Sources and emission of greenhouse gases in Danube Delta lakes |
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Authors: | Alina Pavel Edith Durisch-Kaiser Sorin Balan Silviu Radan Sebastian Sobek and Bernhard Wehrli |
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Institution: | (1) GeoEcoMar, National Institute for Marine Geology and Geoecology, 024053 Bucharest, Romania;(2) ETH, Swiss Federal Institute of Technology, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland;(3) Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland; |
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Abstract: | Production of methane and carbon dioxide as well as methane concentrations in surface waters and emissions to the atmosphere
were investigated in two flow-through lake complexes (Uzlina–Isac and Puiu–Rosu–Rosulet) in the Danube Delta during post-flood
conditions in May and low water level in September 2006. Retained nutrients fuelled primary production and remineralisation
of bioavailable organic matter. This led to an observable net release of methane, particularly in the lakes Uzlina, Puiu and
Rosu in May. Input from the Danube River, from redbuds and benthic release contributed to CH4 concentrations in surface waters. In addition to significant river input of CO2, this trace gas was released via aerobic remineralisation within the water column and in top sediments. Emission patterns
of CO2 widely overlapped with those of CH4. Generally, greenhouse gas emissions peaked in the lake complex adjacent to the Danube River in May due to strong winds and
decreased with increasing hydrological distance from the Danube River. Intense remineralisation of organic matter in the Danube
Delta lakes results in a net source of atmospheric greenhouse gases. |
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