- 期刊
- OpenAccess
Aerosol Impacts on Meteorological Elements and Surface Energy Budget over an Urban Cluster Region in the Yangtze River Delta
摘要
The Yangtze River Delta (YRD) is a typical example of regions that are dramatically influenced by both human activity and a monsoonal climate. Data on the near-surface micro-meteorology, radiation, and energy fluxes were collected and analyzed at the Lishui field observation site in the suburb of Nanjing to investigate aerosol impacts on the radiation budget and land surface-atmosphere heat, water, and mass exchanges. Cluster analysis, composite analysis, and case study were applied to selected typical polluted/non-polluted days. The results indicate that the mean daily surface pressure is 6.6 hPa lower on polluted than non-polluted days in Nanjing. Northeasterly winds often prevail on the polluted days, with wind speeds being 60% lower than on non-polluted days. Aerosols directly reduce the net radiation flux at the surface, with a maximum reduction of 180 W m^(-2). During the early stage of air pollution events, the surface pressure is lower, and wind speeds rapidly decrease, whereas during the peak of pollution, low surface pressure and wind speeds linger, effectively preventing the dispersion of air pollutants. Meanwhile, the temperature often decreases, and the relative humidity subsequently increases. As the wind speed and surface pressure increase, the AQI gradually decreases, and the air pollution event ends.
延伸閱讀
- Wang, T. J., Jiang, F., Li, S., & Liu, Q. (2007). Trends in Air Pollution during 1996-2003 and Cross-Border Transport in City Clusters over the Yangtze River Delta Region of China. Terrestrial, Atmospheric and Oceanic Sciences, 18(5), 995-1009. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200712-18-5-995-1009-a
- Fan, Q., Lan, J., Liu, Y., Wang, X., Chan, P., Fan, S., Hong, Y., Liu, Y., Zeng, Y., Liang, G., & Feng, Y. (2015). Diagnostic Analysis of the Sulfate Aerosol Pollution in Spring over Pearl River Delta, China. Aerosol and Air Quality Research, 15(1), 46-57. https://doi.org/10.4209/aaqr.2014.03.0041
- Huang, Z. J., Ou, J. M., Zheng, J. Y., Yuan, Z. B., Yin, S. S., Chen, D. H., & Tan, H. B. (2016). Process Contributions to Secondary Inorganic Aerosols during Typical Pollution Episodes over the Pearl River Delta Region, China. Aerosol and Air Quality Research, 16(9), 2129-2144. https://doi.org/10.4209/aaqr.2015.12.0668
- Xiao, Z. Y., Jiang, H., Zhou, G. M., Chen, J., & Zhang, R. J. (2013). Characteristics of Aerosol Optical Thickness as Well as the Relationship with NDVI in the Yangtze River Delta, China. Terrestrial, Atmospheric and Oceanic Sciences, 24(5), 863-876. https://doi.org/10.3319/TAO.2013.05.02.01(A)
- Jiang, Q., Wang, F., & Sun, Y. (2019). Analysis of Chemical Composition, Source and Processing Characteristics of Submicron Aerosol during the Summer in Beijing, China. Aerosol and Air Quality Research, 19(6), 1450-1462. https://doi.org/10.4209/aaqr.2018.12.0480