上海地区O3与NO2时空特征数值模拟个例研究

Case study on the numerical simulations of the characteristics of temporal and spatial distributions of O_3 and NO_2 in Shanghai Area

采用Metphomod数值模式,在2004年四季中各选取一个API指数相对较高的个例,研究上海地区大气污染物的时空分布特征.模式的检验表明,在夏季时段的模拟效果最为理想,基本能够反映上海地区主要大气污染物浓度分布特征和变化规律.以2004年6月7、8日的个例分析显示,NO2的浓度日变化比较复杂,O3则以单峰型分布为主;在空间分布上,上海地区的NO2、O3浓度主要受到天气背景、局地气象场分布、污染源排放等因素的影响;在局地污染物排放较强的市区,O3和NO的浓度变化存在一定的负相关,而在局地污染物排放较小、污染物主要来自扩散输送的地区,O3和NO2的浓度之间有着较明显的负相关.

A numerical simulation software Metphomod （Meteorology Photochemistry Model） was applied in Shanghai City to simulate the temporal and spatial distributions of SO2, NO2, NO and O3 in one episodes with high API index for each season in 2004. The resuts were best in summer and revealed the fundamental distribution patterns of the main air pollutants in Shanghai Area. The studies on June 7 and 8 in 2004 showed that the daily variation of concentrations of NO2 was relatively complex, while that of 03 mainly belonged to the single-peak pattern. The weather backgrounds, local meteorological conditions and pollution emissions were the major factors which influence the spatial distributions of air pollutants in Shanghai. In the region at high pollutant emission level, the correlation between the concentrations ofO3 and NO2 was not significant, but the variation of the concentration O3 negatively correlated to that of NO; while in the region where local emission level was low and pollutants mainly transported from other places, the variations of O3 and NO2 were negatively correlated.