Preprints
https://doi.org/10.5194/acp-2021-618
https://doi.org/10.5194/acp-2021-618

  25 Oct 2021

25 Oct 2021

Review status: this preprint is currently under review for the journal ACP.

The impact of peripheral circulation characteristics of typhoon on sustained ozone episodes over the Pearl River Delta region, China

Ying Li1,2, Xiangjun Zhao1,2,3, Xuejiao Deng4, and Jinhui Gao1,2,5 Ying Li et al.
  • 1Department of Ocean Sciences and Engineering, Southern University of Science and Technology, Shenzhen, China
  • 2Southern University of Science and Technology, Shenzhen, China
  • 3School of Mathematics and Finance, Chuzhou University, Anhui 239000,China
  • 4Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China
  • 5Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China

Abstract. It is widely reported that the peripheral circulation of typhoon favors for the formation of sustained ozone episodes. However, the process how it impact on the day-to-day ozone pollution levels during the episodes have not been clearly studies, which is crucial for better prediction of the daily ozone variation. In this study, the analysis of ground observation, wind profile data, and model simulation are integrated. By analyzing the wind profile radar observations, we found a weak winds depth deepening (WWDD; vertical depth of the weak winds increased), which is more correlated to the ground-level ozone variation than surface weak wind. Long-term statistical analyses show that the WWDD is a common weather phenomenon that occurs in the peripheral subsidence region of typhoons and was generally accompanied by ozone pollution episodes. WRF-Chem with process analysis simulation show that under the impact of the peripheral subsidence chemical formation (CHEM) and vertical mixing (VMIX) effects are two major contributors to the enhancement of ozone levels, while the advection (ADV) are always negative values. But regarding the daily variability of the daytime ozone levels during the episode, it do not determined by the daily variation of daytime CHEM and VMIX, but that of the ADV term. A detail day-to-day analysis show that weak subsidence associated with typhoon periphery provide the premise for the clear sky and warmer air, which is conducive for the ozone photolysis formation (CHEM) above the ground in planetary boundary layer (PBL) and compensate the ozone through the positive VMIX effects on the ground. The WWDD induced by the peripheral circulation of typhoon system provide the premise for the day-to-day positive contribution of ADV term to ozone enhancement, which play an important role in determining the day-to-day daytime ozone variation. These results indicate the important role of the WWDD in the lower troposphere for the formation of sustained ozone episodes due to the peripheral circulation of the typhoon, which helps to better predict the daily changes of daytime ozone levels.

Ying Li et al.

Status: open (until 06 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-618', Anonymous Referee #2, 24 Nov 2021 reply

Ying Li et al.

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Short summary
This study finds a new phenomenon of weak wind depth deepening (WWDD) associated with the peripheral circulation of typhoon and gives the influence mechanism of WWDD on contributing to sustained ozone episodes. The WWD provide the premise for the pollution accumulation in the whole PBL and continue enhancement of ground-level ozone via the vertical mixing processes. This findings could benefit for the daily daytime ozone forecast in the PRD region and other areas.
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