Spatial distributions of aerosol concentrations and depositions in Asia during the year 2010

摘要

Aerosol Modeling System (AMS) that is consisted of the Asian Dust Aerosol Model2 (ADAM2) and the Community Multi-scale Air Quality (CMAQ) modeling system has been employed to document the spatial distributions of the annual averaged both the Asian dust (AD) aerosol and the anthropogenic aerosol (AA) concentrations and their total depositions in several chosen regions and the Asian region for the year 2010. It is found that the annual mean surface aerosol (PM_(10)) concentrations in the Asian region affect in a wide region as a complex mixture of AA and AD aerosols; they are predominated by the AD aerosol in the AD source region of northern China and Mongolia with a maximum annual mean concentration exceeding 300 μg m~(-3); AAs are predominated in the high pollutant emission regions of southern and eastern China and northern India with a maximum concentration exceeding 110 μg m~(-3); while the mixture of AA and AD aerosols is dominated in the downwind regions extending from the Yellow Sea to the Northwest Pacific Ocean. It is also found that the annual total deposition of aerosols in the model domain is found to be 485.2 Tg (371. 8 Tg by AD aerosol and 113.4 Tg by AA), of which 66% (318.6 Tg) is contributed by the dry deposition (305.3 Tg by AD aerosol and 13.3 Tg by AA) and 34% (166.6 Tg) by the wet deposition (66.3 Tg by AD aerosol and 100.1 Tg by AA), suggesting about 77% of the annual total deposition being contributed by the AD aerosol mainly through the dry deposition process and 23% of it by AA through the wet deposition process.