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dc.contributor.authorallDe Cetlogon, G.; Centre d’Etude Terrestre et Planétaire, IUT de Vélizy, Vélizy, Franceen
dc.contributor.authorallFrankignoul, C.; Laboratoire d’Océanographie Dynamique et de Climatologie, Université Pierre et Marie Curie, Paris, Franceen
dc.contributor.authorallBentsen, M.; Nansen Environmental and Remote Sensing Center, Bergen, Norwayen
dc.contributor.authorallDelon, C.; Laboratoire d’Aérologie, Observatoire Midi Pyrénées, Toulouse, Franceen
dc.contributor.authorallHaak, H.; Max Planck Institute for Meteorology, Hamburg, Germanyen
dc.contributor.authorallMasina, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.authorallPardaens, A.; Hadley Centre for Climate Prediction and Research, Met Office, Exeter, United Kingdomen
dc.description.abstractFive non-eddy-resolving oceanic general circulation models driven by atmospheric fluxes derived from the NCEP reanalysis are used to investigate the link between the Gulf Stream (GS) variability, the atmospheric circulation, and the Atlantic meridional overturning circulation (AMOC). Despite the limited model resolution, the temperature at the 200-m depth along the mean GS axis behaves similarly in most models to that observed, and it is also well correlated with the North Atlantic Oscillation (NAO), indicating that a northward (southward) GS shift lags a positive (negative) NAO phase by 0–2 yr. The northward shift is accompanied by an increase in the GS transport, and conversely the southward shift with a decrease in the GS transport. Two dominant time scales appear in the response of the GS transport to the NAO forcing: a fast time scale (less than 1 month) for the barotropic component, and a slower one (about 2 yr) for the baroclinic component. In addition, the two components are weakly coupled. The GS response seems broadly consistent with a linear adjustment to the changes in the wind stress curl, and evidence for baroclinic Rossby wave propagation is found in the southern part of the subtropical gyre. However, the GS shifts are also affected by basin-scale changes in the oceanic conditions, and they are well correlated in most models with the changes in the AMOC. A larger AMOC is found when the GS is stronger and displaced northward, and a higher correlation is found when the observed changes of the GS position are used in the comparison. The relation between the GS and the AMOC could be explained by the inherent coupling between the thermohaline and the wind-driven circulation, or by the NAO variability driving them on similar time scales in the models.en
dc.description.sponsorshipThis research was supported by the PREDICATE project of the European Community, and for M. Bentsen by the Research Council of Norway through RegClim, NOClim, and the Programme of Supercomputing.en
dc.publisher.nameAmerican Meteorological Societyen
dc.relation.ispartofJournal of Physical Oceanographyen
dc.subjectocean modellingen
dc.subjectgulf stream variabilityen
dc.titleGulf Stream Variability in Five Oceanic General Circulation Modelsen
dc.subject.INGV03. Hydrosphere::03.01. General::03.01.03. Global climate modelsen
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dc.description.obiettivoSpecifico3.7. Dinamica del clima e dell'oceanoen
dc.description.journalTypeJCR Journalen
dc.contributor.authorDe Cetlogon, G.en
dc.contributor.authorFrankignoul, C.en
dc.contributor.authorBentsen, M.en
dc.contributor.authorDelon, C.en
dc.contributor.authorHaak, H.en
dc.contributor.authorMasina, S.en
dc.contributor.authorPardaens, A.en
dc.contributor.departmentCentre d’Etude Terrestre et Planétaire, IUT de Vélizy, Vélizy, Franceen
dc.contributor.departmentLaboratoire d’Océanographie Dynamique et de Climatologie, Université Pierre et Marie Curie, Paris, Franceen
dc.contributor.departmentNansen Environmental and Remote Sensing Center, Bergen, Norwayen
dc.contributor.departmentLaboratoire d’Aérologie, Observatoire Midi Pyrénées, Toulouse, Franceen
dc.contributor.departmentMax Planck Institute for Meteorology, Hamburg, Germanyen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.departmentHadley Centre for Climate Prediction and Research, Met Office, Exeter, United Kingdomen
item.fulltextWith Fulltext-
crisitem.classification.parent03. Hydrosphere-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia- d’Etude Terrestre et Planétaire, IUT de Vélizy, Vélizy, France- Res Ltd, Uni Climate, Bergen, Norway- d’Aérologie, Observatoire Midi Pyrénées, Toulouse, France- Planck Institute for Meteorology, Hamburg, Germany- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia- Centre for Climate Prediction and Research, Met Office, Exeter, United Kingdom- Nazionale di Geofisica e Vulcanologia-
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