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Which season shows the greatest Antarctic ozone depletion?

  • A.Autumn, as the vortex begins to form and the first polar stratospheric clouds appear over the continent
  • B.Spring
  • C.Midwinter, when the polar stratosphere reaches its coldest temperatures and the clouds are most extensive
  • D.Summer

Answer: B

The chemistry requires sunlight to photolyse the activated chlorine, so although the clouds form in midwinter darkness the ozone loss occurs rapidly once the sun returns in September and October. By December the vortex breaks down and ozone rich air is mixed in. The sequence of cold, then activation, then sunlight, then loss is worth following through in order.

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