Aerosol optical properties during firework, biomass burning and dust episodes over Beijing

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• 作者：Xingna YuChanzhen ShiJia MaBin ZhuMei LiJing WangSuying YangNa Kang
• 会议时间：2014-11-03
• 关键词：aerosol ; dust ; biomass burning ; firework display ; optical property
• 作者单位：Xingna Yu(Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China;Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology, Nanjing 210044, China)Chanzhen Shi(Department of Environmental Science and Engineering, Fudan University, Shanghai 200433,China)Jia Ma,Bin Zhu,Jing Wang(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology, Nanjing 210044, China)Mei Li(Atmospheric Environment Institute of Safety and Pollution Control, Jinan University,Guangzhou 510632, China)Suying Yang,Na Kang(Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China)
• 会议名称：第31届中国气象学会年会
• 会议地点：北京
• 主办单位：中国气象学会
• 语种：chi

摘要

In order to characterize the aerosol optical properties during different pollution episodes that occurred in Beijing, the aerosol loading, scattering, and size distributions are presented using solar and sky radiance measurements from 2001 to 2010 m this paper.A much higher aerosol loading than the background level was observed during the pollution episodes.The average aerosol optical depth (AOD) is largest during dust episodes coupled with the lowest (A)ngstr(o)m exponent (a), while higher AOD and lower a were more correlated with firework and biomass burning days.The total mean AOD at 440, 675, 870 and 1020 nm were 0.24, 0A9, 0.64 and 1.3g in the clean, firework display, biomass burning and dust days, respectively.The mean α for dust days was 0.51 and exceeded 1.1 for the remaining episodes.The size distribution of the dusty periods was dominated by the coarse mode, but the coarse mode was similar magnitude to the fine mode during the firework and biomass burning days.The volume concentration of the coarse mode during the dust days increased by a magnitude of more than 2~8 times that derived in the other three aerosol conditions, suggesting that dust is the major contributor of coarse mode particles in Beijing.The single scattering albedo (SSA) values also increased during the pollution episodes.The overall mean SSA at the four wavelengths were 0.865, 0.911, 0.922 and 0.931 in clean, firework display, biomass burning, and dust days in Beijing, respectively.However, in the blue spectral range, the dust aerosols exhibited pronounced absorption.