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- W2016331324 abstract "The photochemical behavior of methane in the early terrestrial atmosphere is investigated with a detailed model in order to determine how much CH4 might have been present and what types of higher hydroocarbons could have been formed. It is found that any primordial methane accumulated during the course of earth accretion would have been dissipated by photochemical reactions in the atmosphere in a geologically short period of time after the segregation of the core. Abiotic sources of methane are not likely to have been large enough to sustain CH4 mixing ratios as high as 10 to the -6th, the threshold for a possible methane greenhouse, with a CO-rich atmosphere being a possible exception. After the origin of life an increasing biogenic source of methane may have driven CH4 mixing ratios well above 10 to the 6th. The rise of atmospheric oxygen in the early Proterozoic may have led to a more rapid photochemical destruction of methane, lowering the mixing ratio to its present value." @default.
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- W2016331324 date "1983-06-01" @default.
- W2016331324 modified "2023-10-18" @default.
- W2016331324 title "Photochemistry of methane in the Earth's early atmosphere" @default.
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- W2016331324 doi "https://doi.org/10.1016/0301-9268(83)90069-4" @default.
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