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Causes of increasing atmospheric methane - Depletion of hydroxyl radicals and the rise of emissions (1985)

Khalil, M. A. K. ; Rasmussen, R. A.

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Publication Date: 2011-08-19

Description: A combination of anthropogenic activities and a possible decline of global concentrations for the hydroxyl radicals that formerly removed methane from the atmosphere are cited as potential causes for the 1.3 percent/year rise of atmospheric methane levels. Calculations are presented which show that much of the methane increase over the last 200 years is probably to be divided among the two main sources in the proportions of 70 percent for anthropogenic generation and 30 percent for hydroxyl radical depletion. It is projected that in 20 years, average tropospheric concentrations of methane may be about 20 percent greater than 1980 levels. The current abundance of hydroxyl radicals may be 20 percent less than two centuries ago.

Keywords: GEOPHYSICS

Type: Atmospheric Environment (ISSN 0004-6981); 19; 397-407

Format: text

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