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The Sahelian agro-ecosystem vulnerability to an acceleration of ice-sheet melting during the 21st century

dc.rights.licenseopenen_US
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorDEFRANCE, Dimitri
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorRAMSTEIN, Gilles
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorCHARBIT, Sylvie
hal.structure.identifierProcessus de la variabilité climatique tropicale et impacts [PARVATI]
dc.contributor.authorSULTAN, Benjamin
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorDUMAS, Christophe
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorVRAC, Mathieu
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSWINGEDOUW, Didier
hal.structure.identifierCultures, Environnements, Arctique, Représentations, Climat [CEARC]
dc.contributor.authorGEMENNE, François
hal.structure.identifierUniversidad Complutense de Madrid = Complutense University of Madrid [Madrid] [UCM]
dc.contributor.authorALVAREZ-SOLAS, Jorge
hal.structure.identifierCultures, Environnements, Arctique, Représentations, Climat [CEARC]
dc.contributor.authorVANDERLINDEN, Jean-Paul
dc.date.accessioned2024-09-27T07:40:57Z
dc.date.available2024-09-27T07:40:57Z
dc.date.issued2016
dc.date.conference2016-04-17
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/201928
dc.description.abstractEnDuring the 20th century, Sahelian drought episodes like those between 1972 and 1982 showed the vulnerability of the Sahelian agro-ecosystem provoking significant intraregional southward human migrations, to or near the coast. According to the latest IPCC report, the Sahel could become increasingly impacted by climate change during the 21st century because of a lagged and shorter rainfall season having the potential to induce a drastic destabilization of the Sahelian agro-ecosystem and to heavily impact the population. Such effects could be further amplified by a net increase of the Sahelian population. Drastic climate changes over tropical areas also occurred in the past: weakening of the West African Monsoon and megadrought Sahelian episodes have been reported with a close correspondence between the large rainfall decrease and the massive freshwater discharges following ice-sheet melting or iceberg surges. During the last decades a continuous acceleration of ice-sheet mass loss has been observed and post IPCC-AR5 studies suggest the ice-sheet contribution to future sea-level rise could be revised upward due partly to the lack of an accurate representation of ice-ocean interactions. The release of freshwater discharge in response to ice-sheet instability could have large consequences on the most vulnerable regions, such as the tropical areas. To investigate the impacts of large ice-sheet instability during the 21st century, we first explore the climatic signature of Greenland or Antarctic ice-sheet collapse scenarios corresponding to 0.5 to 1.5 meter of sea-level rise, superimposed to the RCP8.5 scenario. We show that a freshwater discharge coming from Greenland melting induces a significant decrease of summer monsoon rainfall, that may lead to changes in agricultural practices. Combined with increasing demography, this has the potential to induce important human migration flows. Without adaptation measures, we estimate that tens to hundreds million people could be forced to leave the Sahel by the end of the 21st century, not accounting for the direct migratory impact of sea-level rise over coastal areas.
dc.language.isoENen_US
dc.subjectAfrique
dc.subjectMousson - Afrique
dc.subject.enSahel
dc.subject.enagronomy
dc.subject.enmonsoon
dc.subject.enclimate change
dc.subject.enmigration
dc.title.enThe Sahelian agro-ecosystem vulnerability to an acceleration of ice-sheet melting during the 21st century
dc.typeCommunication dans un congrèsen_US
dc.subject.halSciences de l'environnement/Environnement et Sociétéen_US
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphèreen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
bordeaux.page7977en_US
bordeaux.volume18en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.conference.titleEGU General Assembly 2016en_US
bordeaux.countryaten_US
bordeaux.teamPALEOen_US
bordeaux.conference.cityViennaen_US
bordeaux.import.sourcehal
hal.identifiercea-01494242
hal.version1
hal.invitednonen_US
hal.proceedingsnonen_US
hal.conference.end2016-04-22
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.date=2016&rft.volume=18&rft.spage=7977&rft.epage=7977&rft.au=DEFRANCE,%20Dimitri&RAMSTEIN,%20Gilles&CHARBIT,%20Sylvie&SULTAN,%20Benjamin&DUMAS,%20Christophe&rft.genre=unknown


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