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

doi:10.5194/acp-2020-554

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-554
	Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts
	Chenchao Zhan, Min Xie, Chongwu Huang, Tijian Wang, Jane Liu, Meng Xu, Chaoqun Ma, Jianwei Yu, Yumeng Jiao, Mengmeng Li, Shu Li, Bingliang Zhuang, Ming Zhao, and Dongyang Nie
	2020-07-21
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	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.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/286736
专题	地球科学
推荐引用方式 GB/T 7714	Chenchao Zhan, Min Xie, Chongwu Huang, Tijian Wang, Jane Liu, Meng Xu, Chaoqun Ma, Jianwei Yu, Yumeng Jiao, Mengmeng Li, Shu Li, Bingliang Zhuang, Ming Zhao, and Dongyang Nie. Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts[J]. Atmospheric Chemistry and Physics,2020.
APA	Chenchao Zhan, Min Xie, Chongwu Huang, Tijian Wang, Jane Liu, Meng Xu, Chaoqun Ma, Jianwei Yu, Yumeng Jiao, Mengmeng Li, Shu Li, Bingliang Zhuang, Ming Zhao, and Dongyang Nie.(2020).Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts.Atmospheric Chemistry and Physics.
MLA	Chenchao Zhan, Min Xie, Chongwu Huang, Tijian Wang, Jane Liu, Meng Xu, Chaoqun Ma, Jianwei Yu, Yumeng Jiao, Mengmeng Li, Shu Li, Bingliang Zhuang, Ming Zhao, and Dongyang Nie."Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts".Atmospheric Chemistry and Physics (2020).