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Greenhouse Gases in Non-Oxygenated and Artificially Oxygenated Eutrophied Lakes during Winter Stratification

^a Research and Development Unit of Environmental Health, Department of Environmental Sciences, Bioteknia 2, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland
^b North Savo Regional Environment Centre, P.O. Box 1049, FIN-70701 Kuopio, Finland
^c Department of Biology, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland

View larger version (17K): [in a new window]   Fig. 1. Study sites on the non-oxygenated basin of Lake Kevätön (A1), and on the non-oxygenated (A2) and oxygenated (B1 and B2) basins of Lake Pöljänjärvi in the mid-boreal zone of Finland. Streams are indicated by arrows, and the location of the Mixox oxygenator by X. The earlier hospital sewage outlet is indicated by L

View larger version (35K): [in a new window]   Fig. 2. The measured in situ concentrations of dissolved CH4, CO2, N2O, and O2, and temperature in the water columns of non-oxygenated sites (a) A1 and (b) A2 and oxygenated sites (c) B1 and (d) B2 during winter stratification on 13 Mar. 1997. The concentrations in equilibrium with the atmosphere were 3.6 to 4.0 nM for CH4, 22 to 26 µM for CO2, and 14 to 17 nM for N2O at the measured water temperatures

View larger version (33K): [in a new window]   Fig. 3. The measured in situ concentrations of dissolved CH4, CO2, N2O, and O2, and temperature in the water columns of non-oxygenated sites (a) A1 and (b) A2 and oxygenated sites (c) B1 and (d) B2 during winter stratification on 10 Mar. 1999. The concentrations in equilibrium with the atmosphere were 3.6 to 4.0 nM for CH4, 22 to 26 µM for CO2, and 14 to 17 nM for N2O at the measured water temperatures. Those CH4 concentrations below the detection limit are indicated with an asterisk