Discussion
Consider the following statements about QG potential vorticity.
1. It is advected by the geostrophic wind.
2. It is a linear function of the geopotential.
3. It includes a contribution from the vertical velocity.
Which of the statements given above is or are correct?
Answer: A
The first two statements are correct. The vertical velocity does not appear in the definition of quasi-geostrophic potential vorticity at all: it enters the vorticity and thermodynamic equations separately and cancels when they are combined. That cancellation is precisely what makes the potential vorticity a conserved quantity following the geostrophic flow.
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