Discussion
Which feature of the tropical tropopause controls stratospheric water vapour?
Answer: D
Air entering the stratosphere through the tropical tropopause is dehydrated to the saturation mixing ratio at the cold point, typically a few parts per million, which sets the humidity of the whole stratosphere. This is the Brewer mechanism, proposed to explain the observed dryness. Tropopause height and ozone influence the temperature but the freeze drying is the direct control. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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