Discussion
Which quantity must change sign somewhere for baroclinic instability to be possible?
Answer: B
The Charney Stern criterion requires the meridional potential vorticity gradient to change sign somewhere in the domain, with boundary temperature gradients counting as delta functions in that gradient. In the Eady model the interior gradient is zero and the two boundaries supply the required change of sign. Constant shear, a fixed Coriolis parameter and positive static stability are all perfectly compatible with instability, so none of the other conditions is necessary.
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