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dc.contributor.authorOmrani, Nour-Eddine
dc.contributor.authorOgawa, Fumiaki
dc.contributor.authorNakamura, Hisashi
dc.contributor.authorKeenlyside, Noel
dc.contributor.authorLubis, Sandro W.
dc.contributor.authorMatthes, Katja
dc.PublishedOmrani N, Ogawa F, Nakamura H, Keenlyside N, Lubis SW, Matthes K. Key Role of the Ocean Western Boundary currents in shaping the Northern Hemisphere climate. Scientific Reports. 2019;9:3014eng
dc.description.abstractThe individual impact of North Atlantic and Pacific Ocean Western Boundary Currents (OWBCs) on the tropospheric circulation has recently been studied in depth. However, their simultaneous role in shaping the hemisphere-scale wintertime troposphere/stratosphere-coupled circulation and its variability have not been considered. Through semi-idealized Atmospheric General-Circulation-Model experiments, we show that the North Atlantic and Pacific OWBCs jointly maintain and shape the wintertime hemispheric circulation and its leading mode of variability Northern Annular Mode (NAM). The OWBCs energize baroclinic waves that reinforce quasi-annular hemispheric structure in the tropospheric eddy-driven jetstreams and NAM variability. Without the OWBCs, the wintertime NAM variability is much weaker and its impact on the continental and maritime surface climate is largely insignificant. Atmospheric energy redistribution caused by the OWBCs acts to damp the near-surface atmospheric baroclinicity and compensates the associated oceanic meridional energy transport. Furthermore, the OWBCs substantially weaken the wintertime stratospheric polar vortex by enhancing the upward planetary wave propagation, and thereby affecting both stratospheric and tropospheric NAM-annularity. Whereas the overall impact of the extra-tropical OWBCs on the stratosphere results mainly from the Pacific, the impact on the troposphere results from both the Pacific and Atlantic OWBCs.en_US
dc.publisherNature Researchen_US
dc.rightsAttribution CC BYeng
dc.titleKey Role of the Ocean Western Boundary currents in shaping the Northern Hemisphere climateen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.source.journalScientific Reports
dc.relation.projectNotur/NorStore: NS9064K

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