More-Persistent Weak Stratospheric Polar Vortex States Linked to Cold Extremes

  title={More-Persistent Weak Stratospheric Polar Vortex States Linked to Cold Extremes},
  author={Marlene Kretschmer and Dim Coumou and Laurie Agel and Mathew Barlow and Eli Tziperman and Justin Cohen},
  journal={Bulletin of the American Meteorological Society},
AbstractThe extratropical stratosphere in boreal winter is characterized by a strong circumpolar westerly jet, confining the coldest temperatures at high latitudes. The jet, referred to as the stratospheric polar vortex, is predominantly zonal and centered around the pole; however, it does exhibit large variability in wind speed and location. Previous studies showed that a weak stratospheric polar vortex can lead to cold-air outbreaks in the midlatitudes, but the exact relationships and… 

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