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

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.

SUBMITTER: Gunthel M

PROVIDER: S-EPMC6888895 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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

Günthel Marco M Donis Daphne D Kirillin Georgiy G Ionescu Danny D Bizic Mina M McGinnis Daniel F DF Grossart Hans-Peter HP Tang Kam W KW

Nature communications 20191202 1

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. ...[more]

PMID: 31792203

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