Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China

查看全文 作　　者：Kang [1,2]Sun;Xingang [2]Liu;Jianwei [1]Gu;Yunpeng [1]Li;Yu [3]Qu;Junling [3]An;Jingli [4]Wang;Yuanhang [1]Zhang;Min [1]Hu;Fang [5]Zhang

机构地区：[1]College of Environmental Sciences and Engineering, Peking University;[2]State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University;[3]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics,Chinese Academy of Sciences;[4]Institute for Urban Meteorology,China Meteorological Administration;[5]College of Global Change and Earth System Science, Beijing Normal University

出　　处：《Journal of Environmental Sciences》索引2015年第27卷第6期,共13页

基　　金：supported by the National Natural Science Foundation of China (Nos. 41175018, 41475113);the special fund of the State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (No. LAPC-KF-2014-01) 摘　　要：Size-resolved aerosol samples were collected by MOUDI in four seasons in 2007 in Beijing. The PM10 and PM1.8mass concentrations were 166.0 ± 120.5 and 91.6 ± 69.7 μg/m^3, respectively,throughout the measurement, with seasonal variation: nearly two times higher in autumn than in summer and spring. Serious fine particle pollution occurred in winter with the PM1.8/PM10 ratio of 0.63, which was higher than other seasons. The size distribution of PM showed obvious seasonal and diurnal variation, with a smaller fine mode peak in spring and in the daytime. OM(organic matter = 1.6 × OC(organic carbon)) and SIA(secondary inorganic aerosol) were major components of fine particles, while OM, SIA and Ca_2+were major components in coarse particles. Moreover, secondary components, mainly SOA(secondary organic aerosol) and SIA,accounted for 46%–96% of each size bin in fine particles, which meant that secondary pollution existed all year. Sulfates and nitrates, primarily in the form of(NH_4)_2SO_4, NH_4NO_3, Ca SO_4, Na_2SO_4 and K_2SO_4, calculated by the model ISORROPIA II, were major components of the solid phase in fine particles. The PM concentration and size distribution were similar in the four seasons on non-haze days, while large differences occurred on haze days, which indicated seasonal variation of PM concentration and size distribution were dominated by haze days. The SIA concentrations and fractions of nearly all size bins were higher on haze days than on non-haze days, which was attributed to heterogeneous aqueous reactions on haze days in the four seasons. 关键词：季节性气溶胶灰霾化学特性北京大城市 (NH4)2SO4 颗粒物浓度

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Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China

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