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Title: An active atmospheric methane sink in high Arctic mineral cryosols

The transition of Arctic carbon-rich cryosols into methane (CH₄)-emitting wetlands due to global warming is a rising concern. However, the spatially predominant mineral cryosols and their CH₄ emission potential are poorly understood. Fluxes measured in situ and estimated under laboratory conditions coupled with -omics analysis indicate (1) mineral cryosols in the Canadian high Arctic contain atmospheric CH₄-oxidizing bacteria; (2) the atmospheric CH⁺ uptake flux increases with ground temperature; and, as a result, (3) the atmospheric CH₄ sink strength will increase by a factor of 5-30 as the Arctic warms by 5-15 °C over a century. We demonstrated that acidic mineral cryosols have previously unrecognized potential of negative CH₄ feedback.
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [6] ;  [3] ;  [6] ;  [5] ;  [1] ;  [2] ;  [6] ;  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. McGill Univ., Montreal, QC (Canada); Laurentian Univ., Ontario (Canada)
  5. Univ. of Texas at Austin, Austin, TX (United States)
  6. McGill Univ., Montreal, QC (Canada)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The ISME Journal
Additional Journal Information:
Journal Volume: 9; Journal Issue: 8; Journal ID: ISSN 1751-7362
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States