A Eulerian sulfur deposition model is used to study the distributions of sulfur pollutants in East Asia, in which important physical and chemical processes such as transport, diffusion, dry and wet deposition, vertica...A Eulerian sulfur deposition model is used to study the distributions of sulfur pollutants in East Asia, in which important physical and chemical processes such as transport, diffusion, dry and wet deposition, vertical transportation in cumulus cloud, gas phase chemistry, aqueous phase chemistry and heterogeneous aerosol chemistry are included. Two cases, the periods of 1987.07.02 GMT00-1987 07 03 GMT00(case 1) and 1989 04 20 GMT00-1989 04 21 GMT00(case 2), are studied and the distributions of SO 2 and SO 2- 4 in East Asia are shown. It is revealed that the patterns of distributions of SO 2 and SO 2- 4 are different under different meteorological conditions. In the upper layer, the concentrations of SO 2 and SO 2- 4 are 0.4-1.0?μg/m 3 and 0.2-0.5?μg/m 3, 4.0-10.0?μg/m 3 and 2.0-6.0?μg/m 3 in the middle layer. In the surface layer, the levels of SO 2 range from 4.0 to 30.0?μg/m 3 and from 2.0 to 8.0?μg/m 3 for SO 2- 4. Distributions of SO x are controlled by emissions in the surface layer, while in the upper layer it is mainly affected by precipitation. The distributions of SO x show the interaction of emissions, winds and precipitation in the middle layer.展开更多
文摘A Eulerian sulfur deposition model is used to study the distributions of sulfur pollutants in East Asia, in which important physical and chemical processes such as transport, diffusion, dry and wet deposition, vertical transportation in cumulus cloud, gas phase chemistry, aqueous phase chemistry and heterogeneous aerosol chemistry are included. Two cases, the periods of 1987.07.02 GMT00-1987 07 03 GMT00(case 1) and 1989 04 20 GMT00-1989 04 21 GMT00(case 2), are studied and the distributions of SO 2 and SO 2- 4 in East Asia are shown. It is revealed that the patterns of distributions of SO 2 and SO 2- 4 are different under different meteorological conditions. In the upper layer, the concentrations of SO 2 and SO 2- 4 are 0.4-1.0?μg/m 3 and 0.2-0.5?μg/m 3, 4.0-10.0?μg/m 3 and 2.0-6.0?μg/m 3 in the middle layer. In the surface layer, the levels of SO 2 range from 4.0 to 30.0?μg/m 3 and from 2.0 to 8.0?μg/m 3 for SO 2- 4. Distributions of SO x are controlled by emissions in the surface layer, while in the upper layer it is mainly affected by precipitation. The distributions of SO x show the interaction of emissions, winds and precipitation in the middle layer.
