Discussion
Assertion (A): An equatorial Kelvin wave can propagate westward.
Reason (R): The Kelvin wave has no meridional velocity component.
Select the correct answer from the options below.
Answer: B
The reason correctly states the defining property, and it is exactly that property which forces eastward propagation: only the eastward solution decays away from the equator, the westward one growing without bound. The assertion is therefore false. This is a good example of a structural constraint determining a direction of travel, which is the same argument that fixes the sense of coastal Kelvin waves.
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