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• W2032177145 abstract "Sources and sinks of atmospheric methane are studied in savanna regions of west and central Africa. Flux measured over dry savanna soils, using static chambers, is always negative the average uptake rate being 2×10 10 molecules/cm 2 /s. In these regions, sources are linked to biomass burning. Methane and CO 2 emission from combustion of savanna plants and wood is studied by both field experiments and laboratory experiments using a combustion chamber. For savanna plants most of the carbon (85%) contained in the biomaterial is volatilized as CO 2 and 0.1 to 0.25% as methane. For graminaceous plants like loudetia simplex the ratio C‐CH 4 /C‐CO 2 is 0.11%; it is 0.28% for hyparrhenia the other main type of savanna plants and it attains 1.4% for the combustion of wood. In natural fire plumes this ratio is around 0.26% for savanna fires and 0.56 to 2.22% for forest fires. These results show that methane release is highly dependent on the type of combustion. Methane to CO 2 ratios are also studied in vertical profiles in the troposphere taken during the TROPOZ I campaign, an aerial research expedition carried out over west Africa during the bushfire period. Within polluted layers, the average ratio of CH 4 to CO 2 excess over ambient air concentration is 0.34%. These results show that biomass burning in tropical Africa constitutes an important source of atmospheric methane estimated to about 9.2×10 6 T(CH 4 )/yr." @default.
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• W2032177145 date "1991-04-20" @default.
• W2032177145 modified "2023-09-26" @default.
• W2032177145 title "Sources and sinks of methane in the African savanna. CH₄emissions from biomass burning" @default.
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• W2032177145 doi "https://doi.org/10.1029/90jd02496" @default.
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