Discussion
Which sense of thermal advection forces ascent?
Answer: D
Warm advection forces ascent and cold advection forces descent, which is why the warm conveyor belt ahead of a surface warm front is the principal cloud and rain producing feature of a mid-latitude cyclone. The physical argument is that warm advection would otherwise destroy thermal wind balance, and the ascent is the ageostrophic response that restores it. Stratification affects the magnitude of the response but not its sign. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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