Discussion
Match each equatorial wave with its propagation direction.
List I
A. Kelvin
B. Equatorial Rossby
C. Mixed Rossby-gravity
List II
P. westward phase
Q. eastward only
R. westward phase with upward energy
Select the correct match.
Answer: A
The Kelvin wave travels eastward only, the equatorial Rossby wave westward, and the mixed Rossby-gravity wave has westward phase propagation while carrying energy upward. The opposing directions of the first two produce the east-west asymmetry of the Gill response to tropical heating, and the momentum carried by the first and third drives the quasi-biennial oscillation. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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