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Two profiles of air samples have been collected over Southern U.S.A. (3° N latitude) between ground level and 23 km and analysed for methane. The results show, with increasing altitude, a mixing ratio nearly constant to the tropopause and decreasing rapidly in the lower stratosphere. The results suggest that the troposphere is the major region of destruction of methane. DOI: 10.1111/j.2153-3490.1966.tb00230.x
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Bainbridge et al. (1966) studied this question.
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