Discussion
Which principle allows the flow to be recovered from potential vorticity?
Answer: C
Given a balance condition and suitable boundary values, the distribution of potential vorticity determines the wind and temperature fields throughout the domain. Conservation and invertibility together are what make the quantity so powerful, and neither alone would suffice. Geostrophic balance is one of the balance conditions that may be used in performing the inversion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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