The Long-term Characteristics of Aerosol Variation in Taihu Lake Area

• 1、Nanjing University of Information Science & Technology,Nanjing Jiangsu,210044

Abstract：The long-term variation characteristics of aerosol optical parameters such as AOD, wavelength index, Single Scattering Albedo (SSA) and size distribution in Taihu area were analyzed by using the level 1.5 data of AERONET Taihu station from January 2006 to December 2015. The results show that there is an inverse correlation between AOD and wavelength index, and their range is mainly concentrated between [0,2]. The frequency distribution of AOD in spring, autumn and winter presented a single peak mode. The annual mean value of wavelength index gradually increased from 2007, and decreased slightly after 2011. The seasonal change was the largest in autumn, and the proportion of coarse particles in spring and summer was significantly greater than that in autumn and winter. SSA is larger in summer and autumn, but smaller in winter. The maximum monthly mean value appeared in September, and the minimum value appeared in March and June and the dispersion degree of four seasons is not much different. The size distribution presents a bimodal structure, with coarse particle mode as the main mode in spring, fine particle mode as the main mode in summer, and similar shape of coarse and fine particle volume spectrum in autumn and winter.

Keywords： Aersol Optical Depth Wavelength Index Single Scattering Albedo Size Distribution Taihu