WANG Fanqiang;XU Dahai;SHI Jingang;CHEN Xiaoli
Based on the SO2 emission inventory and meteorological data along the middle-up stream of Yellow River in 2007, the simulation system including CALPUFF and MM5 models is utilized to simulate, predict and analyze the interaction of SO2 emission between one city and other 18 cities, and the contribution of their transport to Beijing city. From the results, the following conclusions can be reached. (1) It is obvious that the SO2 emission dramatically interacts with that around the circumjacent cities, in the second level (0.06mg/m3) of National Standard of SO2 emission, 49.8% and 44.3% of average yearly SO2 concentration in Yinchuan and Xianyang cities are contributed by that around the circumjacent cities, respectively. (2) The city whose contribution to neighboring city exceeds 10% of the second level includes Shizuishan to Yinchuan, Wuzhong to Yinchuan, Weinan to Xiangyang, Weinan to Tongchuan, and Xiangyang to Weinan. (3) The long distance transport of SO2 emission from adjacent cities influences to some extent the concentration of SO2 in Beijing city, the contribution of average yearly SO2 concentration to Beijing reaches 0.00038mg/m3 with the largest in Ordos,followed by Baotou, 0.00032mg/m3, and is only 0.00001mg/m3, the smallest for Baoji and Xinzhou and Yanan and Zhongwei and Tongchuan; the contribution of the maximum daily SO2 concentration to Beijing is Ordos with an extreme value of 0.005404mg/m3, followed by Xinzhou, 0.00414mg/m3, and is the minimum for Yanan, 0.00008mg/m3; the contribution of the maximum hourly SO2 concentration to Beijing is Xinzhou with an extreme value of 0.03708mg/m3, followed by Ordos, 0.01815mg/m3, and is the minimum for Zhongwei, 0.00029mg/m3. (4) For the purpose of improving the air quality, it is critical that its contribution to the surrounding regions should be circumscribed in addition to the consideration of its local influence in the pollution control and countermeasure of a single city.