Discussion
Which mechanism does the Eady solution describe as producing growth?
Answer: A
Each boundary supports a wave that propagates against the local flow, and at the most unstable wavelength the two lock into a fixed phase relationship with a westward tilt and amplify each other. Growth therefore requires both boundaries. Latent heat is absent from the dry model although it matters greatly in reality, friction is neglected entirely, and gravity wave reflection describes a quite different class of solution that carries no available potential energy.
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