Wavelet Analysis on SO2 Pollution Index Changes of Shanghai in Recent 10 Years
基于小波变换的上海市近10年SO2污染指数的变化

Based on the continuous Mexican Hat wavelet transformation of time series of daily SO_2 pollution index during last 10 years in Shanghai,the multiscale variations,primary period,catastrophe point and influencing factors are analyzed.The result shows that periodical fluctuation of SO_2 pollution index varies at diverse time-scales,and the primary period of the daily variations is about 100 days;pollution pattern takes on serious in winter and light in summer in most scales due to meteorological conditions,an...