Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Martinez-Cruz, K.; Sepulveda-Jauregui, A.; Walter Anthony, K.; Thalasso, F.

doi:10.5194/bg-12-4595-2015

Title: Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Journal Article · Tue Aug 04 00:00:00 EDT 2015 · Biogeosciences (Online)

DOI:https://doi.org/10.5194/bg-12-4595-2015· OSTI ID:1441151

Martinez-Cruz, K. ^[1]; Sepulveda-Jauregui, A. ^[2]; Walter Anthony, K. ^[3]; Thalasso, F. ^[1]

Center for Research and Advanced Studies of the National Polytechnic Inst. (Cinvestav), Mexico City (Mexico); Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Water and Environmental Research Center
Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Water and Environmental Research Center
Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Water and Environmental Research Centerv

Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH₄) produced in lakes. Aerobic CH₄ oxidation depends mainly on lake CH₄ and oxygen (O₂) concentrations, in such a manner that higher MO rates are usually found at the oxic/anoxic interface, where both molecules are present. MO also depends on temperature, and via methanogenesis, on organic carbon input to lakes, including from thawing permafrost in thermokarst (thaw)-affected lakes. Given the large variability in these environmental factors, CH₄ oxidation is expected to be subject to large seasonal and geographic variations, which have been scarcely reported in the literature. In the present study, we measured CH₄ oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect during winter and summer with a new field laser spectroscopy method. Additionally, we measured dissolved CH₄ and O₂ concentrations. Here, we found that in the winter, aerobic CH₄ oxidation was mainly controlled by the dissolved O₂ concentration, while in the summer it was controlled primarily by the CH₄ concentration, which was scarce compared to dissolved O₂. The permafrost environment of the lakes was identified as another key factor. Thermokarst (thaw) lakes formed in yedoma-type permafrost had significantly higher CH₄ oxidation rates compared to other thermokarst and non-thermokarst lakes formed in non-yedoma permafrost environments. As thermokarst lakes formed in yedoma-type permafrost have been identified to receive large quantities of terrestrial organic carbon from thaw and subsidence of the surrounding landscape into the lake, confirming the strong coupling between terrestrial and aquatic habitats and its influence on CH₄ cycling.

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Research Organization:: Univ. of Alaska Fairbanks, Fairbanks, AK (United States). Water and Environmental Research Center

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: SC0006920; 330197/233369; 206621/203709

OSTI ID:: 1441151

Journal Information:: Biogeosciences (Online), Vol. 12, Issue 15; ISSN 1726-4189

Publisher:: European Geosciences UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 61 works

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