Methane emissions from western Siberian wetlands: heterogeneity and sensitivity to climate change

摘要: The prediction of methane emissions from high-latitude wetlands is important given concerns about their sensitivity to a warming climate. As basis for the wetland at regional scales, we coupled variable infiltration capacity macroscale hydrological model (VIC) with biosphere–energy-transfer–hydrology terrestrial ecosystem (BETHY) and make large-scale estimates as function soil temperature, water table depth, net primary productivity (NPP), parameterization sub-grid heterogeneity depth based on TOPMODEL. We simulated 100 km × region western Siberia surrounding Bakchar Bog, retrospective baseline period 1980–1999 have evaluated increases in temperature 0–5 °C precipitation 0–15%. interactions precipitation, through effects played an role determining these wetlands. balance between varied spatially, effect depended part topographic heterogeneity. Higher temperatures alone increased production saturated areas, but caused those areas shrink extent, resulting reduction emissions. raised tables expanded area, increase Combining 3 10% represent climate conditions that may pertain end this century resulted roughly doubling annual