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Modeling the feedback between aerosol and boundary layer processes: a case study in Beijing, China

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Abstract

Rapid development has led to frequent haze in Beijing. With mountains and sea surrounding Beijing, the pollution is found to be influenced by the mountain-plain breeze and sea-land breeze in complex ways. Meanwhile, the presence of aerosols may affect the surface energy balance and impact these boundary layer (BL) processes. The effects of BL processes on aerosol pollution and the feedback between aerosol and BL processes are not yet clearly understood. Thus, the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) is used to investigate the possible effects and feedbacks during a haze episode on 23 September 2011. Influenced by the onshore prevailing wind, sea-breeze, and upslope breeze, about 45 % of surface particulate matter (PM)2.5 in Beijing are found to be contributed by its neighbor cities through regional transport. In the afternoon, the development of upslope breeze suppresses the growth of BL in Beijing by imposing a relatively low thermal stable layer above the BL, which exacerbates the pollution. Two kinds of feedback during the daytime are revealed as follows: (1) as the aerosols absorb and scatter the solar radiation, the surface net radiation and sensible heat flux are decreased, while BL temperature is increased, resulting in a more stable and shallower BL, which leads to a higher surface PM2.5 concentration in the morning and (2) in the afternoon, as the presence of aerosols increases the BL temperature over plains, the upslope breeze is weakened, and the boundary layer height (BLH) over Beijing is heightened, resulting in the decrease of the surface PM2.5 concentration there.

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Acknowledgments

We thank Dr. Xiaoming Hu from University of Oklahoma for important advice. We thank Tsinghua University for providing the MEIC inventory. This work was supported by the National Sciences Foundation of China (Grant no. 41175004, 41465001), the China Meteorological Administration Special Public Welfare Research Fund (GYHY201106033), and the China Scholarship Council (CSC).

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Correspondence to Yucong Miao or Shuhua Liu.

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The authors declare that they have no competing interests.

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Responsible editor: Gerhard Lammel

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Miao, Y., Liu, S., Zheng, Y. et al. Modeling the feedback between aerosol and boundary layer processes: a case study in Beijing, China. Environ Sci Pollut Res 23, 3342–3357 (2016). https://doi.org/10.1007/s11356-015-5562-8

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  • DOI: https://doi.org/10.1007/s11356-015-5562-8

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