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Biogeochemical distinction of methane emissions to the atmosphere may essentially rely on the surface area and morphometry of Amazon hydroreservoirs. Tucurui (deep) and Samuel (shallow) reservoirs released in average 13.82 +/- 22.94 and 71.19 +/- 107.4 mg CH4 m(-2) d(-1), respectively. delta(13)C-CH4 values from the sediments to the atmosphere indicate that the deep reservoir has extended methanotrophic layer, oxidizing large quantities of light isotope methane coming from the sediments, while sediment-generated methane can easily evade the shallow reservoir. (c) 2005 Elsevier Ltd. All rights reserved

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