One year measurements of Mie scatter lidar at Beijing were performed between June 2009 and May 2010. First of all, the data were split into four seasons:Spring(March-May), Summer(June-August), Autumn(September-November), and Winter(December-February). Next, the data were quality controlled. At last, Change of daily mean values of aerosol backscattering coefficient, extinction coefficient, AOT, and atmospheric boundary layer(ABL) were analyzed. At the same time, the vertical profiles of the aerosol backscattering coefficient, extinction coefficient, their variability during each season, the annual average, and the statistics were calculated, the characteristics of the AOT and the planetary boundary layer were also presented. The analyses revealed that, the average daily characteristics of the aerosol extinction coefficient and backscattering coefficient were the same, and the extinction coefficient was about 10 times of the backscattering coefficient. The seasonal mean aerosol backscatter and the extinction profiles did not exhibit significant seasonal differences in structural characteristics. The maximum decrement of the backscatter coefficients and extinction coefficient occurs within 1km above ground. The vertically averaged(between 0.15~3.0km) backscatter and extinction coefficients had the highest averages value(31.2Mm-1·sr-1 and 517.0Mm-1, respectively) in summer, which reflects the stronger convection during summer. The winter had the lowest aerosol backscatter and extinction coefficients. For winter and spring seasons, 700m was the height where these two quantities showed different trend. Above 700m, the backscattering coefficient and extinction coefficient in spring were higher than those in winter. The fluctuations of daily average AOT and ABL height were significant, and the maximum amplitudes appeared in spring. On average, the residual layer and PBL were the highest in spring(3450 m and 970 m respectively), and the lowest in winter(2970 m and 604 m respectively). In spring and summer, the fluctuation of AOT varied greatly, but the fluctuation in autumn and winter was relatively mild. The average AOT in spring, summer, autumn, and winter is 0.689, 0.699, 0.571, and 0.647 respectively.
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WANG Yao-ting, MIAO Shi-guang, ZHANG Xiao-ling. Seasonal characteristics of the aerosol optical parameters based on lidar over the Beijing Area. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(4): 970-978.
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