Methane Concentration and Emission in Dominant Landscapes of Typical Tundra of Western YamalстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
Аннотация:We present the results of studies of the methane content in soils of the active layer andunderlying permafrost, as well as data on the emission of methane into the atmosphere in thedominant landscapes of typical tundra of the western coast of the Yamal Peninsula. A detailedlandscape map of the study area was compiled, the dominant types of landscapes were determined,and vegetation cover was described. We determined that a high methane content is characteristic ofthe wet landscapes: peat bogs within the floodplains, water tracks, and lake basins. Average valuesof the methane content in the active layer for such landscapes varied from 2.4 to 3.5 mL (CH4)/kg,with a maximum of 9.0 mL (CH4)/kg. The distribution of methane in studied sections ischaracterized by an increase in its concentration with depth. This confirms the diffuse mechanismof methane transport in the active layer and emission of methane into the atmosphere. The transitionzone of the upper permafrost contains 2.5–5-times more methane than the active layer and maybecome a significant source of methane during the anticipated permafrost degradation. Significantfluxes of methane into the atmosphere of 2.6 mg (CH4) * m–2 * h–1 are characteristic of the floodedlandscapes of peat bogs, water tracks, and lake basins, which occupy approximately 45% of thetypical tundra area.