Discussion
Which situation gives zero thermal advection despite a strong thermal wind?
Answer: B
When the thermal wind is parallel to the flow, the isotherms are also parallel to the flow, so no temperature is being carried across them. The wind then changes speed but not direction with height. A barotropic layer has no thermal wind at all, which is a different case, and equal speeds at top and bottom would indicate a thermal wind perpendicular to the mean flow and hence maximum advection.
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