Discussion
Which wave drives the quasi-biennial oscillation?
Answer: A
Eastward propagating Kelvin waves and westward propagating mixed Rossby-gravity waves deposit momentum of opposite sign at different levels, producing the alternating easterly and westerly regimes that descend through the equatorial stratosphere. The period averages about 28 months. Planetary and mountain waves belong to the extratropics and cannot reach the equatorial stratosphere in the same way. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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