Discussion
Which wave owes its existence to this restoring mechanism?
Answer: A
A parcel displaced poleward acquires anticyclonic relative vorticity and turns back, while one displaced equatorward acquires cyclonic vorticity and does the same, giving a wave whose phase propagates westward relative to the mean flow. Gravity waves are restored by buoyancy and acoustic waves by compressibility, so their mechanisms are quite different. Kelvin waves are a special class of trapped wave relying on a boundary or on the equator. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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