Discussion
Which reversal above the tropopause weakens the westerlies?
Answer: D
In the lower stratosphere the polar region is warmer than the tropics, because the tropical tropopause is much higher and therefore much colder, so the thermal wind reverses to easterly. Integrating that reversed shear upward reduces the westerly wind above the jet core. The Coriolis parameter does not change sign within a hemisphere, and the geostrophic relation remains perfectly valid in the stratosphere.
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