Discussion
Which sign of vorticity advection produces height falls?
Answer: C
Advecting higher cyclonic vorticity into a region requires the geopotential to fall there, since vorticity is the Laplacian of geopotential divided by the Coriolis parameter. This is the dynamical basis of the rule that troughs deepen downstream of vorticity maxima. The relationship is the same at every level, though the magnitude of the advection varies greatly with height.
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