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- W4220996034 abstract "<p>Lakes are major global sources of atmospheric methane (CH<sub>4</sub>), representing an important greenhouse gas. Dissolved molecular Oxygen (DO) in lakes hinders production of CH<sub>4</sub> while promoting CH<sub>4</sub> oxidation. Consequently, it has been suggested as an important regulator of CH<sub>4</sub> emissions from lakes. Presence or absence of DO at the sediment-water interface could therefore influence the extent of CH<sub>4</sub> production in top sediment layers, and the amount of CH<sub>4</sub> that is stored in the anoxic layer of the water column and potentially emitted during water column mixing events. However, the quantitative importance of DO on CH<sub>4</sub> fluxes remains unknown. We studied CH<sub>4</sub> fluxes from two lake basins in northern boreal Sweden of which DO was experimentally added to the deep waters in one of the basins (experimental basin) while the other basin was left in a natural state (reference basin). We used spatial and temporally distributed flux chambers to measure CH<sub>4</sub> fluxes while the lake basins were stratified (from June to October) and found that there was no significant difference in CH<sub>4</sub> fluxes between the two lake basins attributable to the water column experiment. Moreover, we found that the oxygenation of the hypolimnion resulted in a large decrease in CH<sub>4</sub> concentration in the experimental basin, in contrast to the reference basin. However, our monthly lake profile measurements indicated that only a small amount of this CH<sub>4</sub> may have been emitted during the open-water season. First, the two lake basins were subject to incomplete spring and fall mixing events. Second, our CH<sub>4</sub> emission and oxidation model, based on bathymetry, CH<sub>4</sub> concentrations, depth distributed <sup>13</sup>C/<sup>12</sup>C measurements, and gas transfer velocities, indicated that 0 &#8211; 24 % of the stored CH<sub>4</sub> may be emitted on a yearly basis. This shows that the overall impact on CH<sub>4</sub> emissions from boreal forest lakes, due to CH<sub>4</sub> storage and DO, may be smaller than previously believed. However, Fluxes during the mixing events still represent a large uncertainty for the total yearly lake CH<sub>4</sub> emissions.</p>" @default.
- W4220996034 created "2022-04-03" @default.
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- W4220996034 date "2022-03-28" @default.
- W4220996034 modified "2023-10-14" @default.
- W4220996034 title "How important is water column dissolved oxygen (O2) for lake methane emissions?" @default.
- W4220996034 doi "https://doi.org/10.5194/egusphere-egu22-8863" @default.
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