Abstract：A heavy air pollution process in Beijing on 7~11 October, 2014 was analyzed through vertical observation, ground-based observation and monitoring results of chemical components of PM2.5. The results showed that the surface-level backscatter density and extinction coefficient increased significantly during the heavy pollution, which suggested that air pollutants accumulated near the ground. Compared with the normal days, wind speed was weaker, and relative humidity was higher and surface pressure was lower during the heavy pollution. According to the trends of PM2.5 concentrations, this heavy pollution process was divided into four stages, including two-step type concentration climbing stages (P1and P2), high concentration maintenance stage (P3) and rapid cleanup stage (P4). Through analysis on ground-based observation, remote-sensing retrieval and chemical components of PM2.5, it could be concluded that regional transmission, including straw burning, was the main incentive of this heavy pollution. Regional transmission and accumulation of local pollutant emission maintained and aggravated the heavy pollution. Atmospheric oxidants OX showed significant positive correlation with concentrations of PM2.5 and secondary ions, which suggested that strong atmospheric oxidation promoted the increase of PM2.5 concentrations.
王占山, 李云婷, 孙峰, 邱启鸿, 张大伟, 姜磊, 周一鸣, 潘丽波. 2014年10月上旬北京市大气重污染分析[J]. 中国环境科学, 2015, 35(6): 1654-1663.
WANG Zhan-Shan, LI Yun-Ting, SUN Feng, QIU Qi-Hong, ZHANG Da-Wei, JIANG Lei, ZHOU Yi-Ming, PAN Li-Bo. Analysis on heavy air pollution in Beijing in early October, 2014. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(6): 1654-1663.
