Discussion
Consider the following statements about equatorial waves.
1. Kelvin waves propagate eastward only.
2. Mixed Rossby-gravity waves drive part of the quasi-biennial oscillation.
3. Equatorial Rossby waves propagate eastward.
Which of the statements given above is or are correct?
Answer: B
The first two statements are correct. Equatorial Rossby waves, like their mid-latitude counterparts, propagate westward relative to the mean flow. The opposing directions of the Kelvin and Rossby responses are precisely what produces the east-west asymmetry of the Gill pattern around a region of tropical heating, so the point is worth fixing firmly.
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