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https://doi.org/10.5194/acp-2018-548
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-548
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 19 Oct 2018

Research article | 19 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Impacts of short-term mitigation measures on PM2.5 and radiative effects: a case study from a regional background site near Beijing, China

Qiyuan Wang1, Suixin Liu1, Nan Li2, Wenting Dai1, Yunfei Wu3, Jie Tian4, Yaqing Zhou1, Meng Wang1, Steven Sai Hang Ho1, Yang Chen5, Renjian Zhang3, Shuyu Zhao1, Chongshu Zhu1, Yongming Han1,6, Xuexi Tie1, and Junji Cao1,7 Qiyuan Wang et al.
  • 1Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
  • 2School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 3Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 4Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 5Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
  • 6School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
  • 7Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China

Abstract. An intensive measurement campaign was conducted in a regional background site near Beijing during the 19th National Congress of the Communist Party of China (NCCPC) to investigate the effectiveness of short-term mitigation measures on PM2.5 and aerosol direct radiative forcing (DRF). Average mass concentration of PM2.5 and its major chemical composition are decreased by 20.6–43.1% during the NCCPC control period compared with the non-control period. When considering days with the stable meteorological conditions, larger reduction of PM2.5 is found compared with that for all days. Further, a positive matrix factorization receptor model shows that the mass concentrations of PM2.5 from traffic-related emissions, biomass burning, industry processes, and mineral dust are reduced by 38.5–77.8% during the NCCPC control period compared with the non-control period. However, there is no significant difference in PM2.5 from coal burning between these two periods, and an increasing trend of PM2.5 mass from secondary inorganic aerosol is found during the NCCPC control period. Two pollution episodes were occurred subsequently after the NCCPC control period. One is dominated by secondary inorganic aerosol, and the WRF-Chem model shows that the Beijing-Tianjin-Hebei (BTH) region contributes 73.6% of PM2.5 mass; the other is mainly caused by biomass burning, and the BTH region contributes 46.9% of PM2.5 mass. Calculations based on a revised IMPROVE method show that organic matter (OM) is the largest contributor to the light extinction coefficient (bext<\sub>) during the non-control period while NH4NO3 is the dominant contributor during the NCCPC control period. The Tropospheric Ultraviolet and Visible radiation model reveals that the average DRF values at the Earth's surface are −14.0 and −19.3Wm-2 during the NCCPC control and non-control periods, respectively, and the reduction ratios of DRF due to the decrease in PM2.5 components vary from 22.7–46.7% during the NCCPC control period. Our study would further provide valuable information and dataset to help controlling the air pollution and alleviating the cooling effects of aerosols at the surface in Beijing.

Qiyuan Wang et al.
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