Discussion
Which wavenumbers dominate the stationary wave pattern of the northern winter?
Answer: C
The stationary pattern forced by the Rockies, the Tibetan Plateau and the land-sea contrasts is dominated by the longest waves, principally wavenumbers one to three. Only these are long enough to satisfy the Charney-Drazin criterion and propagate into the stratosphere. Wavenumbers five to seven describe the travelling synoptic waves, and wavenumber zero is the zonal mean rather than a wave at all. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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