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Paradox reconsidered: Methane oversaturation in well-oxygenated lake waters
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.
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2014 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 59, nr 1, s. 275-284Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The widely reported paradox of methane oversaturation in oxygenated water challenges the prevailing paradigm that microbial methanogenesis only occurs under anoxic conditions. Using a combination of field sampling, incubation experiments, and modeling, we show that the recurring mid-water methane peak in Lake Stechlin, northeast Germany, was not dependent on methane input from the littoral zone or bottom sediment or on the presence of known micro-anoxic zones. The methane peak repeatedly overlapped with oxygen oversaturation in the seasonal thermocline. Incubation experiments and isotope analysis indicated active methane production, which was likely linked to photosynthesis and/or nitrogen fixation within the oxygenated water, whereas lessening of methane oxidation by light allowed accumulation of methane in the oxygen-rich upper layer. Estimated methane efflux from the surface water was up to 5 mmol m(-2) d(-1). Mid-water methane oversaturation was also observed in nine other lakes that collectively showed a strongly negative gradient of methane concentration within 0-20% dissolved oxygen (DO) in the bottom water, and a positive gradient within >= 20% DO in the upper water column. Further investigation into the responsible organisms and biochemical pathways will help improve our understanding of the global methane cycle.

Ort, förlag, år, upplaga, sidor
2014. Vol. 59, nr 1, s. 275-284
Nationell ämneskategori
Geologi
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URN: urn:nbn:se:su:diva-107201DOI: 10.4319/lo.2014.59.1.0275ISI: 000339901800022OAI: oai:DiVA.org:su-107201DiVA, id: diva2:744238
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AuthorCount:5;

Tillgänglig från: 2014-09-08 Skapad: 2014-09-05 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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