Discussion
Which cut-off does the Eady model produce at short wavelengths?
Answer: A
Below a critical wavelength the two edge waves cannot influence one another across the depth of the layer, so phase locking is impossible and the disturbance merely propagates. This short wave cut-off is a robust feature appearing in every baroclinic instability model. The Eady model has no long wave cut-off, which is a consequence of omitting the beta effect. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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