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Title

Contribution of oxic methane production to surface methane emission in lakes and its global importance

Authors
Günthel, Marco
Kirillin, Georgiy
Ionescu, Danny
Bizic, Mina
Grossart, Hans-Peter
Tang, Kam W.
Published in Nature communications. 2019, vol. 10, no. 5497
Abstract Recent discovery of oxic methane production in sea and lake waters, as well as wetlands, demands re-thinking of the global methane cycle and re-assessment of the contribution of oxic waters to atmospheric methane emission. Here we analysed system-wide sources and sinks of surface-water methane in a temperate lake. Using a mass balance analysis, we show that internal methane production in well-oxygenated surface water is an important source for surface-water methane during the stratified period. Combining our results and literature reports, oxic methane contribution to emission follows a predictive function of littoral sediment area and surface mixed layer volume. The contribution of oxic methane source(s) is predicted to increase with lake size, accounting for the majority (>50%) of surface methane emission for lakes with surface areas >1 km2.
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Research groups Aquatic Physics
ISE Eau
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GÜNTHEL, Marco et al. Contribution of oxic methane production to surface methane emission in lakes and its global importance. In: Nature Communications, 2019, vol. 10, n° 5497. doi: 10.1038/s41467-019-13320-0 https://archive-ouverte.unige.ch/unige:143621

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Deposited on : 2020-10-28

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