Methane and Carbon Dioxide Fluxes at the Sediment-Water Interface in Reservoirs
Renata Gruca-Rokosz, Janusz Andrzej Tomaszek, Piotr Koszelnik, Ewa Czerwieniec
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Department of Environmental and Chemistry Engineering, Faculty of Civil and Environmental Engineering,
Rzeszów University of Technology, Powstańców Warszawy 6, 35-959 Rzeszów, Poland
Pol. J. Environ. Stud. 2011;20(1):81-86
Methane (CH4) and carbon dioxide (CO2) fluxes at the sediment-water interface were studied during autumn in three reservoirs in Poland. The theoretical diffusive fluxes of dissolved pore-water carbon gases to the overlying water ranged from 0.16 mg·m-2d-1 to 3.84 mg·m-2d-1 and from 20.68 mg·m-2d-1 to 99.88 mg·m-2d-1 for methane and carbon dioxide, respectively. The comparison between the diffusive fluxes of methane at the sediment-water interface and its fluxes at the water-atmosphere interface showed that an ebullition is probably the major pathway for CH4 transport from the sediment to the atmosphere. The fluxes of CO2 at the sediment- water interface were considerably lower than its fluxes at the water-atmosphere interface. This indicates that most CO2 is generated in the water column, whereas only a small portion originates from sediments.
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