临安地区地面SO2变化规律及其源地分析

利用后向轨迹的簇分析方法，研究了1994年9、10月份不同流场条件时，临安地面SO2的变化规律。采用Lagrangian传输、扩散、沉降模式计算了中国大陆以及东部较发达的几个区域对临安地面SO2的贡献。与实际观测资料对比表明，模式能够较好地模拟出临安地面SO2的浓度量级和变化趋势。同时，模式结果也表明，作为区域污染背景监测站，临安站观测的SO2浓度大小及变化趋势能反映中国东部发达地区SO2的浓度水平。

ANALYSIS OF THE SOURCE REGION AND VARIATION OF SURFACE SO2 AT LIN'AN STATION

Backward trajectory cluster analysis is used to determine the source regions and variation of surface SO 2 at Lin'an regional background station under different weather conditions in Sep. and Oct. 1994. Furthermore, by using Lagrangian transport, dispersion and deposition model, the contributions from different areas to surface SO 2 concentrations at Lin'an station are calculated. In comparison with the observations, it is shown that the model could be well to simulate the variations of surface SO 2 at Lin'an. Meanwhile, it is also shown that the concentrations and variations of surface SO 2 observed at Lin'an station could reflect those of eastern China.