Discussion
Which insight does Bretherton's result provide?
Answer: D
Treating a boundary temperature gradient as a delta function of potential vorticity gradient unifies boundary and interior effects into a single framework. It is what allows the Eady model, which has no interior potential vorticity gradient at all, to satisfy the Charney-Stern criterion for instability through its two boundaries. The equivalence is a formal device with real explanatory power. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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