Characteristics of Haze Pollution Episodes and Analysis of a Typical Winter Haze Process in Shanghai
Zhao, MF; Xiu, GL; Qiao, T; Li, YL; Yu, JZ; Xiu, GL (reprint author), E China Univ Sci & Technol, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China.; Xiu, GL (reprint author), ACC AQSM, Brisbane, Qld, Australia.
2016
发表期刊AEROSOL AND AIR QUALITY RESEARCH
ISSN1680-8584
卷号16期号:7页码:1625-1637
文章类型期刊论文
摘要One-year field campaign was conducted from July 2013 to August 2014 at the site of East China University of Science and Technology (ECUST) in urban Shanghai, and mass concentrations and chemical compositions of PM2.5 were measured. Gaseous pollutants (SO2, NO2) and meteorological parameters (wind speed, wind direction, pressure, temperature and relative humidity) were simultaneously obtained. In this study, PM2.5 mass balances on haze and non-haze days were reconstructed and the sum of secondary inorganic aerosols (SIA) and organic matter (OM) accounted for over 80%. The fraction of nitrate in SIA was much higher on haze days than that on non-haze days, while the corresponding fraction of ammonium was lower, implying that the variations of the sources and formation processes of SIA on haze days. In theory, sulfate and nitrate might be almost fully neutralized by ammonium. Moreover, the sulfur oxidation ratio (SOR) values were much higher than the nitrogen oxidation ratio (NOR) values, indicating the greater oxidation capacity of SO2 would occur. On haze days, the high NOR values could be explained by the relatively low temperature, the high NO2 concentration and the potential dominant gas-phase reaction. As for secondary organic aerosol (SOA), the formation processes were usually associated with nitrate formation. In winter, haze pollution episodes occurred more frequently than those in other seasons, associated with the different features of wind speed, wind direction and 72-h backward trajectory. In addition, one case from 17 November 2013 to 4 January 2014 was selected to investigate the formation mechanism of haze pollution episodes. The key factors that affected the haze formation might be the local stable synoptic conditions including weak surface wind, surface temperature inversion and high relative humidity, the long-range transportations from the Northwest and the large amounts of emissions from local sources.
关键词Haze Pollution Episode Pm2.5 Secondary Inorganic Aerosols (Sia) Secondary Organic Aerosols (Soa) Meteorological Conditions
DOI10.4209/aaqr.2016.01.0049
收录类别SCI
语种英语
WOS记录号WOS:000378942400010
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/26445
专题中科院上海应用物理研究所2011-2018年
通讯作者Xiu, GL (reprint author), E China Univ Sci & Technol, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China.; Xiu, GL (reprint author), ACC AQSM, Brisbane, Qld, Australia.
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Zhao, MF,Xiu, GL,Qiao, T,et al. Characteristics of Haze Pollution Episodes and Analysis of a Typical Winter Haze Process in Shanghai[J]. AEROSOL AND AIR QUALITY RESEARCH,2016,16(7):1625-1637.
APA Zhao, MF.,Xiu, GL.,Qiao, T.,Li, YL.,Yu, JZ.,...&Xiu, GL .(2016).Characteristics of Haze Pollution Episodes and Analysis of a Typical Winter Haze Process in Shanghai.AEROSOL AND AIR QUALITY RESEARCH,16(7),1625-1637.
MLA Zhao, MF,et al."Characteristics of Haze Pollution Episodes and Analysis of a Typical Winter Haze Process in Shanghai".AEROSOL AND AIR QUALITY RESEARCH 16.7(2016):1625-1637.
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