Methane budget of East Asia, 1990-2015: A bottom-up evaluation

摘要: Abstract The regional budget of methane (CH4) emissions for East Asia, a crucial region in the global greenhouse gas budget, was quantified 1990–2015 with bottom-up method based on inventories and emission model simulations. Anthropogenic associated fossil fuel extraction, industrial activities, waste management, agricultural activities were derived from Emission Database Global Atmospheric Research version 4.3.2 compared other inventories. Emissions natural wetlands CH4 uptake by upland soil oxidation estimated using Vegetation Integrative SImulator Trace gases (VISIT), biogeochemical that considers historical land use climatic conditions. biomass burning termites calculated satellite land-use data combined empirical factors. resulting average annual 2000–2012 indicated Asia net source 67.3 Tg yr−1, which 88.8% anthropogenic emissions. uncertainty (±standard deviation) this estimate, ±14 stemmed inconsistencies. increase flux 60.2 yr−1 1990 to 78.0 2012 due mainly increased extraction livestock sectors. Our results showed component budget. A spatial analysis 0.25° × 0.25° grid cells revealed hotspots urban areas, wetlands. These surrounded weak sinks areas. fell within range independent estimates, including top-down estimates atmospheric inversion models. Such accounting is an effective way elucidate forcings develop mitigation policies. Further studies, however, are required reduce uncertainties