Role of secondary aerosols in haze formation in summer in the Megacity Beijing

查看全文 作　　者：Tingting [1]Han;Xingang [1]Liu;Yuanhang [2]Zhang;Yu [3]Qu;Limin [2]Zeng;Min [2]Hu;Tong [2]Zhu

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

出　　处：《Journal of Environmental Sciences》索引2015年第27卷第5期,共10页

基　　金：supported by the National Natural Science Foundation of China (Nos. 41475113, 41175018);the CAS Strategic Priority Research Program (No. XDB05010500) 摘　　要：A field experiment from 18 August to 8 September 2006 in Beijing, China, was carried out. A hazy day was defined as visibility < 10 km and RH(relative humidity) < 90%. Four haze episodes, which accounted for ~ 60% of the time during the whole campaign, were characterized by increases of SNA(sulfate, nitrate, and ammonium) and SOA(secondary organic aerosol) concentrations. The average values with standard deviation of SO2-+4, NO-3, NH4 and SOA were 49.8(± 31.6), 31.4(±22.3), 25.8(±16.6) and 8.9(±4.1) μg/m3, respectively, during the haze episodes, which were 4.3, 3.4, 4.1, and 1.7 times those in the non-haze days. The SO2-4,NO-3, NH+4, and SOA accounted for 15.8%, 8.8%, 7.3%, and 6.0% of the total mass concentration of PM10 during the non-haze days. The respective contributions of SNA species to PM10 rose to about27.2%, 15.9%, and 13.9% during the haze days, while the contributions of SOA maintained the same level with a slight decrease to about 4.9%. The observed mass concentrations of SNA and SOA increased with the increase of PM10 mass concentration, however, the rate of increase of SNA was much faster than that of the SOA. The SOR(sulfur oxidation ratio) and NOR(nitrogen oxidation ratio) increased from non-haze days to hazy days, and increased with the increase of RH. High concentrations of aerosols and water vapor favored the conversion of SO2 to SO2-4and NO2 to NO-3, which accelerated the accumulation of the aerosols and resulted in the formation of haze in Beijing. 关键词：二次有机气溶胶灰霾北京大都市质量浓度夏季可吸入颗粒物 PM10

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Role of secondary aerosols in haze formation in summer in the Megacity Beijing

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