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

Marco Günthel (), Daphne Donis, Georgiy Kirillin, Danny Ionescu, Mina Bizic, Daniel F. McGinnis (), Hans-Peter Grossart () and Kam W. Tang ()
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Marco Günthel: Swansea University
Daphne Donis: University of Geneva
Georgiy Kirillin: Leibniz Institute of Freshwater Ecology and Inland Fisheries
Danny Ionescu: Leibniz Institute of Freshwater Ecology and Inland Fisheries
Mina Bizic: Leibniz Institute of Freshwater Ecology and Inland Fisheries
Daniel F. McGinnis: University of Geneva
Hans-Peter Grossart: Leibniz Institute of Freshwater Ecology and Inland Fisheries
Kam W. Tang: Swansea University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13320-0

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