Modelling methane emissions from Arctic tundra wetlands : effects of fractional wetland maps

摘要: The Arctic tundra has been considered as one of the most sensitive areas to global climate change. One impact warming is that permafrost thawing could result in more waterlogged and anaerobic conditions, consequently an increasing release methane (CH4) atmosphere. These potential CH4 emissions can further amplify warming. Therefore, it important assess quantity from wetlands their sensitivity Process-based modelling commonly used estimate using single-source fractional wetland maps; however, not clear how difference among multisource maps affects estimations. In this study LPJ-GUESS WHyMe was applied simulate between 1961 2009 by maps, quantitative qualitative differences estimating these compared. Parameter tests a parameter optimization for model were performed before tundra. CH4/CO2 production ratio under conditions (CH4/CO2) fraction available oxygen oxidation (foxid) identified parameters total fluxes period 1961-2009. regional simulation showed uncertainties caused larger than due uncertainty. However, temporal variability significantly different when maps. For transport pathways emissions, diffusion determined dominant pathway atmosphere are soil temperature at 25 cm if water table position above surface.