title: Biogeochemical distinction of methane releases from two Amazon hydroreservoirs.
abstract: 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. delta13C-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.
authors.affiliation: National Institute for Space Research, Remote Sensing Division, Processes of the Hydrosphere, Astronautas Av. 1758, Sao Jose dos Campos, SP, 12227-010, Brazil.ivan@ltid.inpe.br
authors.forename: Ivan Bergier Tavares
authors.initials: IB
authors.lastname: Lima
mesh_terms: D001272:Atmosphere; D044822:Biodiversity; D001938:Brazil; D002247:Carbon Isotopes / Q000737:chemistry; D005618:Fresh Water; D019015:Geologic Sediments / Q000032:analysis*; D055593:Geological Phenomena; D005844:Geology; D008697:Methane / Q000032:analysis*; D010084:Oxidation-Reduction; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D014874:Water Pollutants, Chemical; D008697:Methane