Discussion
Which quantity is the vorticity of the geostrophic wind proportional to?
Answer: D
Taking the curl of the geostrophic wind gives the relative vorticity as the Laplacian of geopotential divided by the Coriolis parameter. This is why a sharply curved trough, where the height field is strongly concave, is a vorticity maximum. The relation also underlies potential vorticity inversion, since it is the step that connects a vorticity distribution back to a height field.
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