Discussion
Assertion (A): The Eady model requires both of its boundaries for instability.
Reason (R): Its interior potential vorticity gradient is zero.
Select the correct answer from the options below.
Answer: B
With no interior gradient, the sign change demanded by the Charney-Stern criterion can only be supplied by the two boundary temperature gradients, and removing either one removes the instability. The reason therefore explains the assertion exactly. This makes the Eady model the cleanest illustration of Bretherton's equivalence between boundary temperature and interior potential vorticity.
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