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Discussion papers
https://doi.org/10.5194/acp-2019-1118
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1118
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Feb 2020

Submitted as: research article | 03 Feb 2020

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This preprint is currently under review for the journal ACP.

Simultaneous Measurement of Urban and Rural Particles in Beijing, Part II: Case Studies of Haze Events and Regional Transport

Yang Chen1, Guangming Shi1,3, Jing Cai2, Zongbo Shi4,5, Zhichao Wang1, Xiaojiang Yao1, Mi Tian1, Chao Peng1, Yiqun Han2, Tong Zhu2, Yue Liu2, Xi Yang2, Mei Zheng2, Fumo Yang1,3, and Kebin He6 Yang Chen et al.
  • 1Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
  • 2SKL-ESPC and BIC-ESAT, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 3Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
  • 4School of Geography, Earth and Environmental Sciences, the University of Birmingham, Birmingham B15 2TT, UK
  • 5Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
  • 6School of Environment, Tsinghua University, Beijing 100084, China

Abstract. Two parallel field studies were conducted simultaneously at both urban and rural sites in Beijing from 11/01/2016 to 11/29/2016. Online single-particle chemical composition analysis was used as a tracer system to investigate the impact of heating activities and the formation of haze events. Central heating elevated EC-Nit, EC-Nit-Sul, and ECOC-Nit levels by 1.5–2.0 times due to the increased use of coal in the urban areas. However, in the rural areas, residential heating which mainly consumes low-quality coal and biomass burning elevated ECOC-Nit-Sul, Nak-Nit, and OC-Sul levels by 1.2–1.5 times. Four severe haze events (hourly PM2.5 > 200 µg m−3) occurred at both sites during the studies. In each event, a pattern of transport and accumulation was found. In the first stage, particles were regionally transported from the south or southwest and accumulated under air stagnations, creating the significant secondary formation. Consequently, the boosting of PM2.5 led to severe haze. At both sites, the severe haze occurred due to different patterns of local emission, transport, and secondary processes. At PG, the sulfate-rich residential coal burning particles were dominant. The regional transport between PG and PKU was simulated using the WRF-HYSPLIT model, confirming that the transport from PG to PKU was significant, but PKU to PG occurred occasionally. These cases can explain the serious air pollution in the urban areas of Beijing and the interaction between urban and rural areas. This study can provide references for enhancing our understanding of haze formation in Beijing.

Yang Chen et al.

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Short summary
Individual particles were observed in two parallel field studies during 2016 winter in the urban and rural areas of Beijing. Online single-particle chemical composition analysis was used as a tracer system to investigate the impact of heating activities and the formation of haze events. During the pollution events, a pattern of transport and accumulation was found with evidence of single particles. The transport from PG to PKU was significant, but PKU to PG occurred occasionally.
Individual particles were observed in two parallel field studies during 2016 winter in the urban...
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