Discussion
Consider the following statements about potential vorticity.
1. It is conserved for adiabatic frictionless motion.
2. It can be inverted to recover the wind and mass fields.
3. It is unaffected by latent heat release.
Which of the statements given above is or are correct?
Answer: C
Conservation and invertibility are the two properties that make potential vorticity so powerful, but latent heat release is a diabatic process and therefore destroys the conservation. Indeed the low level potential vorticity anomaly generated by condensational heating is an important contributor to rapid cyclogenesis, so the third statement is not merely wrong but wrong in an interesting and useful way.
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