Discussion
Which effect does adding the beta effect introduce?
Answer: B
The beta effect opposes the interior potential vorticity gradient created by the shear, and below a critical shear it cancels it so the Charney-Stern criterion is not satisfied. It also stabilises the longest waves, producing a bounded unstable band. Comparing the Eady and two-level models is the clearest way to see exactly what beta contributes to the problem. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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