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DOI	10.5194/acp-22-8221-2022
	Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection
	Chen, Zhixiong; Liu, Jane; Qie, Xiushu; Cheng, Xugeng; Shen, Yukun; Yang, Mengmiao; Jiang, Rubin; Liu, Xiangke
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8221
结束页码	8240
卷号	22 期号:12 页码:20
英文摘要	Stratospheric ozone transported to the troposphere is estimated to account for 5 %-15% of the tropo-spherico zone sources. However, the chances of intruded stratospheric ozone reaching the surface are low. Here,we report an event of a strong surface ozone surge of stratospheric origin in the North China Plain (NCP, 34-40 degrees N, 114-121 degrees E) during the night of 31 July 2021. The hourly measurements reveal surface ozone concentrations of up to 80-90 ppbv at several cities over the NCP from 23:00 LST (Local Standard time, D UTC C8 h) on31 July to 06:00 LST on 1 August 2021. The ozone enhancement was 40-50 ppbv higher than the corresponding monthly mean. A high-frequency surface measurement indicates that this ozone surge occurred abruptly, with an increase reaching 40-50 ppbv within 10 min. A concurrent decline in surface carbon monoxide (CO) concentrations suggests that this surface ozone surge might have resulted from the downward transport of a stratospheric ozone-rich and CO-poor air mass. This is further confirmed by the vertical evolutions of humidity and ozone profiles based on radiosonde and satellite data respectively. Such an event of stratospheric impact on surface ozone is rarely documented in view of its magnitude, coverage, and duration. We find that this surface ozone surge was induced by a combined effect of dying Typhoon In-fa and shallow local mesoscale convective systems (MCSs) that facilitated transport of stratospheric ozone to the surface. This finding is based on analysis of meteorological reanalysis and radiosonde data, combined with high-resolution Weather Research and Forecasting (WRF) simulation and backward trajectory analysis using the FLEXible ARTicle (FLEXPART) particle dispersion model. Although Typhoon In-fa on the synoptic scale was at its dissipation stage when it passed through the NCP, it could still bring down a stratospheric dry and ozone-rich air mass. As a result, the stratospheric air mass descended to the middle-to-low troposphere over the NCP before the MCSs formed. With the pre-existing stratospheric air mass, the convective downdrafts of the MCSs facilitated the final descent of stratospheric air mass to the surface. Significant surface ozone enhancement occurred in the convective downdraft regions during the development and propagation of the MCSs. This study underscores the substantial roles of weak convection in transporting stratospheric ozone to the lower troposphere and even to the surface, which has important implications for air quality and climate change.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000815139400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273525
作者单位	Fujian Normal University; University of Toronto; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Chen, Zhixiong,Liu, Jane,Qie, Xiushu,et al. Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection[J],2022,22(12):20.
APA	Chen, Zhixiong.,Liu, Jane.,Qie, Xiushu.,Cheng, Xugeng.,Shen, Yukun.,...&Liu, Xiangke.(2022).Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),20.
MLA	Chen, Zhixiong,et al."Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):20.