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Methane production ...
Methane production as key to the greenhouse gas budget of thawing permafrost
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Knoblauch, Christian (author)
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- Beer, Christian (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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Liebner, Susanne (author)
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Grigoriev, Mikhail N. (author)
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Pfeiffer, Eva-Maria (author)
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(creator_code:org_t)
- 2018-03-19
- 2018
- English.
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In: Nature Climate Change. - : Springer Science and Business Media LLC. - 1758-678X .- 1758-6798. ; 8:4, s. 309-312
- Related links:
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https://gfzpublic.gf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Permafrost thaw liberates frozen organic carbon, which is decomposed into carbon dioxide (CO2) and methane (CH4). The release of these greenhouse gases (GHGs) forms a positive feedback to atmospheric CO2 and CH4 concentrations and accelerates climate change(1,2). Current studies report a minor importance of CH4 production in water-saturated (anoxic) permafrost soils(3-6) and a stronger permafrost carbon-climate feedback from drained (oxic) soils(1,7). Here we show through seven-year laboratory incubations that equal amounts of CO2 and CH4 are formed in thawing permafrost under anoxic conditions after stable CH4-producing microbial communities have established. Less permafrost carbon was mineralized under anoxic conditions but more CO2-carbon equivalents (CO2Ce) were formed than under oxic conditions when the higher global warming potential (GWP) of CH4 is taken into account(8). A model of organic carbon decomposition, calibrated with the observed decomposition data, predicts a higher loss of permafrost carbon under oxic conditions (113 +/- 58 g CO2-C kgC(-1) (kgC, kilograms of carbon)) by 2100, but a twice as high production of CO2-Ce (241 +/- 138 g CO2-Ce kgC(-1)) under anoxic conditions. These findings challenge the view of a stronger permafrost carbon-climate feedback from drained soils1,7 and emphasize the importance of CH4 production in thawing permafrost on climate-relevant timescales.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- SAMHÄLLSVETENSKAP -- Social och ekonomisk geografi (hsv//swe)
- SOCIAL SCIENCES -- Social and Economic Geography (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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