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dc.contributor.authorÅrthun, Marius
dc.contributor.authorWills, Robert C.J.
dc.contributor.authorJohnson, Helen L.
dc.contributor.authorChafik, Leon
dc.contributor.authorLangehaug, Helene R.
dc.description.abstractDecadal sea surface temperature (SST) fluctuations in the North Atlantic Ocean influence climate over adjacent land areas and are a major source of skill in climate predictions. However, the mechanisms underlying decadal SST variability remain to be fully understood. This study isolates the mechanisms driving North Atlantic SST variability on decadal time scales using low-frequency component analysis, which identifies the spatial and temporal structure of low-frequency variability. Based on observations, large ensemble historical simulations, and preindustrial control simulations, we identify a decadal mode of atmosphere–ocean variability in the North Atlantic with a dominant time scale of 13–18 years. Large-scale atmospheric circulation anomalies drive SST anomalies both through contemporaneous air–sea heat fluxes and through delayed ocean circulation changes, the latter involving both the meridional overturning circulation and the horizontal gyre circulation. The decadal SST anomalies alter the atmospheric meridional temperature gradient, leading to a reversal of the initial atmospheric circulation anomaly. The time scale of variability is consistent with westward propagation of baroclinic Rossby waves across the subtropical North Atlantic. The temporal development and spatial pattern of observed decadal SST variability are consistent with the recent observed cooling in the subpolar North Atlantic. This suggests that the recent cold anomaly in the subpolar North Atlantic is, in part, a result of decadal SST variability.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleMechanisms of decadal North Atlantic climate variability and implications for the recent cold anomalyen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2021 American Meteorological Societyen_US
dc.source.journalJournal of Climateen_US
dc.relation.projectTrond Mohn stiftelse: BFS2018TMT01en_US
dc.relation.projectNorges forskningsråd: 263223en_US
dc.relation.projectNorges forskningsråd: 310392en_US
dc.identifier.citationJournal of Climate. 2021, 34 (9), 3421-3439.en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal