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

查看全文 作　　者：Hui [1]He;Xuexi [2,3]Tie;Qiang [1]Zhang;Xiange [1]Liu;Qian [1]Gao;Xia [1]Li;Yang [1]Gao

机构地区：[1]Beijing Weather Modification Office;[2]Key Laboratory of Aerosol Science and Technology,SKLLQG,Institute of Earth Environment,Chinese Academy of Sciences;[3]National Center for Atmospheric Research

出　　处：《Particuology》索引2015年第13卷第3期,共9页

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 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 to100 μg/kg on January 19,2013,characterizing a large variability in a very short period.This strong variability 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 PM_(2.5) concentration.Under the shallow PBL height,aerosol particles were strongly confined near the surface,producing a high surface PM_(2.5) concentration.The sensitivity model study suggests that the local emissions(emissions from the Beijing region only)were the major cause for the heavy haze events.With only local emissions,the calculated peak value of the PM_(2.5) concentration was 350 μg/kg,which accounted for 78%of the measured peak value(450 μg/kg).In contrast,without the local emissions,the calculated peak value of the PM_(2.5) concentration was only100 μg/kg,which accounted for 22%of the measured peak value. 关键词：北京地区气溶胶污染原因颗粒浓度气溶胶颗粒气溶胶粒子案例中国

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

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