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An active atmospheric methane sink in high Arctic mineral cryosols

Author(s): Lau, Maggie CY; Stackhouse, Brandon T; Layton, Alice C; Chauhan, Archana; Vishnivetskaya, Tatiana A; et al

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Abstract: Methane (CH4) emission by carbon-rich cryosols at the high latitudes in Northern Hemisphere has been studied extensively. In contrast, data on the CH4 emission potential of carbon-poor cryosols is limited, despite their spatial predominance. This work employs CH4 flux measurements in the field and under laboratory conditions to show that the mineral cryosols at Axel Heiberg Island in the Canadian high Arctic consistently consume atmospheric CH4. Omics analyses present the first molecular evidence of active atmospheric CH4-oxidizing bacteria (atmMOB) in permafrost-affected cryosols, with the prevalent atmMOB genotype in our acidic mineral cryosols being closely related to Upland Soil Cluster α. The atmospheric (atm) CH4 uptake at the study site increases with ground temperature between 0 °C and 18 °C. Consequently, the atm CH4 sink strength is predicted to increase by a factor of 5–30 as the Arctic warms by 5–15 °C over a century. We demonstrate that acidic mineral cryosols are a previously unrecognized potential of CH4 sink that requires further investigation to determine its potential impact on larger scales. This study also calls attention to the poleward distribution of atmMOB, as well as to the potential influence of microbial atm CH4 oxidation, in the context of regional CH4 flux models and global warming.
Publication Date: 14-Apr-2015
Citation: Lau, Maggie C.Y., Brandon T. Stackhouse, Alice C. Layton, Archana Chauhan, Tatiana A. Vishnivetskaya, Karuna Chourey, Jennifer Ronholm et al. "An active atmospheric methane sink in high Arctic mineral cryosols." The ISME journal 9 (2015): 1880-1891. doi:10.1038/ismej.2015.13.
DOI: doi:10.1038/ismej.2015.13
ISSN: 1751-7362
EISSN: 1751-7370
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Pages: 1880 - 1891
Language: eng
Type of Material: Journal Article
Journal/Proceeding Title: The ISME journal
Version: Author's manuscript
Notes: Related Item links to Corrigendum, published 21 July 2015.

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