Discussion
Which property makes quasi-geostrophic potential vorticity so useful?
Answer: A
Because the QG potential vorticity is a linear elliptic operator applied to the geopotential, inverting it to recover the height, wind and temperature fields is a straightforward Poisson-type problem. Ertel's exact potential vorticity is nonlinear and its inversion requires an iterative solution. Diabatic heating destroys conservation in both cases, and the field varies with height like any other. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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