Discussion
Which boundary condition does the Eady model impose?
Answer: D
Eady placed rigid horizontal boundaries at the ground and at the tropopause, which allows edge waves to exist at each and lets the pair interact to produce growth. The interaction of two counter-propagating edge waves is the cleanest available account of baroclinic instability. A free surface, periodicity or a radiation condition would each change the character of the solution, and the Charney model, which replaces the upper lid with an unbounded atmosphere on a beta plane, gives a somewhat different and more realistic answer at the cost of much greater complexity.
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