Evidence linking Arctic amplification to extreme weather in mid‐latitudes

  title={Evidence linking Arctic amplification to extreme weather in mid‐latitudes},
  author={Jennifer A. Francis and Stephen J. Vavrus},
  journal={Geophysical Research Letters},
Arctic amplification (AA) – the observed enhanced warming in high northern latitudes relative to the northern hemisphere – is evident in lower‐tropospheric temperatures and in 1000‐to‐500 hPa thicknesses. Daily fields of 500 hPa heights from the National Centers for Environmental Prediction Reanalysis are analyzed over N. America and the N. Atlantic to assess changes in north‐south (Rossby) wave characteristics associated with AA and the relaxation of poleward thickness gradients. Two effects… 
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Evidence linking rapid Arctic warming to mid-latitude weather patterns
  • J. Francis, N. Skific
  • Environmental Science
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2015
New metrics and evidence are presented that suggest disproportionate Arctic warming—and resulting weakening of the poleward temperature gradient—is causing the Northern Hemisphere circulation to assume a more meridional character (i.e. wavier), although not uniformly in space or by season, and that highly amplified jet-stream patterns are occurring more frequently.
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