The association between stratospheric weak polar vortex events and cold air outbreaks in the Northern Hemisphere

  title={The association between stratospheric weak polar vortex events and cold air outbreaks in the Northern Hemisphere},
  author={E. Kolstad and T. Breiteig and A. Scaife},
  journal={Quarterly Journal of the Royal Meteorological Society},
Previous studies have identified an association between temperature anomalies in the Northern Hemisphere and the strength of stratospheric polar westerlies. Large regions in northern Asia, Europe and North America have been found to cool during the mature and late stages of weak vortex events in the stratosphere. A substantial part of the temperature changes are associated with changes in the Northern Annular Mode (NAM) and North Atlantic Oscillation (NAO) pressure patterns in the troposphere… Expand
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