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. Methane ( CH4 ) and nitrous oxide ( N2O ) compositions in ground ice may provide information on their production mechanisms inpermafrost. However, existing gas extraction methods have not been well tested. We tested conventional wet and dry gas extraction methods using icewedges from Alaska and Siberia, finding that both methods can extract gas from the easily extractable parts of the ice (e.g. gas bubbles) and yieldsimilar results for CH4 and N2O mixing ratios. We also found insignificant effects of microbial activity during wetextraction. However, both techniques were unable to fully extract gas from the ground ice, presumably because gas molecules adsorbed onto or enclosedin soil aggregates are not easily extractable. Estimation of gas production in a subfreezing environment of permafrost should consider such incompletegas extraction.

the cryosphere

Brief Communication: The reliability of gas extraction techniques for analysing CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O compositions in gas trapped in permafrost ice wedges