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题名: Distinct potential aerosol masses under different scenarios of transport at a suburban site of Beijing
作者: Chu, Biwu; Liu, Yongchun; Ma, Qingxin; Ma, Jinzhu; He, Hong; Wang, Gang; Cheng, Shuiyuan; Wang, Xinming
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期: 2016-01
卷号: 39, 期号:0, 页码:52-61
关键词: Potential aerosol mass ; Local emission ; Long distance transport ; Aging ; In situ perturbation experiments
DOI: 10.1016/j.jes.2015.11.003
部门归属: 大气污染控制中心
英文摘要: In order to evaluate the secondary aerosol formation potential at a suburban site of Beijing, in situ perturbation experiments in a potential aerosol mass (PAM) reactor were carried out in the winter of 2014. The variations of secondary aerosol formation as a function of time, OH exposure, and the concentrations of gas phase pollutants and particles were reported in this study. Two periods with distinct secondary aerosol formation potentials, marked as Period I and Period II, were identified during the observation. In Period I, the secondary aerosol formation potential was high, and correlated well to the air pollutants, i. e., SO2, NO2, and CO. The maximal secondary aerosol formation was observed with an aging time equivalent to about 3 days of atmospheric oxidation. In period II, the secondary aerosol formation potential was low, with no obvious correlation with the air pollutants. Meanwhile, the aerosol mass decreased, instead of showing a peak, with increasing aging time. Backward trajectory analysis during the two periods confirmed that the air mass in Period I was mainly from local sources, while it was attributed mostly to long distance transport in Period II. The air lost its reactivity during the long transport and the particles became highly aged, resulting in a low secondary aerosol formation potential. Our experimental results indicated that the in situ measurement of the secondary aerosol formation potential could provide important information for evaluating the contributions of local emission and long distance transport to the aerosol pollution. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35741
Appears in Collections:大气污染控制中心_期刊论文

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