- 期刊
- OpenAccess
Characteristics of Haze Pollution Episodes and Analysis of a Typical Winter Haze Process in Shanghai
並列摘要
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 PM_(2.5) were measured. Gaseous pollutants (SO_2, NO_2) and meteorological parameters (wind speed, wind direction, pressure, temperature and relative humidity) were simultaneously obtained. In this study, PM_(2.5) 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 SO_2 would occur. On haze days, the high NOR values could be explained by the relatively low temperature, the high NO_2 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.
延伸閱讀
- Zhang, Q. Y., Yan, R. C., Fan, J. W., Yu, S. C., Yang, W. D., Li, P. F., Wang, S., Chen, B. X., Liu, W. P., & Zhan, X. Y. (2015). A Heavy Haze Episode in Shanghai in December of 2013: Characteristics, Origins and Implications. Aerosol and Air Quality Research, 15(5), 1881-1893. https://doi.org/10.4209/aaqr.2015.03.0179
- Chen, F., Zhang, X., Zhu, X., Zhang, H., Gao, J., & Hopke, P. K. (2017). Chemical Characteristics of PM_(2.5) during a 2016 Winter Haze Episode in Shijiazhuang, China. Aerosol and Air Quality Research, 17(2), 368-380(i-i). https://www.airitilibrary.com/Article/Detail?DocID=16808584-201702-201702150008-201702150008-368-380(i-i)
- Yang, M. R., Zhou, J., Dai, X. R., Pinxteren, D. V., Cao, M. Y., Li, M., & Xiao, H. (2019). Characteristics of Single Aerosol Particles during Pollution in Winter in an Urban Area of Ningbo, China. Aerosol and Air Quality Research, 19(8), 1697-1707+ap1-2. https://doi.org/10.4209/aaqr.2019.01.0038
- Jiang, H., Xiao, H., Song, H., Liu, J., Wang, T., Cheng, H., & Wang, Z. (2020). A Long-lasting Winter Haze Episode in Xiangyang, Central China: Pollution Characteristics, Chemical Composition, and Health Risk Assessment. Aerosol and Air Quality Research, 20(12), 2859-2873+s1-s11. https://doi.org/10.4209/aaqr.2020.02.0068
- Liu, X., Pan, X., Wang, Z., He, H., Wang, D., Liu, H., Tian, Y., Xiang, W., & Li, J. (2020). Chemical Characteristics and Potential Sources of PM_(2.5) in Shahe City during Severe Haze Pollution Episodes in the Winter. Aerosol and Air Quality Research, 20(12), 2741-2753+ap1-6. https://doi.org/10.4209/aaqr.2020.03.0124