Analysis of aerosol optical properties and meteorological parameters in a severe haze-fog episode in Beijing
WANG Shuo1,2, ZHAO Wei-xiong1, XU Xue-zhe1,2, ZHANG Qi-lei1,2, QIAN Xiao-dong1,2, FANG Bo1, WANG Jing4, ZHANG Wei-jun1,3
1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2. Graduate School, University of Science and Technology of China, Hefei 230026, China;
3. School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China;
4. School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China
Results of aerosol optical properties research during a severe haze-fog episode from 2 October to 7 October 2013 in Beijing were studied. The meteorological effects on the haze-fog process were investigated, and the pollution sources were analyzed with the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. The values of aerosol optical thickness (AOT), Ångström wavelength exponent (AE), and the peak of aerosol volume size concentration in fine mode in polluted days were much higher than that of clean days. The daily average single scattering albedo (SSA) increased with the increasing of wavelength in the earlier and later period of the intensive haze-fog episode. On October 5, the most serious haze process was happened and the AOT of wavelength 440nm was raised as much as 3.89. The SSA firstly increased and then decreased with the increasing of wavelength. The maximum SSA value was 0.965 at the wavelength of 675nm. During the haze-fog episode, fine particles with strong scattering characteristics were dominated which was mainly contributed by human factors, and was significantly influenced by meteorological parameters.
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