Characteristics and formation mechanism of regional haze episodes in the Pearl River Delta of China

查看全文 作　　者：Wenguang [1]Li;Xingang [1]Liu;Yuanhang [2]Zhang;Kang [2]Sun;Yusheng [2]Wu;Rui [2]Xue;Limin [2]Zeng;Yu [3]Qu;Junling [3]An

机构地区：[1]State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 10087S,China;[2]State Key Joint Laboratory of Environment Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China;[3]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,ChineseAcademy of Sciences,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》索引2018年第30卷第1期,共14页

基　　金：supported by the National Natural Science Foundation of China(No.91544221);the Ministry of Environmental Protection of the People's Republic of China(No.201509001);the Ministry of Science and Technology of the People's Republic of China(No.XDB05010500) 摘　　要：To investigate the characteristics and the specific mechanism of continuous haze,comprehensive measurements were conducted from 15 October to 19 November in the Atmospheric Environment Monitoring Super-Station in Heshan of Guangdong province.Five haze episodes occurred in October and November 2014 in the Pearl River Delta(PRD)region. The meteorological parameters, gas data, chemical compositions, and optical parameters of the aerosols were obtained. Among these events, the second haze episode,with the highest concentration of PM2.5 of 187.51 μg/m^3, was the most severe. NO^3-was always higher than SO_4^(2-), which indicated that motor vehicles played an important role in the haze, even though the oxidation rate from SO_2 to SO_4^(2-)was faster than that of NOXto NO_3^-. The difference between the hourly averages of Na+and K+during the haze episode and clean days was small, implying that straw combustion and sea salt had no significant effect on the occurrence of haze, and the backward trajectories of the air masses also conformed with this result. The air pollutants were difficult to disperse because of the significant decrease in the planetary boundary layer(PBL) height. Relative humidity played a crucial role in the formation of haze by leading to hygroscopic growth of the diameter of aerosols. 关键词：三角洲特征和事件机制珍珠地区性中国 PM2.5

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Characteristics and formation mechanism of regional haze episodes in the Pearl River Delta of China

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