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Diffusive methane fluxes from Negro, Solimões and Madeira rivers and fringing l...
Barbosa, Pedro Maia; Melack, John M.; Farjalla, Vinícius Fortes; Amaral, João Henrique Fernandes; Scofield, Vinicius; Forsberg, Bruce RiderThe first extensive set of measurements of methane concentrations and fluxes for the Negro River and its major tributaries combined with complementary data for the Solimões and Madeira rivers and several tributaries are presented and their temporal and spatial variations examined. Fluxes were measured using floating chambers, and dissolved CH4 concentrations were measured by the headspace technique. In the Soli...
Seasonal variation and interaction of photodegradation and microbial metabolism...
Amaral, João Henrique Fernandes; Suhett, Albert Luiz; Melo, Sérgio; Farjalla, Vinícius FortesPhotodegradation of dissolved organic carbon (DOC) can generate labile substrates readily available for microbial consumption, thus increasing DOC removal, especially in fresh - water humic ecosystems. While a few studies have evaluated the effects of sunlight on DOC removal and CO2 production in aquatic environments, none have investigated the seasonal variation and interaction of photodegradation and microbia...