CH4 oxidation in a boreal lake during the development of hypolimnetic hypoxia
Saarela, T., Rissanen, A. J., Ojala, A., Pumpanen, J., Aalto, S. L., Tiirola, M., Vesala, T., & Jäntti, H. (2020). CH4 oxidation in a boreal lake during the development of hypolimnetic hypoxia. Aquatic Sciences, 82, Article 19. https://doi.org/10.1007/s00027-019-0690-8
Published inAquatic Sciences
© The Author(s) 2019
Freshwater ecosystems represent a significant natural source of methane (CH4). CH4 produced through anaerobic decomposition of organic matter (OM) in lake sediment and water column can be either oxidized to carbon dioxide (CO2) by methanotrophic microbes or emitted to the atmosphere. While the role of CH4 oxidation as a CH4 sink is widely accepted, neither the magnitude nor the drivers behind CH4 oxidation are well constrained. In this study, we aimed to gain more specific insight into CH4 oxidation in the water column of a seasonally stratified, typical boreal lake, particularly under hypoxic conditions. We used 13CH4 incubations to determine the active CH4 oxidation sites and the potential CH4 oxidation rates in the water column, and we measured environmental variables that could explain CH4 oxidation in the water column. During hypolimnetic hypoxia, 91% of available CH4 was oxidized in the active CH4 oxidation zone, where the potential CH4 oxidation rates gradually increased from the oxycline to the hypolimnion. Our results showed that in warm springs, which become more frequent, early thermal stratification with cold well-oxygenated hypolimnion delays the period of hypolimnetic hypoxia and limits CH4 production. Thus, the delayed development of hypolimnetic hypoxia may partially counteract the expected increase in the lacustrine CH4 emissions caused by the increasing organic carbon load from forested catchments. ...
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Related funder(s)European Commission
Funding program(s)FP7 (EU's 7th Framework Programme)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingOpen access funding provided by University of Eastern Finland (UEF) including Kuopio University Hospital. This study was supported by Olvi-säätiö (Grant No. 201720037) and Maa-ja Vesitekniikan tuki ry (Grant No. 34348) for TS, Academy of Finland (project No. 286642 for AJR, project No. 275127 for HJ, and project No. 310302 for SLA), and European Research Council (ERC) CoG project No. 615146 for MT. The authors acknowledge the Academy of Finland Centre of Excellence (project No. 272041, 118780 and 307331) and ARCTICFIRE-project (project No. 286685) funded by Academy of Finland for JP, Academy Professor projects (No. 1284701 and 1282842), ICOS-Finland (project No. 281255) and CarLAC-project (project No. 281196) funded by Academy of Finland for TV. In addition, the authors acknowledge University of Eastern Finland Water Research Programme funded by Olvi-säätiö, Jenny and Antti Wihuri Foundation and Saastamoinen Foundation for HJ. ...
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