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Discussion papers
https://doi.org/10.5194/acp-2018-1077
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1077
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Nov 2018

Research article | 05 Nov 2018

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

Two-way feedback mechanism between unfavorable meteorological conditions and cumulative aerosol pollution exists in various haze regions of China

Junting Zhong1, Xiaoye Zhang1,2, Yaqiang Wang1, Jizhi Wang1, Xiaojing Shen1, Hongsheng Zhang3, Tijian Wang4, Zhouqing Xie2,5,6, Cheng Liu2,5,6, Hengde Zhang7, Tianliang Zhao8, Junying Sun1, Shaojia Fan9, Zhiqiu Gao8, Yubin Li8, and Linlin Wang10 Junting Zhong et al.
  • 1Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China
  • 2Center for Excellence in Regional Atmospheric Environment, IUE, Chinese Academy of Sciences, Xiamen, 361021, China
  • 3Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100081, China
  • 4School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China
  • 5Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China
  • 6School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 7National Meteorological Center, China Meteorological Administration, Beijing, 100081, China
  • 8Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 9Sun Yat-sen University, Guangzhou, 510275, China
  • 10State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Abstract. Accompanied by unfavorable meteorological conditions with stable stratification in various haze regions of China, persistent heavy aerosol pollution episodes lasting more than 3 consecutive days (HPEs) frequently occur, particularly in winter. In the North China Plain (NCP), explosive growth in PM2.5, which occurs in some HPES, is dominated by a two-way feedback mechanism between further worsened unfavorable meteorological conditions and cumulative aerosol pollution. However, whether such a two-way feedback mechanism exists in other key haze regions is uncertain; these regions include the Guanzhong Plain (GZP), the Yangtze River Delta (YRD) region, the Two Lakes Basin (TLB), the Pearl River Delta (PRD) region, the Sichuan Basin (SB), and the Northeast China Plain (NeCP). In this study, using surface PM2.5 and radiation observations, radiosonde observations, and reanalysis data, we observed the existence of a two-way feedback mechanism in the above six regions. In the SB, this two-way feedback mechanism is weak due to the suppression of cloudy mid-upper layers. In the more polluted NCP, the FWRP, and the NeCP, the feedback is more striking than that in the YRD, the TLB, and the PRD. In these regions, the feedback of worsened meteorological conditions on PM2.5 explains 60–70% of the increase in PM2.5 during the cumulative stages (CSs). For each region, the low-level cooling bias becomes increasingly substantial with aggravating aerosol pollution and a closer distance to the ground surface. With PM2.5 mass concentrations greater than 400μgm−3, the near-ground bias exceeded −4ºC in Beijing and reached up to approximately −4ºC in Xi’an; this result was caused by accumulated aerosol mass to some extent. In addition to the increase in PM2.5 caused by the two-way feedback, these regions also suffer from the regional transport of pollutants, including inter-regional transport in the FWRP, trans-regional transport from the NCP to the YRD and the TLB, and southwesterly transport in the NeCP.

Junting Zhong et al.
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Short summary
In various haze regions of China, including the Guanzhong Plain, the middle and lower reaches of the Yangtze River, the Pearl River Delta, the Sichuan Basin, and the Northeast China Plain, heavy aerosol pollution episodes include inter/trans-regional transport stages and cumulative stages (CSs). During CSs exists the two-way feedback mechanism between unfavorable meteorological conditions and cumulative aerosol pollution. The two-way feedback is further quantified and its magnitude is compared.
In various haze regions of China, including the Guanzhong Plain, the middle and lower reaches of...
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