中国硫沉降数值模拟

采用致酸污染物长距离传输模型ATMOS,对我国2002年排放的SO2所产生的S沉降分布进行了数值模拟研究.分别将模式输出的ρ(SO2),SO42-湿沉降量与实际监测地面层的ρ(SO2),降水中SO42-湿沉降量进行相关性分析;对我国总S沉降、地面层ρ(SO2)分布,以及S干、湿沉降分布特点等模拟结果进行详细分析.在此基础上,得到模拟各网格的总S沉降数值,将其与相应的S沉降临界负荷值进行比较,获得95%保证率(RAINS-Asia)下我国1°×1°S沉降超临界负荷分布图.为控制我国的S沉降,对各省SO2减排的形势进行分析,并提出具体要求.

Numerical Simulation of Sulfur Deposition in China

By using a long-range transport model for pollutants which can result in acid,ATMOS,the sulfur deposition caused by sulfur dioxide emission over Mainland China in 2002 was simulated.Correlation analysis was performed between modeling results and monitoring data of SO₂ mass concentration in the surface air and SO₄^2- wet deposition.A series of analysis about the total sulfur deposition,SO₂ surface mass concentration,and dry/wet deposition distribution characters were carried out based on the simulated results.By comparing the modeling total sulfur deposition with critical load of sulfur deposition in each grid over the entire Mainland,a layout map of an excess of critical load with 95% factor of assurance(RAINS-Asia)for sulfur deposition within a grid 1°×1° in China was obtained.Furthermore,the requirement of SO₂ emission abatement in each province for controlling sulfur deposition in China was discussed.