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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/acp-2020-554
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-554
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Jul 2020

21 Jul 2020

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This preprint is currently under review for the journal ACP.

Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts

Chenchao Zhan1,, Min Xie1, Chongwu Huang1,, Tijian Wang1, Jane Liu2,3, Meng Xu4, Chaoqun Ma1, Jianwei Yu5, Yumeng Jiao6, Mengmeng Li1, Shu Li1, Bingliang Zhuang1, Ming Zhao1, and Dongyang Nie1 Chenchao Zhan et al.
  • 1School of Atmospheric Sciences, Joint Center for Atmospheric Radar Research of CMA/NJU, CMA-NJU Joint Laboratory for Climate Prediction Studies, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210023, China
  • 2College of Geographic Sciences, Fujian Normal University, 350007, Fuzhou, China
  • 3Department of Geography and Planning, University of Toronto, Toronto, Ontario, Canada
  • 4Jiangsu Provincial Climate Center, Nanjing 210009, China
  • 5Jiangsu Provincial Meteorological Observatory, Nanjing 210008, China
  • 6Department of Microbiology and Parasitology, Bengbu Medical College, Bengbu 233030, China
  • The third author can be considered as the co-first author.

Abstract. Landfall typhoon can significantly affect O3 in the Yangtze River Delta (YRD) region. In this study, we investigate a unique case characterized by two multiday regional O3 pollution episodes related to four successive landfall typhoons in the summer of 2018 in the YRD. The results show that O3 pollution episodes mainly occurred during the period from the end of typhoon and the arrival of the next typhoon. The moment that typhoon reached the 24-h warning line and the last moment of typhoon activity in the mainland China can be roughly regarded as time nodes. Meanwhile, the variations of O3 was related to the track, duration and landing intensity of the typhoons. The impact of typhoon on O3 was like a wave superimposed on the background of high O3 concentration in the YRD in summer. When typhoon was near the 24-h warning line before it landed the coast line of the YRD, the prevailing wind originally from the ocean changed to from the inland, and transported lots of precursors from the polluted areas to the YRD. With typhoon, the low temperature, strong upward airflows, more precipitation and wild wind prevented high O3 episodes. After typhoon, the air below the 700 hPa atmospheric layer was warm and dry, which was conductive to the formation of O3 from the abundance of precursors. It is note-worthy that O3 is mainly generated in the middle of boundary layer (~ 1000 m), and then transported to the surface by downward airflows or turbulences. Moreover, O3 can be accumulated and trapped on the ground due to the poor diffusion conditions because the vertical diffusion and horizontal diffusion were suppressed by downward airflows and light wind, respectively. The premature mortalities attributed to O3 exposure in the YRD during the study period is 194.0, more than the casualties caused directly by the typhoons. This work enhances our understanding of how landfall typhoons affect O3 in the YRD, which can be helpful to forecast the O3 pollution synthetically impacted by the subtropical high and typhoon.

Chenchao Zhan et al.

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Chenchao Zhan et al.

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Short summary
The Yangtze River Delta (YRD) region is suffering from severe ozone (O3) pollution in recent years. Synoptic systems, like typhoon, can have significant effect on O3 episode. However, research on landfall typhoon affecting O3 in the YRD is quite limited. This work aims to reveal the main processes of landfall typhoon affecting surface O3, and estimate health impacts of O3 during the study period in the YRD, which can be useful for making reasonable pollution control measures in this area.
The Yangtze River Delta (YRD) region is suffering from severe ozone (O3) pollution in recent...
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