Brief Communication: The reliability of gas extraction techniques for analysing CH<sub>4</sub> and N<sub>2</sub>O compositions in gas trapped in permafrost ice wedges
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Published:2020-04-23
Issue:4
Volume:14
Page:1311-1324
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Yang Ji-Woong,Ahn Jinho,Iwahana Go,Han Sangyoung,Kim Kyungmin,Fedorov Alexander
Abstract
Abstract. Methane (CH4) and nitrous oxide (N2O) compositions in ground ice may provide information on their production mechanisms in
permafrost. However, existing gas extraction methods have not been well tested. We tested conventional wet and dry gas extraction methods using ice
wedges from Alaska and Siberia, finding that both methods can extract gas from the easily extractable parts of the ice (e.g. gas bubbles) and yield
similar results for CH4 and N2O mixing ratios. We also found insignificant effects of microbial activity during wet
extraction. However, both techniques were unable to fully extract gas from the ground ice, presumably because gas molecules adsorbed onto or enclosed
in soil aggregates are not easily extractable. Estimation of gas production in a subfreezing environment of permafrost should consider such incomplete
gas extraction.
Funder
National Research Foundation of Korea National Aeronautics and Space Administration
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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