Impact of Stratospheric Intrusions on Ozone Enhancement in the Lower Troposphere and Implication to Air Quality in Hong Kong and Other South China Regions

Zhao, Kaihui1; Huang, Jianping2,3,4; Wu, Yonghua5,6; Yuan, Zibing1; Wang, Yongwei7; Li, Ying8; Ma, Xiaodan2; Liu, Xuehui1; Ma, Wei1; Wang, Ying9; Zhang, Xiaoyan2

2021-09-27

10.1029/2020JD033955

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   影响因子和分区

2169-897X

2169-8996

Stratospheric intrusions are an important source of ozone (O-3) in the troposphere. In this study, 17 years of O-3 sounding data from the Hong Kong Observatory with a weekly sampling frequency are analyzed to identify stratospheric intrusions and quantify their impact on O-3 enhancement events in springtime from 2004 to 2020. 24.7% of O-3 enhancement events are related to stratospheric intrusion whereas 31.7% of intrusions lead to the enhancement of O-3 in the lower troposphere. Occurrences of stratospheric intrusion in springtime are closely related to tropopause folding and tropospheric convective activities in subtropical regions. The Weather Research and Forecasting model coupled with Chemistry simulations are conducted with the integrated process analysis to quantify the impact of stratospheric intrusions on the enhancement of O-3 in the lower free troposphere as well as near the surface under different synoptic patterns. Synoptic patterns associated with stratospheric intrusion-driving O-3 enhancements are classified into two categories: Saddle Point ("S") and Cold Front ("F"). While downward transport of O-3-enriched air from the enhancement layer exerts an important impact on surface O-3 for synoptic pattern "S," the impact on surface O-3 is limited for surface pattern "F." The impact of stratospheric intrusions together with entrainment on surface O-3 may have a strong indication on the development of effective emission control strategies on surface O-3 reduction in Hong Kong.

stratospheric intrusion subtropical jet stream ozone WRF Chem Hong Kong

SCI

英语

其他

National Natural Science Foundation of China[42105164,41575009,91644221] ; China Postdoctoral Science Foundation[2020M682713] ; Research Fund Program of Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality[GHML2021-501] ; Xianyang major science and technology projects[2017K01-35]

Meteorology & Atmospheric Sciences

Meteorology & Atmospheric Sciences

WOS:000702399300009

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.South China Univ Technol, Sch Environm & Energy, Guangzhou, Peoples R China
2.Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing, Peoples R China
3.NOAA, IM Syst Grp, Environm Modeling Ctr, Natl Ctr Environm Predict, College Pk, MD 20740 USA
4.George Mason Univ, Coll Sci, Ctr Spatial Informat Sci & Syst, Fairfax, VA 22030 USA
5.CUNY City Coll, New York, NY USA
6.NOAA, CREST, New York, NY USA
7.Nanjing Univ Informat Sci & Technol, Climate Environm & Sustainabil Ctr, Nanjing, Peoples R China
8.Southern Univ Sci & Technol, Shenzhen, Peoples R China
9.Xianyang Meteorol Bur, Xianyang, Peoples R China

Zhao, Kaihui,Huang, Jianping,Wu, Yonghua,et al. Impact of Stratospheric Intrusions on Ozone Enhancement in the Lower Troposphere and Implication to Air Quality in Hong Kong and Other South China Regions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2021,126(18).

Zhao, Kaihui.,Huang, Jianping.,Wu, Yonghua.,Yuan, Zibing.,Wang, Yongwei.,...&Zhang, Xiaoyan.(2021).Impact of Stratospheric Intrusions on Ozone Enhancement in the Lower Troposphere and Implication to Air Quality in Hong Kong and Other South China Regions.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,126(18).

Zhao, Kaihui,et al."Impact of Stratospheric Intrusions on Ozone Enhancement in the Lower Troposphere and Implication to Air Quality in Hong Kong and Other South China Regions".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 126.18(2021).