Preprints
https://doi.org/10.5194/egusphere-2024-268
https://doi.org/10.5194/egusphere-2024-268
28 Feb 2024
 | 28 Feb 2024

A significant mechanism of stratospheric O3 intrusion to atmospheric environment: a case study of North China Plain

Yuehan Luo, Tianliang Zhao, Kai Meng, Jun Hu, Qingjian Yang, Yongqing Bai, Kai Yang, Weikang Fu, Chenghao Tan, Yifan Zhang, Yanzhe Zhang, and Zhikuan Li

Abstract. Stratosphere-to-troposphere transport results in the stratospheric intrusion (SI) of O3 into the free troposphere through the tropopause folding. However, the mechanism of SI influencing the atmospheric environment with the cross-layer transport of O3 from the stratosphere, free troposphere to the atmospheric boundary layer has not been elucidated thoroughly. In this study, a SI event over the North China Plain (NCP) was taken to investigate the mechanism of the cross-layer transport of stratospheric O3 with the impact on the near-surface O3 based on the multi-source reanalysis and observation data and air quality modeling. The results revealed a significant mechanism of stratospheric O3 intrusion to the atmospheric environment induced by an extratropical cyclone system. The SI with downward transport of stratospheric O3 to near-surface layer was driven by the extratropical cyclone system with vertical coupling of "upper westerly trough-middle the Northeast Cold Vortex (NECV)-lower extratropical cyclone" in the troposphere. The deep trough in the westerly jet aroused the tropopause folding, and the lower stratospheric O3 penetrated the folded tropopause into the upper and middle troposphere; the westerly trough was cut off to form a typical cold vortex in the upper and middle troposphere. The compensating downdrafts of the NECV pushed the further downward transport of stratospheric O3 in the free troposphere; The NECV activated an extratropical cyclone in the lower troposphere, and the vertical cyclonic circulation governed the stratospheric O3 from the free troposphere across the boundary layer top invading the near-surface atmosphere. In this SI event, the averaged contribution of stratospheric O3 to near-surface O3 was accounted for 26.77 %. The proposed meteorological mechanism of vertical transport of stratospheric O3 into the near-surface atmosphere driven by an extratropical cyclone system could improve the understanding of the influence of stratospheric O3 on atmospheric environment with implications for the coordinated control of atmospheric pollution.

Yuehan Luo, Tianliang Zhao, Kai Meng, Jun Hu, Qingjian Yang, Yongqing Bai, Kai Yang, Weikang Fu, Chenghao Tan, Yifan Zhang, Yanzhe Zhang, and Zhikuan Li

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-268', Anonymous Referee #2, 18 Mar 2024
  • RC2: 'Comment on egusphere-2024-268', Anonymous Referee #1, 03 Apr 2024
    • AC1: 'Reply on RC2', Tianliang Zhao, 10 Apr 2024
Yuehan Luo, Tianliang Zhao, Kai Meng, Jun Hu, Qingjian Yang, Yongqing Bai, Kai Yang, Weikang Fu, Chenghao Tan, Yifan Zhang, Yanzhe Zhang, and Zhikuan Li
Yuehan Luo, Tianliang Zhao, Kai Meng, Jun Hu, Qingjian Yang, Yongqing Bai, Kai Yang, Weikang Fu, Chenghao Tan, Yifan Zhang, Yanzhe Zhang, and Zhikuan Li

Viewed

Total article views: 339 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
279 46 14 339 24 5 6
  • HTML: 279
  • PDF: 46
  • XML: 14
  • Total: 339
  • Supplement: 24
  • BibTeX: 5
  • EndNote: 6
Views and downloads (calculated since 28 Feb 2024)
Cumulative views and downloads (calculated since 28 Feb 2024)

Viewed (geographical distribution)

Total article views: 356 (including HTML, PDF, and XML) Thereof 356 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 19 Apr 2024
Download
Short summary
This study revealed a significant mechanism of stratospheric O3 intrusion to atmospheric environment induced by an extratropical cyclone system. The SI with downward transport of stratospheric O3 to near-surface layer was driven by the extratropical cyclone system with vertical coupling of "upper westerly trough-middle NECV-lower extratropical cyclone" in the troposphere. In the SI event, the averaged contribution of stratospheric O3 to near-surface O3 was accounted for 26.77 % over the NCP.