Preprints
https://doi.org/10.5194/egusphere-2024-846
https://doi.org/10.5194/egusphere-2024-846
04 Jun 2024
 | 04 Jun 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Impacts of tropical cyclone-heatwave compound events on surface ozone in eastern China: Comparison between the Yangtze River and Pearl River Deltas

Cuini Qi, Pinya Wang, Yang Yang, Huimin Li, Hui Zhang, Lili Ren, Xipeng Jin, Chenchao Zhan, Jianping Tang, and Hong Liao

Abstract. China has implemented some air pollution management measures in recent years, yet severe ozone pollution remains a significant issue. The Southeastern Coast of China (SECC) is often influenced by hot extremes and tropical cyclones (TCs), and the two can occur simultaneously (TC-HDs). The compound TC-HDs show a rising trend in the summers of 2014–2019, potentially affecting ozone pollution. Here, we found that surface ozone concentrations over SECC are elevated during extreme hot days than the climatology. However, compared to extreme hot days alone (AHDs), the maximum 8-hour average ozone (MDA8 O3) concentration increases by an average of 6.8 μg/m3 in the Pearl River Delta (PRD) and decreases by 13.2 μg/m3 in the Yangtze River Delta (YRD) during the compound TC-HDs. The meteorological conditions during AHDs favor the chemical production of ozone over SECC, exhibiting increased temperature and solar radiation but decreased relative humidity. Relative to AHDs, strong northeasterly winds prevail in SECC during TC-HDs, suggesting the potential of ozone cross-regional transport between YRD and PRD. The process analysis in the chemical transport model (GEOS-Chem) suggests that relative to AHDs, the chemical production of ozone is enhanced in YRD during TC-HDs while horizontal transport alleviates ozone pollution in YRD but worsens it in PRD through cross-regional transport. The results highlight the significant effects of cross-regional transport in modulating ozone pollution in the two megacity clusters during hot extremes accompanied by TC activities, giving insight into future ozone control measures over SECC under global warming.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Cuini Qi, Pinya Wang, Yang Yang, Huimin Li, Hui Zhang, Lili Ren, Xipeng Jin, Chenchao Zhan, Jianping Tang, and Hong Liao

Status: open (until 16 Jul 2024)

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Cuini Qi, Pinya Wang, Yang Yang, Huimin Li, Hui Zhang, Lili Ren, Xipeng Jin, Chenchao Zhan, Jianping Tang, and Hong Liao
Cuini Qi, Pinya Wang, Yang Yang, Huimin Li, Hui Zhang, Lili Ren, Xipeng Jin, Chenchao Zhan, Jianping Tang, and Hong Liao

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Short summary
We investigate extreme hot weathers impacts on surface ozone over Southeastern Coast of China with (TC-HDs) and without (AHDs) tropical cyclones. Compared to AHDs, ozone concentration decreased notably in Yangtze River Delta (YRD) but increased in Pearl River Delta (PRD) during TC-HDs. YRD benefitted from strong, clean sea winds aiding ozone elimination. In contrast, PRD experienced strong northeasterly winds, potentially transporting ozone pollution.