Acidity of Aerosols during Winter Heavy Haze Events in Beijing and Gucheng, China

查看全文 作　　者：Xiyuan [1]CHI;Pengzhen [1]HE;Zhuang [1]JIANG;Xiawei [1]YU;Fange [1]YUE;Longquan [1]WANG;Bokun [1]LI;Hui [1]KANG;Cheng [1,2]LIU;Zhouqing [1,2]XIE

机构地区：[1]Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences,University of Science and Technology of China;[2]Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences

出　　处：《Journal of Meteorological Research》索引2018年第32卷第1期,共12页

基　　金：Supported by the National Key Project of Ministry of Science and Technology of China(2016YFC0203302);National Natural Science Foundation of China(91544103) 摘　　要：We investigated the acidity and concentrations of water-soluble ions in PM_(2.5) aerosol samples collected from an urban site in Beijing and a rural site in Gucheng, Hebei Province from November 2016 to January 2017 to gain an insight into the formation of secondary inorganic species. The average SO_4^(2–), NO_3~–, and NH_4^+ concentrations were 8.3,12.5, and 14.1 μg m^(–3), respectively, at the urban site and 14.0, 14.2, and 24.2 μg m^(–3), respectively, at the rural site.The nitrogen and sulfur oxidation ratios in urban Beijing were correlated with relative humidity(with correlation coefficient r = 0.79 and 0.67, respectively) and the aerosol loadings. Based on a parameterization model, we found that the rate constant of the heterogeneous reactions for SO_2 on polluted days was about 10 times higher than that on clear days, suggesting that the heterogeneous reactions in the aerosol water played an essential role in haze events.The ISORROPIA II model was used to predict the aerosol pH, which had a mean(range) of 5.0(4.9–5.2) and 5.3(4.6–6.3) at the urban and rural site, respectively. Under the conditions with this predicted pH value, oxidation by dissolved NO_2 and the hydrolysis of N_2O_5 may be the major heterogeneous reactions forming SO_4^(2–) and NO_3~– in haze.We also analyzed the sensitivity of the aerosol p H to changes in the concentrations of SO_4^(2–), NO_3~–, and NH_4^+ under haze conditions. The aerosol p H was more sensitive to the SO_4^(2–) and NH_4^+ concentrations with opposing trends, than to the NO_3~– concentrations. The sensitivity of the p H was relatively weak overall, which was attributed to the buffering effect of NH_3 partitioning. 关键词：喷雾器北京酸味事件冬季中国 PM2.5 关联系数

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Acidity of Aerosols during Winter Heavy Haze Events in Beijing and Gucheng, China

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