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The effects of water column dissolved oxygen concentrations on lake methane emissions : results from a whole-lake oxygenation experiment

Pajala, Gustav (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Sawakuchi, Henrique (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Rudberg, David (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
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Schenk, Jonathan (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Sieczko, Anna (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Gålfalk, Magnus (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Seekell, David A. (author)
Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Umea Univ, Sweden
Sundgren, Ingrid (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Nguyen, Thanh Duc (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Karlsson, Jan, 1974- (author)
Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Umea Univ, Sweden
Bastviken, David (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
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 (creator_code:org_t)
American Geophysical Union (AGU), 2023
2023
English.
In: Journal of Geophysical Research - Biogeosciences. - : American Geophysical Union (AGU). - 2169-8953 .- 2169-8961. ; 128:11
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

Keyword

dissolved oxygen
emissions
methane
methane oxidation
storage

Publication and Content Type

ref (subject category)
art (subject category)

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