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Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic

dc.rights.licenseopenen_US
dc.contributor.authorORTEGA, Pablo
hal.structure.identifierProcessus de la variabilité climatique tropicale et impacts [PARVATI]
hal.structure.identifierOeschger Centre for Climate Change Research [OCCR]
dc.contributor.authorMIGNOT, Juliette
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSWINGEDOUW, Didier
hal.structure.identifierOcean and Earth Science [Southampton]
dc.contributor.authorSÉVELLEC, Florian
hal.structure.identifierNCAS-Climate [Reading]
hal.structure.identifierProcessus de la variabilité climatique tropicale et impacts [PARVATI]
dc.contributor.authorGUILYARDI, Éric
dc.date.accessioned2024-06-03T09:02:23Z
dc.date.available2024-06-03T09:02:23Z
dc.date.issued2015-09
dc.identifier.issn0079-6611en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200209
dc.description.abstractEnUnderstanding the preferential timescales of variability in the North Atlantic, usually associated with the Atlantic meridional overturning circulation (AMOC), is essential for the prospects for decadal prediction. However, the wide variety of mechanisms proposed from the analysis of climate simulations, potentially dependent on the models themselves, has stimulated the debate of which processes take place in reality. One mechanism receiving increasing attention, identified both in idealized models and observations, is a westward propagation of subsurface buoyancy anomalies that impact the AMOC through a basin-scale intensification of the zonal density gradient, enhancing the northward transport via thermal wind balance. In this study, we revisit a control simulation from the Institut Pierre-Simon Laplace Coupled Model 5A (IPSL-CM5A), characterized by a strong AMOC periodicity at 20 years, previously explained by an upper ocean–atmosphere–sea ice coupled mode driving convection activity south of Iceland. Our study shows that this mechanism interacts constructively with the basin-wide propagation in the subsurface. This constructive feedback may explain why bi-decadal variability is so intense in this coupled model as compared to others.
dc.description.sponsorshipOscillations et rétroactions climatiques aux échelles décennales : mécanismes, sensibilité et incertitudes - ANR-13-SENV-0002en_US
dc.language.isoENen_US
dc.title.enReconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.pocean.2015.06.009en_US
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphèreen_US
dc.subject.halPhysique [physics]/Physique [physics]/Géophysique [physics.geo-ph]en_US
dc.description.sponsorshipEuropeSeasonal-to-decadal climate Prediction for the improvement of EuropeanClimate Servicesen_US
bordeaux.journalProgress in Oceanographyen_US
bordeaux.page237–249en_US
bordeaux.volume137en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issuePart Aen_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01176201
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=Progress%20in%20Oceanography&rft.date=2015-09&rft.volume=137&rft.issue=Part%20A&rft.spage=237%E2%80%93249&rft.epage=237%E2%80%93249&rft.eissn=0079-6611&rft.issn=0079-6611&rft.au=ORTEGA,%20Pablo&MIGNOT,%20Juliette&SWINGEDOUW,%20Didier&S%C3%89VELLEC,%20Florian&GUILYARDI,%20%C3%89ric&rft.genre=article


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