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https://doi.org/10.5194/acp-2020-646
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-646
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  16 Nov 2020

16 Nov 2020

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This preprint is currently under review for the journal ACP.

Impact of Western Pacific Subtropical High on Ozone Pollution over Eastern China

Zhongjing Jiang1, Jing Li1, Xiao Lu2, Cheng Gong3, Lin Zhang1, and Hong Liao4 Zhongjing Jiang et al.
  • 1Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
  • 2School of Engineering and Applied Sciences, Harvard University, Cambridge, USA
  • 3Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 4Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China

Abstract. Surface ozone is a major pollutant in Eastern China, especially during the summer season. The formation of surface ozone pollution highly depends on meteorological conditions as generally controlled regional circulation patterns. Here we show that summertime ozone pollution over Eastern China is distinctly modulated by the variability of West Pacific Subtropical High (WPSH), a major synoptic system that controls the summertime weather conditions of East Asia. Composite and regression analyses indicate that positive WPSH anomaly is associated with higher than normal surface ozone concentration over Northern China but lower ozone over Southern China. We show that this is mainly driven by changes in meteorological variables with stronger than normal WPSH leading to higher temperatures, stronger solar radiation at the land surface, lower relative humidity, and less precipitation in Northern China, favoring the production and accumulation of surface ozone. In contrast, all variables show reverse changes in Southern China under stronger WPSH. GEOS-Chem simulations reasonably reproduce the observed ozone changes associated with the WPSH and support the statistical analyses. Detailed contributions of different processes are quantified through budget diagnosis, which emphasizes the decisive role of chemistry. Natural emission of precursors from biogenic and soil sources accounts for ~30 % of the total surface ozone changes.

Zhongjing Jiang et al.

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Zhongjing Jiang et al.

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Short summary
This study demonstrates that the intensity of Western Pacific Subtropical High (WPSH), a major synoptic pattern in the North Pacific during the summer season, can induce a dipole change of surface ozone pollution over Eastern China. Ozone concentration increases in the north and decreased in the south during the strong WPSH phase, and vice versa. The change of chemical processes associated with the WPSH change plays a decisive role, whereas natural emission of ozone precursors accounts for ~30 %.
This study demonstrates that the intensity of Western Pacific Subtropical High (WPSH), a major...
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