Discussion
Which energy conversion drives baroclinic growth?
Answer: B
Growing baroclinic waves convert the available potential energy of the meridional temperature gradient into eddy kinetic energy by lifting warm air and lowering cold air. Barotropic instability draws on the horizontal shear of the mean flow instead. Latent heat release amplifies the process but is not the primary conversion in the dry theory, and the final option describes the decay phase of the eddy life cycle. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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