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The 6 16 −5 23 rotational transition at 22.2 GHz has been used to measure the H 2 O vertical profile in the upper stratosphere and mesosphere. Observations were made during January, April, July, and September 1980 and, except in April, the average profile was characterized by a 10 ppmv layer between 60 and 70 km and a decrease in concentration to less than 1 ppmv above 80 km.
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Thacker et al. (1981) studied this question.
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