during_the_penultimate_glacial_period_MIS_65_170_ka_and_its_atmospheric_impact
dc.identifier.urioai:crossref.org:10.1029/2008pa001630
dc.identifier.urioai:researchgate.net:228660260
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/202812
dc.description.abstractEn1] A reconstruction of northwest African summer monsoon strength during the cold marine isotopic stage (MIS) 6 indicates a link to the seasonal migration of the Intertropical Convergence Zone (ITCZ). High-resolution studies of eolian dust supply and sea surface temperature recorded in marine core MD03-2705, on the Mauritanian margin, provide a better understanding about the penultimate glacial history of northwestern African aridity/humidity and upwelling coastal activity. Today, site MD03-2705 experiences increased upwelling and dust flux during the winter months, when the ITCZ is in a southerly position. Analyses of foraminifera isotopic composition suggest that during MIS 6.5 (180–168 ka) the average position of the ITCZ migrated north, marked by an increase in the strength of the summer monsoon, which decreased eolian dust transport and the coastal upwelling activity. The northward migration is in phase with a specific orbital combination of a low precessional index with a high obliquity signal. High-resolution analysis of stable isotopes (d 18 O and d 13 C) and microscale resolution geochemical (Ti/Al and quartz grain counts) determinations reveal that the transition between monsoonal humid (MIS 6.5) and dry (MIS 6.4) conditions has occurred in less than 1.3 ka. Such rapid changes suggest a nonlinear link between the African monsoonal rainfall system and environmental changes over the continent. This study provides new insights about the influence of vegetation and oceanic temperature feedbacks on the onset of African summer monsoon and demonstrates that, during the penultimate glacial period, changes in tropical dynamics had regional and global impacts.
dc.language.isoENen_US
dc.sourcecrossref
dc.sourceresearchgate
dc.title.enAfrican monsoon enhancement during the penultimate glacial period (MIS 6.5~ 170 ka) and its atmospheric impact
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2008pa001630en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalPaleoceanographyen_US
bordeaux.pagen/a-n/aen_US
bordeaux.volume24en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04753619
hal.version1
hal.date.transferred2024-10-25T11:38:37Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
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dc.rights.ccPas de Licence CCen_US
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