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Preprints
https://doi.org/10.5194/acp-2020-1161
https://doi.org/10.5194/acp-2020-1161

  23 Nov 2020

23 Nov 2020

Review status: this preprint is currently under review for the journal ACP.

Elevated 3D structures of PM2.5 and impact of complex terrain-forcing circulations on heavy haze pollution over Sichuan Basin, China

Zhuozhi Shu1,4, Yubao Liu1,4, Tianliang Zhao1,4, Junrong Xia1, Chenggang Wang1, Le Cao1, Haoliang Wang1, Lei Zhang2, Yu Zheng2, Lijuan Shen1, Lei Luo3, and Yueqing Li3 Zhuozhi Shu et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 2State Key Laboratory of Disastrous Weather, China Academy of Meteorological Sciences, Beijing, 100081, China
  • 3Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, 610072, China
  • 4Precision Regional Earth Modeling and Information Center, Nanjing University of Information Science and Technology, Nanjing, 210044, China

Abstract. Deep basins create a uniquely favorable condition for the formation of air pollution, and the Sichuan Basin (SCB) in Southwest China is such a basin featuring frequent heavy pollution. A wintertime heavy haze pollution event in SCB was studied with conventional and intensive observation data and the WRF-chem model to explore the three-dimensional distribution of PM2.5 for understanding the impact of regional pollutant emissions, basin circulations associated with plateaus, and downwind transport to the adjacent areas. It was found that the vertical structure of PM2.5 over SCB was characterized with a remarkable hollow sandwiched by high PM2.5 layers at heights of 1.5–3 km and the highly polluted near-surface layer. The southwesterlies passed over the Tibetan Plateau (TP) and Yunan-Guizhou Plateau (YGP) resulted in a lee vortex over SCB, which helped form and maintain heavy PM2.5 pollution. The basin PM2.5 was lifted into the free troposphere and transported outside of SCB. At the bottom of SCB, high PM2.5 concentrations were mostly located in the northwest and southern regions. Due to the blocking effect of the plateau terrain on the northeasterly winds, PM2.5 gradually increased from northeast to southwest in the basin. In the lower free troposphere, the high PM2.5 centers were distributed over the northwestern and southwestern SCB areas, as well as the central SCB region. For this event, the regional emissions from SCB contributed 75.4–94.6 % to the surface PM2.5 concentrations in SCB. The SCB emission export was the major source of the PM2.5 over the eastern regions of TP and the northern regions of YGP, with contribution rates of 72.7 % and 70.5 %, respectively, during the dissipation stage of heavy air pollution over SCB, which was regarded as the major pollutant sources affecting atmospheric environment changes in Southwest China.

Zhuozhi Shu et al.

 
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Zhuozhi Shu et al.

Zhuozhi Shu et al.

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