Discussion
Which wave signature is seen in stratospheric water vapour observations?
Answer: B
The annual cycle of tropical cold point temperature imprints alternating moist and dry layers on the ascending air, and these propagate upward over several years like the signal on a tape recorder. Tracking them gives a direct measurement of the ascent rate of the Brewer-Dobson circulation. Methane oxidation does add water vapour with height, which makes that a plausible distractor, but the tape recorder signal is the striking observation.
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