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. The response of CH4 emission from natural wetlands due tometeorological conditions is important because of its strong greenhouseeffect. To understand the relationship between CH4 flux andwetting, we observed interannual variations in chamber CH4 flux, aswell as the concentration, δ13C , and δD ofdissolved CH4 during the summer from 2009 to 2013 at thetaiga–tundra boundary in the vicinity of Chokurdakh (70 ∘ 37 ′  N,147 ∘ 55 ′  E), located on the lowlands of the Indigirka River innortheastern Siberia. We also conducted soil incubation experiments tointerpret δ13C and δD of dissolved CH4 and to investigate variations in CH4 production and oxidationprocesses. Methane flux showed large interannual variations in wet areas ofsphagnum mosses and sedges(36–140 mg  CH4  m −2  day −1 emitted). Increased CH4 emission was recorded in the summer of 2011 when a wettingevent with extreme precipitation occurred. Although water level decreasedfrom 2011 to 2013, CH4 emission remained relatively high in 2012,and increased further in 2013. Thaw depth became deeper from 2011 to 2013,which may partly explain the increase in CH4 emission. Moreover,dissolved CH4 concentration rose sharply by 1 order of magnitudefrom 2011 to 2012, and increased further from 2012 to 2013. Large variationsin δ13C and δD of dissolved CH4 wereobserved in 2011, and smaller variations were seen in 2012 and 2013,suggesting both enhancement of CH4 production and less significanceof CH4 oxidation relative to the larger pool of dissolved CH4 . These multi-year effects of wetting on CH4 dynamicsmay have been caused by continued soil reduction across multiple yearsfollowing the wetting. Delayed activation of acetoclastic methanogenesisfollowing soil reduction could also have contributed to the enhancement of CH4 production. These processes suggest that duration of watersaturation in the active layer can be important for predicting CH4 emission following a wetting event in the permafrost ecosystem.

biogeosciences

Multi-year effect of wetting on CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; flux at taiga–tundra boundary in northeastern Siberia deduced from stable isotope ratios of CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;