Understanding unusually high levels of peroxyacetyl nitrate(PAN) in winter in Urban Jinan,China

查看全文 作　　者：Lu [1]Liu;Xinfeng [1]Wang;Jianmin [1,2,3]Chen;Likun [1,3]Xue;Wenxing [1]Wang;Liang [1]Wen;Dandan [1]Li;Tianshu [1]Chen

机构地区：[1]Environment Research Institute,School of Environmental Science and Engineering,Shandong University;[2]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention,Department of Environmental Science and Engineering,Institute of Atmospheric Sciences,Fudan University;[3]Institute for Climate and Global Change Research,School of Atmospheric Sciences,Nanjing University

出　　处：《Journal of Environmental Sciences》索引2018年第30卷第9期,共12页

基　　金：supported by the National Key R&D Program of China(No.2016YFC0202700);the National Natural Science Foundation of China(Nos.41375126,21527814,91743202);the H2020 Marie Sklodowska-Curie Actions(No.H2020-MSCARISE-2015-690958) 摘　　要：Peroxyacetyl nitrate(PAN), as a major secondary pollutant, has gained increasing worldwide attentions, but relevant studies in China are still quite limited. During winter of 2015 to summer of 2016, the ambient levels of PAN were measured continuously by an automatic gas chromatograph equipped with an electron capture detector(GC–ECD) analyzer at an urban site in Jinan(China), with related parameters including concentrations of O3, NO, NO_2, PM_(2.5), HONO,the photolysis rate constant of NO_2 and meteorological factors observed concurrently. The mean and maximum values of PAN concentration were(1.89 ± 1.42) and 9.61 ppbv respectively in winter, and(2.54 ± 1.44) and 13.47 ppbv respectively in summer. Unusually high levels of PAN were observed during severe haze episodes in winter, and the formation mechanisms of them were emphatically discussed. Study showed that high levels of PAN in winter were mainly caused by local accumulation and strong photochemical reactions during haze episodes, while mass transport played only a minor role. Accelerated photochemical reactions(compared to winter days without haze) during haze episodes were deduced by the higher concentrations but shorter lifetimes of PAN, which was further supported by the sufficient solar radiation in the photolysis band along with the high concentrations of precursors(NO_2, VOCs) and HONO during haze episodes. In addition, significant PAN accumulation during calm weather of haze episodes was verified by meteorological data. 关键词：Peroxyacetyl nitrate WINTER Haze episodes North China Plain

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Understanding unusually high levels of peroxyacetyl nitrate(PAN) in winter in Urban Jinan,China

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