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The Effects of Water Column Dissolved Oxygen Concentrations on Lake Methane Emissions-Results From a Whole-Lake Oxygenation Experiment
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0001-7960-0129
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0002-6815-7261
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0003-0934-2077
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
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2023 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 128, no 11, article id e2022JG007185Article in journal (Refereed) Published
Abstract [en]

Lakes contribute 9%-19% of global methane (CH4) emissions to the atmosphere. Dissolved molecular oxygen (DO) in lakes can inhibit the production of CH4 and promote CH4 oxidation. DO is therefore often considered an important regulator of CH4 emissions from lakes. Presence or absence of DO in the water above the sediments can affect CH4 production and emissions by (a) influencing if methane production can be fueled by the most reactive organic matter in the top sediment layer or rely on deeper and less degradable organic matter, and (b) enabling CH4 accumulation in deep waters and potentially large emissions upon water column turnover. However, the relative importance of these two DO effects on CH4 fluxes is still unclear. We assessed CH4 fluxes from two connected lake basins in northern boreal Sweden where one was experimentally oxygenated. Results showed no clear difference in summer CH4 emissions attributable to water column DO concentrations. Large amounts of CH4 accumulated in the anoxic hypolimnion of the reference basin but little of this may have been emitted because of incomplete mixing, and effective methane oxidation of stored CH4 reaching oxic water layers. Accordingly, <= 24% of the stored CH4 was likely emitted in the experimental lake. Overall, our results suggest that hypolimnetic DO and water column CH4 storage might have a smaller impact on CH4 emissions in boreal forest lakes than previous estimates, yet potential fluxes associated with water column turnover events remain a significant uncertainty in lake CH4 emission estimates.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2023. Vol. 128, no 11, article id e2022JG007185
Keywords [en]
methane; dissolved oxygen; storage; emissions; methane oxidation
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:liu:diva-199325DOI: 10.1029/2022JG007185ISI: 001096659600001OAI: oai:DiVA.org:liu-199325DiVA, id: diva2:1815099
Note

Funding Agencies|European Research Council under the European Union [725546]; Knut and Alice Wallenberg Foundation [2016.0083]; Knut and Alice Wallenberg Foundation (Wallenberg Academy Fellowship); Swedish Research Council [2018-01794]

Available from: 2023-11-28 Created: 2023-11-28 Last updated: 2023-11-28

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Pajala, GustavSawakuchi, HenriqueRudberg, DavidSchenk, JonathanSieczko, AnnaGålfalk, MagnusSundgren, IngridNguyen, Thanh DucBastviken, David
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Tema Environmental ChangeFaculty of Arts and Sciences
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Journal of Geophysical Research - Biogeosciences
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