Impact assessment of biomass burning on air quality in Southeast and East Asia during BASE-ASIA

摘要: A synergy of numerical simulation, ground-based measurement and satellite observation was applied to evaluate the impact biomass burning originating from Southeast Asia (SE Asia) within framework NASA's 2006 Biomass Aerosols in Asia: Smoke Impact Assessment (BASE-ASIA). emissions spring peaked March–April when most intense occurred Myanmar, northern Thailand, Laos, parts Vietnam Cambodia. Model performances were reasonably validated by comparing both observations despite overestimation or underestimation occurring specific regions due high uncertainties emission. Chemical tracers particulate K+, OC concentrations, OC/EC ratios showed distinct regional characteristics, suggesting local emission dominated aerosol chemistry. CMAQ modeled chemical components underestimated at circumstances converted AOD values biased low about a factor 2, probably emissions. Scenario simulation indicated that downwind spread over large area via Asian monsoon, which included Southern China, South China Sea, Taiwan Strait. Comparison AERONET optical properties with multi-sites clearly demonstrated long-range transport. In source region, contribution estimated be 56%. While regions, still significant range 26%–62%.