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  Methane production as key to the greenhouse gas budget of thawing permafrost

Knoblauch, C., Beer, C., Liebner, S., Grigoriev, M., & Pfeiffer, E.-M. (2018). Methane production as key to the greenhouse gas budget of thawing permafrost. Nature Climate Change, 8(4), 309-312. doi:10.1038/s41558-018-0095-z.

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 Creators:
Knoblauch, Christian1, 2, Author           
Beer, Christian, Author
Liebner, Susanne, Author
Grigoriev, Mikhail, Author
Pfeiffer, Eva-Maria1, 2, Author           
Affiliations:
1B 1 - Arctic and Permafrost, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, ou_1863481              
2B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, ou_1863482              

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Free keywords: POLYGONAL TUNDRA; CARBON-DIOXIDE; SOIL CARBON; CLIMATE; EMISSION; SIBERIA; TEMPERATURE; VEGETATION; HYDROLOGY; OXIDATION
 Abstract: Abstract 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.

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Language(s): eng - English
 Dates: 2018-03-19
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41558-018-0095-z
 Degree: -

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Title: Nature Climate Change
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 8 (4) Sequence Number: - Start / End Page: 309 - 312 Identifier: ISSN: 1758-678x
CoNE: https://pure.mpg.de/cone/journals/resource/1758-678x