Discussion
Which term describes the wind change across a layer in which the temperature gradient reverses?
Answer: D
Since the thermal wind is proportional to the local horizontal temperature gradient, a reversal of that gradient reverses the sign of the shear at the same level. This is exactly what happens at the tropopause, where westerly shear below gives way to easterly shear above and the wind consequently reaches a maximum. Cancellation would occur only in the integrated wind change, and then only if the two contributions happened to be equal.
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