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dc.contributor.authorCheung, Ho Nam
dc.contributor.authorOmrani, Nour-Eddine
dc.contributor.authorOgawa, Fumiaki
dc.contributor.authorKeenlyside, Noel Sebastian
dc.contributor.authorNakamura, Hisashi
dc.contributor.authorZhou, Wen
dc.description.abstractAtmospheric blocking is a crucial driver of extreme weather events, but its climatological frequency is largely underestimated in state-of-the-art climate models, especially around the North Atlantic. While air-sea interaction along the North Atlantic oceanic frontal region is known to influence Atlantic blocking activity, remote effects from the Pacific have been less studied. Here we use semi-idealised experiments with an atmospheric general circulation model to demonstrate that the mid-latitude Pacific oceanic front is crucial for climatological Atlantic blocking activity. The front intensifies the Pacific eddy-driven jet that extends eastward towards the North Atlantic. The eastward-extended Pacific jet reinforces the North Atlantic circulation response to the Atlantic oceanic front, including the storm track activity and the eddy-driven jet. The strengthening of the eddy-driven jet reduces the Greenland blocking frequency. Moreover, the Pacific oceanic front greatly strengthens the stationary planetary-scale ridge in Europe. Together with a stronger northeastward extension of the Atlantic storm track, enhanced interaction between extratropical cyclones and the European ridge favours the occurrence of Euro-Atlantic blocking. Therefore, the North Atlantic circulation response amplified remotely by the Pacific oceanic front substantially increases Euro-Atlantic blocking frequency while decreasing Greenland blocking frequency.en_US
dc.publisherNature Researchen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titlePacific oceanic front amplifies the impact of Atlantic oceanic front on North Atlantic blockingen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2023 the authorsen_US
dc.source.journalnpj Climate and Atmospheric Scienceen_US
dc.identifier.citationnpj Climate and Atmospheric Science. 2023, 6, 61.en_US

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