Full-scale evaluation of methane production under oxic conditions in a mesotrophic lake
書誌事項
- 公開日
- 2017-11-21
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1038/s41467-017-01648-4
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>Oxic lake surface waters are frequently oversaturated with methane (CH<jats:sub>4</jats:sub>). The contribution to the global CH<jats:sub>4</jats:sub> cycle is significant, thus leading to an increasing number of studies and stimulating debates. Here we show, using a mass balance, on a temperate, mesotrophic lake, that ~90% of CH<jats:sub>4</jats:sub> emissions to the atmosphere is due to CH<jats:sub>4</jats:sub> produced within the oxic surface mixed layer (SML) during the stratified period, while the often observed CH<jats:sub>4</jats:sub> maximum at the thermocline represents only a physically driven accumulation. Negligible surface CH<jats:sub>4</jats:sub> oxidation suggests that the produced 110 ± 60 nmol CH<jats:sub>4</jats:sub> L<jats:sup>−1</jats:sup> d<jats:sup>−1</jats:sup> efficiently escapes to the atmosphere. Stable carbon isotope ratios indicate that CH<jats:sub>4</jats:sub> in the SML is distinct from sedimentary CH<jats:sub>4</jats:sub> production, suggesting alternative pathways and precursors. Our approach reveals CH<jats:sub>4</jats:sub> production in the epilimnion that is currently overlooked, and that research on possible mechanisms behind the methane paradox should additionally focus on the lake surface layer.</jats:p>
収録刊行物
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- Nature Communications
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Nature Communications 8 (1), 1661-, 2017-11-21
Springer Science and Business Media LLC