Daily to decadal modulation of jet variability
Lee, Robert W.
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KeywordAtmospheric circulation; Jets; North Atlantic Oscillation; Baroclinic models; Decadal variability
The variance of a jet’s position in latitude is found to be related to its average speed: when a jet becomes stronger, its variability in latitude decreases. This relationship is shown to hold for observed midlatitude jets around the world and also across a hierarchy of numerical models. North Atlantic jet variability is shown to be modulated on decadal time scales, with decades of a strong, steady jet being interspersed with decades of a weak, variable jet. These modulations are also related to variations in the basinwide occurrence of high-impact blocking events. A picture emerges of complex multidecadal jet variability in which recent decades do not appear unusual. An underlying barotropic mechanism is proposed to explain this behavior, related to the change in refractive properties of a jet as it strengthens, and the subsequent effect on the distribution of Rossby wave breaking.
Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 30 (2018): 1297-1314, doi:10.1175/JCLI-D-17-0286.1.
Suggested CitationArticle: Woollings, Tim, Barnes, Elizabeth, Hoskins, Brian, Kwon, Young-Oh, Lee, Robert W., Li, Camille, Madonna, Erica, McGraw, Marie, Parker, Tess, Rodrigues, Regina, Spensberger, Clemens, Williams, Keith, "Daily to decadal modulation of jet variability", Journal of Climate 30 (2018): 1297-1314, DOI:10.1175/JCLI-D-17-0286.1, https://hdl.handle.net/1912/9634
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