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Past African dust inputs in the western Mediterranean area controlled by the complex interaction between the intertropical convergence zone, the North Atlantic oscillation, and total solar irradiance

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorSABATIER, Pierre
hal.structure.identifierMorphodynamique Continentale et Côtière [M2C]
dc.contributor.authorNICOLLE, Marie
hal.structure.identifierLaboratoire de Chimie Moléculaire et Environnement [LCME]
dc.contributor.authorPIOT, Christine
hal.structure.identifierGéosciences Paris Saclay [GEOPS]
dc.contributor.authorCOLIN, Christophe
hal.structure.identifierMorphodynamique Continentale et Côtière [M2C]
dc.contributor.authorDEBRET, Maxime
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSWINGEDOUW, Didier
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorPERRETTE, Yves
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
hal.structure.identifierLaboratoire de Chimie Moléculaire et Environnement [LCME]
dc.contributor.authorBELLINGERY, Marie-Charlotte
hal.structure.identifierLaboratoire Chimie de l'environnement [LCE]
dc.contributor.authorCHAZEAU, Benjamin
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorDEVELLE, Anne-Lise
hal.structure.identifierGéosciences Paris Saclay [GEOPS]
dc.contributor.authorLEBLANC, Maxime
hal.structure.identifierGéosciences Paris Saclay [GEOPS]
dc.contributor.authorSKONIECZNY, Charlotte
hal.structure.identifierMorphodynamique Continentale et Côtière [M2C]
dc.contributor.authorCOPARD, Yoann
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
hal.structure.identifierOcéan et Interfaces [OCEANIS]
dc.contributor.authorREYSS, Jean-Louis
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorMALET, Emmanuel
hal.structure.identifierLaboratoire Chrono-environnement (UMR 6249) [LCE]
dc.contributor.authorJOUFFROY-BAPICOT, Isabelle
hal.structure.identifierUniversità di Corsica Pasquale Paoli [Université de Corse Pascal Paoli]
dc.contributor.authorKELNER, Maëlle
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorPOULENARD, Jérôme
hal.structure.identifierLaboratoire Chrono-environnement (UMR 6249) [LCE]
dc.contributor.authorDIDIER, Julien
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorARNAUD, Fabien
hal.structure.identifierLaboratoire Chrono-environnement (UMR 6249) [LCE]
dc.contributor.authorVANNIÈRE, Boris
dc.date.accessioned2024-04-10T09:28:22Z
dc.date.available2024-04-10T09:28:22Z
dc.date.issued2020-02-07
dc.identifier.issn1814-9324en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/197404
dc.description.abstractEnNorth Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation Lake Bastani, on the island of Corsica, to reconstruct past African dust inputs to the western Mediterranean area over the last 3150 cal BP. Clay mineralogy with palygorskite and a clay ratio associated with geochemical data allow us to determine that terrigenous fluxes are almost exclusively related to atmospheric dust deposition from the western Sahara and Sahel areas over this period. High-resolution geochemical contents provide a reliable proxy for Saharan dust inputs with long-term (millennial) to short-term (centennial) variations. Millennial variations have been correlated with the long-term southward migration of the Intertropical Convergence Zone (ITCZ), with an increase in dust input since 1070 cal BP. This correlation suggests a strong link with the ITCZ and could reflect the increased availability of dust sources to be mobilized with an increase in wind and a decrease in precipitation over western and North Africa. For centennial to decadal variations, wavelet analyses show that since 1070 cal BP, the North Atlantic Oscillation (NAO) has been the main climatic forcing, with an increase in Saharan dust input during the positive phase, as suggested by previous studies over the last decades. However, when the ITCZ is in a northern position, before 1070 cal BP, wavelet analyses indicate that total solar irradiance (TSI) is the main forcing factor, with an increase in African dust input during low TSI. With climate reanalysis over the instrumental era, during low TSI we observe a significant negative anomaly in pressure over Africa, which is known to increase the dust transport. These two climatic forcing factors (NAO, TSI) modulate Saharan dust inputs to the Mediterranean area at a centennial timescale through changes in wind and transport pathways.
dc.language.isoENen_US
dc.title.enPast African dust inputs in the western Mediterranean area controlled by the complex interaction between the intertropical convergence zone, the North Atlantic oscillation, and total solar irradiance
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/cp-16-283-2020en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
dc.subject.halPhysique [physics]/Physique [physics]/Physique Atmosphérique et Océanique [physics.ao-ph]en_US
bordeaux.journalClimate of the Pasten_US
bordeaux.page283-298en_US
bordeaux.volume16en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02485682
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Climate%20of%20the%20Past&rft.date=2020-02-07&rft.volume=16&rft.issue=1&rft.spage=283-298&rft.epage=283-298&rft.eissn=1814-9324&rft.issn=1814-9324&rft.au=SABATIER,%20Pierre&NICOLLE,%20Marie&PIOT,%20Christine&COLIN,%20Christophe&DEBRET,%20Maxime&rft.genre=article


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