Rotation of mid-latitude binary cyclones: a potential vorticity approach

  title={Rotation of mid-latitude binary cyclones: a potential vorticity approach},
  author={Baruch Ziv and Pinhas Alpert},
  journal={Theoretical and Applied Climatology},
  • B. Ziv, P. Alpert
  • Published 20 November 2003
  • Environmental Science, Physics
  • Theoretical and Applied Climatology
Summary¶Two cyclonic vortices close to each other, a ‘binary cyclone’ or ‘binary system’, tend to rotate cyclonically relative to one another and to merge, i.e. the “Fujiwhara effect”. The point vortex model that represents barotropic binary cyclones predicts their rotation features as follows. The rotation rate is proportional linearly to the sum of the cyclones’ intensities and inversely to the square of their separation distance while the more intense cyclone rotates slower. Our earlier… 

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