Typhoon Subsidence Intensity Flips Surface Ozone Spikes From Photochemical Production to Vertical Transport

Abstract Peripheral subsidence of Northwest Pacific typhoons can trigger extreme surface ozone episodes, yet the relative contributions of local chemistry and vertical transport remain poorly constrained. Here we measured 30‐min aerodynamic gradient fluxes of NO x , O 3 , and CO at 118 and 168 m on Canton Tower (Pearl River Delta) during 2 September typhoons in 2021 and 2022. Surface O 3 climbed by >50% in both events. In September 2021, moderate subsidence created hot, stagnant conditions that accelerated local photochemical ozone production, yielding upward O 3 flux. In September 2022, stronger, long‐lived subsidence instead injected ozone‐rich air from aloft, causing downward O 3 flux despite favorable chemistry. This flux evidence demonstrates that subsidence intensity toggles the balance between local production and vertical transport of ozone, informing forecasts of coastal extreme‐ozone risk.

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Publication Details

Journal
Journal of Geophysical Research Atmospheres
Published
2026-02-02
DOI
https://doi.org/10.1029/2025jd044948
Primary Topic
Tropical and Extratropical Cyclones Research
Type
article
Field-Weighted Citation Impact
0.00

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article

Typhoon Subsidence Intensity Flips Surface Ozone Spikes From Photochemical Production to Vertical Transport

Jianqiang Zeng, Xinyu Tian, Le Fang, David Tang et al.
Journal of Geophysical Research Atmospheres
Tropical and Extratropical Cyclones Research
article

Typhoon Subsidence Intensity Flips Surface Ozone Spikes From Photochemical Production to Vertical Transport

Jianqiang Zeng, Xinyu Tian, Le Fang, David Tang, Huijie Lu, Yanli Zhang, Lei Geng, Chenglei Pei, Wei Song, Xinming Wang, Jinpu Zhang
article en

Abstract

Abstract Peripheral subsidence of Northwest Pacific typhoons can trigger extreme surface ozone episodes, yet the relative contributions of local chemistry and vertical transport remain poorly constrained. Here we measured 30‐min aerodynamic gradient fluxes of NO x , O 3 , and CO at 118 and 168 m on Canton Tower (Pearl River Delta) during 2 September typhoons in 2021 and 2022. Surface O 3 climbed by >50% in both events. In September 2021, moderate subsidence created hot, stagnant conditions that accelerated local photochemical ozone production, yielding upward O 3 flux. In September 2022, stronger, long‐lived subsidence instead injected ozone‐rich air from aloft, causing downward O 3 flux despite favorable chemistry. This flux evidence demonstrates that subsidence intensity toggles the balance between local production and vertical transport of ozone, informing forecasts of coastal extreme‐ozone risk.

Journal of Geophysical Research AtmospheresVol. 131(3)
University of Science and Technology of China (CN), Chinese Academy of Sciences (CN), Guangzhou Institute of Geochemistry (CN), Guangdong Province Environmental Monitoring Center (CN), SpaceX (United States) (US), University of Chinese Academy of Sciences (CN)
National Natural Science Foundation of China, Guangzhou Municipal Science and Technology Bureau, National Key Research and Development Program of China
Life below water
Openalex Percentile: Top 78%
Tropical and Extratropical Cyclones Research
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