Analysis of the causes of heavy aerosol pollution in Beijing,China:A case study with the WRF-Chem model

作     者：Hui He Xuexi Tie Qiang Zhang Xiange Liu Qian Gao Xia Li Yang Gao 

作者机构：Beijing Weather Modification Office Key Laboratory of Aerosol Science and TechnologySKLLQGInstitute of Earth EnvironmentChinese Academy of Sciences National Center for Atmospheric Research 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第3期

页      面：32-40页

核心收录：

学科分类：07[理学] 0817[工学-化学工程与技术] 070602[理学-大气物理学与大气环境] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by National Science Foundation of China(NSFC) under Grant No.41205100,41275186, 41175007 National Department Public Benefit Research Foundation of China under Grant No.GYHY201306065 The National Center for Atmospheric Research,U.S.is sponsored by the National Science Foundation,U.S 

主　　题：PM2.5 in BeijingCauses of heavy hazePlanetary boundary layer (PBL)WRF Chem model 

摘      要：The causes and variability of a heavy haze episode in the Beijing region was analyzed. During the episode, the PM2.5 concentration reached a peak value of 450 μg/kg on January 18, 2013 and rapidly decreased to 100μg/kg on January 19, 2013, characterizing a large variability in a very short period. This strong vari- ability provides a good opportunity to study the causes of the haze formation. The in situ measurements （including surface meteorological data and vertical structures of the winds, temperature, humidity, and planetary boundary layer （PBL）） together with a chemical/dynamical regional model （WRF-Chem） were used for the analysis. In order to understand the rapid variability of the PM2.5 concentration in the episode, the correlation between the measured meteorological data （including wind speed, PBL height, relative humidity, etc.） and the measured particle concentration （PM2.5 concentration） was studied. In addition, two sensitive model experiments were performed to study the effect of individual contribution from local emissions and regional surrounding emissions to the heavy haze formation. The results suggest that there were two major meteorological factors in controlling the variability of the PM2.5 concentration, namely, surface wind speed and PBL height. During high wind periods, the horizontal transport of aerosol particles played an important role, and the heavy haze was formed when the wind speeds were very weak （less than 1 m/s）. Under weak wind conditions, the horizontal transport of aerosol particles was also weak, and the vertical mixing of aerosol particles played an important role. As a result, the PBL height was a major factor in controlling the variability of the PM2.5 concentration. Under the shallow PBL height, aerosol particles were strongly confined near the surface, producing a high surface PM2.5 concentration. The sensitivity model study suggests that the local emissions （emissions from the Beijing region only） were the major cause for