Discussion
Which combination forces ascent in the quasi-geostrophic omega equation?
Answer: C
It is the vertical derivative of the vorticity advection that forces vertical motion, so advection increasing with height, typically because the upper trough is stronger than the surface feature, produces ascent. Uniform advection through the depth produces none. Warm advection is the second forcing term and also produces ascent, so the second option has both signs wrong.
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