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dc.contributor.authorMadonna, Erica
dc.contributor.authorLi, Camille
dc.contributor.authorWettstein, Justin
dc.PublishedMadonna E, Li C, Wettstein J. Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales. Atmospheric Science Letters. 2019;20:e937eng
dc.description.abstractJet streams shape midlatitude weather and climate. The North Atlantic jet is mainly eddy‐driven, with frequent north–south excursions on synoptic time scales arising from eddy forcings and feedbacks. There are, however, special periods during which the underlying dynamics appear to change—for example, winter 2009/2010, when the jet was persistently southward‐shifted, extremely zonal, and more thermally driven. This study shows evidence that the southern jet configuration exhibits altered dynamical behavior involving a shift in the balance of thermal and eddy‐driving processes, independent of timescale. Specifically, southern jets exhibit weaker eddy feedbacks and are associated with enhanced heating in the tropical Pacific. During winter 2009/2010, a remarkably frequent (66 days out of the 90‐day winter season) and persistent southern jet shaped the unusual seasonal signature. These results bridge the synoptic and climate perspectives of jet variability, with potential to help understand and reduce biases in regional climate variability as simulated by models.en_US
dc.rightsAttribution CC BYeng
dc.subjectclimate variabilityeng
dc.subjecteddy-mean flow interactionseng
dc.subjectJet streameng
dc.subjectNorth Atlanticeng
dc.titleSuppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scalesen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.source.journalAtmospheric Science Letters
dc.relation.projectNorges forskningsråd: 255027
dc.relation.projectNorges forskningsråd: 231716

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