Discussion
Which model deficiency does this identify as important?
Answer: C
Because diabatic potential vorticity generation feeds back onto the large scale flow, errors in convection and cloud schemes limit medium range predictability even for the largest scales. This has motivated substantial effort on moist physics in global models. Resolution, coordinates and time stepping all matter but none has the same direct route into large scale forecast error. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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