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- W2103294761 abstract "Methane (CH4) is the most abundant organic species in the Earth's atmo sphere. It is a greenhouse gas, as are water vapor (H20), carbon dioxide (C02), nitrous oxide (NzO), ozone (03), and the chlorofluorocarbon com pounds. It absorbs long wave radiation emitted from the Earth's surface in the 4 100 /lm atmospheric window and therefore affects atmospheric temperature directly (Lacis et al 1981, Ramanathan 1 988, Hansen et a1 1988). It is chemically reactive, and influences the abundance of ozone in the troposphere and in the stratosphere (Johnston 1984), and it is a major source of stratospheric water (Ehhalt 1979, Pollock et al 1980). Methane thus affects temperature indirectly through its chemical interactions. Systematic measurements of the global tropospheric CH4 mixing ratios since 1978 reveal a steady increase with time by about I % per year, due to anthropogenic activities (Blake & Rowland 1988, Steele et al 1987). The history of CH4 atmospheric mixing ratios has been reconstructed from measurements of air occluded in ice cores for glacial and interglacial times, as well as during the more recent 200 years through the industrial era (Chappellaz et a1 1990; Pearman et al 1986; Etheridge et al 1988; Stauffer et a1 1985; Craig & Chou 1982; Rasmussen & Khalil 1 98 1a, 1981c; Robbins et al 1973). Large natural and anthropogenically influenced variations are observed over different time scales. In the troposphere CH4 is oxidized to CO and ultimately to CO2 and H20. This oxidation reaction sequence is initiated by the hyroxyl (OH) radical. This constitutes the major sink for CH4• The atmospheric lifetime for methane is 8-12 yr. Methane emitted from inundated anoxic environ-" @default.
- W2103294761 created "2016-06-24" @default.
- W2103294761 creator A5019076605 @default.
- W2103294761 date "1993-05-01" @default.
- W2103294761 modified "2023-10-12" @default.
- W2103294761 title "The Global Methane Cycle" @default.
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- W2103294761 doi "https://doi.org/10.1146/annurev.ea.21.050193.002203" @default.
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