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Understanding AMOC stability: the North Atlantic Hosing Model Intercomparison Project

dc.rights.licenseopenen_US
dc.contributor.authorJACKSON, Laura
dc.contributor.authorALASTRUÉ DE ASENJO, Eduardo
dc.contributor.authorBELLOMO, Katinka
dc.contributor.authorDANABASOGLU, Gokhan
dc.contributor.authorHAAK, Helmuth
dc.contributor.authorHU, Aixue
dc.contributor.authorJUNGCLAUS, Johann
dc.contributor.authorLEE, Warren
dc.contributor.authorMECCIA, Virna
dc.contributor.authorSAENKO, Oleg
dc.contributor.authorSHAO, Andrew
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSWINGEDOUW, Didier
dc.date.accessioned2024-01-29T12:58:42Z
dc.date.available2024-01-29T12:58:42Z
dc.date.issued2023-04-06
dc.identifier.issn1991-9603en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187592
dc.description.abstractEnAbstract. The Atlantic meridional overturning circulation (AMOC) is an important part of our climate system. The AMOC is predicted to weaken under climate change; however, theories suggest that it may have a tipping point beyond which recovery is difficult, hence showing quasi-irreversibility (hysteresis). Although hysteresis has been seen in simple models, it has been difficult to demonstrate in comprehensive global climate models. Here, we outline a set of experiments designed to explore AMOC hysteresis and sensitivity to additional freshwater input as part of the North Atlantic Hosing Model Intercomparison Project (NAHosMIP). These experiments include adding additional freshwater (hosing) for a fixed length of time to examine the rate and mechanisms of AMOC weakening and whether the AMOC subsequently recovers once hosing stops. Initial results are shown from eight climate models participating in the Sixth Coupled Model Intercomparison Project (CMIP6). The AMOC weakens in all models as a result of the freshening, but once the freshening ceases, the AMOC recovers in half of the models, and in the other half it stays in a weakened state. The difference in model behaviour cannot be explained by the ocean model resolution or type nor by details of subgrid-scale parameterisations. Likewise, it cannot be explained by previously proposed properties of the mean climate state such as the strength of the salinity advection feedback. Instead, the AMOC recovery is determined by the climate state reached when hosing stops, with those experiments where the AMOC is weakest not experiencing a recovery.
dc.language.isoENen_US
dc.title.enUnderstanding AMOC stability: the North Atlantic Hosing Model Intercomparison Project
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/gmd-16-1975-2023en_US
dc.subject.halPlanète et Univers [physics]en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalGeoscientific Model Developmenten_US
bordeaux.page1975-1995en_US
bordeaux.volume16en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue7en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04291950
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=Geoscientific%20Model%20Development&rft.date=2023-04-06&rft.volume=16&rft.issue=7&rft.spage=1975-1995&rft.epage=1975-1995&rft.eissn=1991-9603&rft.issn=1991-9603&rft.au=JACKSON,%20Laura&ALASTRU%C3%89%20DE%20ASENJO,%20Eduardo&BELLOMO,%20Katinka&DANABASOGLU,%20Gokhan&HAAK,%20Helmuth&rft.genre=article


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