Discussion
Which consequence does that isolation have for polar ozone?
Answer: B
Because the vortex is isolated, air depleted of ozone by heterogeneous chemistry on polar stratospheric clouds is not replaced, and the depletion accumulates through the winter and spring. This is why the ozone hole is a southern hemisphere phenomenon, the southern vortex being colder and more isolated than the northern one. Descent does occur but the air remains extremely cold.
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