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Which hemisphere shows the stronger and more isolated polar vortex?

  • A.Both equally
  • B.Neither, since the vortex forms only in the hemisphere experiencing summer at the time of the observation
  • C.The southern hemisphere
  • D.The northern hemisphere, where the greater land-sea contrast produces a more vigorous circulation aloft

Answer: C

The southern vortex is colder, stronger and far less disturbed by planetary waves, because the southern hemisphere has weaker stationary wave forcing from topography and land-sea contrast. That is precisely why the ozone hole forms over Antarctica and not over the Arctic. The vortex is a winter feature, forming as the pole enters polar night.

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