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Wintertime North American weather regimes and the Arctic stratospheric polar vortex

Lee, S. H., Furtado, J. C. and Charlton-Perez, A. J. (2020) Wintertime North American weather regimes and the Arctic stratospheric polar vortex. Geophysical Research Letters, 46 (24). pp. 14892-14900. ISSN 0094-8276

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To link to this item DOI: 10.1029/2019GL085592

Abstract/Summary

The impact of the Arctic stratospheric polar vortex on persistent weather regimes over North America is so far under-explored. Here we show the relationship between four wintertime North American weather regimes and the stratospheric vortex strength using reanalysis data. We find that the strength of the vortex significantly affects the behavior of the regimes. Whilst a regime associated with Greenland blocking is strongly favored following weak vortex events, it is not the primary regime associated with a widespread, elevated risk of extreme cold in North America. Instead, we find that the regime most strongly associated with widespread extremely cold weather does not show a strong dependency on the strength of the lower-stratospheric zonal-mean zonal winds. We also suggest that stratospheric vortex morphology may be particularly important for cold air outbreaks during this regime.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:87746
Publisher:American Geophysical Union

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