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Atmospheric Chemistry and Physics Volume 20 ,Issue 15 ,2020-08-05
Simultaneous measurements of urban and rural particles in Beijing – Part 2: Case studies of haze events and regional transport
Yang Chen 1 Guangming Shi 1 , 2 Jing Cai 3 Zongbo Shi 4 Zhichao Wang 1 Xiaojiang Yao 1 Mi Tian 1 Chao Peng 1 Yiqun Han 3 Tong Zhu 3 Yue Liu 3 Xi Yang 3 Mei Zheng 3 Fumo Yang 1 , 2 Qiang Zhang 5 Kebin He 6
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DOI:10.5194/acp-20-9249-2020
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摘要

Two parallel field studies were conducted simultaneously at both urban and rural sites in Beijing from 1 to 29 November 2016. An 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 (elemental carbon-nitrate), EC-Nit-Sul (EC-nitrate-sulfate), and ECOC-Nit (ECOC: internal-mixed elemental carbon and organic carbon) 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 of the pattern, particles were regionally transported from the south and southwest and accumulated under air stagnation, creating significant secondary formation, then PM2.5 was elevated to 300 µg m−3. At both sites, the severe haze occurred due to different patterns of local emission, transport, and secondary processes. At Pinggu (PG), the sulfate-rich residential coal burning particles were dominant. The regional transport between PG and Peking University (PKU) was simulated using the Weather Research and Forecasting HYbrid Single-Particle Lagrangian Integrated Trajectory (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.

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Copyright: © 2020 Yang Chen et al.
This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/

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Yang Chen,Guangming Shi,Jing Cai,Zongbo Shi,Zhichao Wang,Xiaojiang Yao,Mi Tian,Chao Peng,Yiqun Han,Tong Zhu,Yue Liu,Xi Yang,Mei Zheng,Fumo Yang,Qiang Zhang,Kebin He. Simultaneous measurements of urban and rural particles in Beijing – Part 2: Case studies of haze events and regional transport. Atmospheric Chemistry and Physics ,Vol.20, Issue 15(2020)

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