Elevated surface ozone concentration caused by subtropical cyclones and topographical effect: Model simulation and field measurement,Urban Climate

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Elevated surface ozone concentration caused by subtropical cyclones and topographical effect: Model simulation and field measurement
Urban Climate ( IF 6.0 ) Pub Date : 2024-08-18 , DOI: 10.1016/j.uclim.2024.102093
Kuo-Cheng Lo , Wen-Hsi Cheng , Chitsan Lin , Chung-Hsuang Hung , Chung-Shin Yuan , Yu-Lun Tseng

This study pioneered the forecasting of typhoon trajectories and conducted the comprehensive analysis of pre-typhoon surface O3 patterns using WRF-Chem model integrated with a novel Four-Dimensional Variation Data Assimilation (4DVAR). The WRF-Chem model was employed to analyze the impact of typhoon tracks on surface O3 concentrations in southern Taiwan in 2013 and 2023. The simulations examined the variation of surface O3 concentrations; while both surface monitoring and sounding data were integrated into the model. The study evaluated the spatiotemporal variation of typhoon tracks, and correlated them with suface O3 concentrations. Elevated surface O3 levels preceding typhoon arrival were significantly influenced by the typhoon tracks. Meanwhile, a surge observed approximately 1–2 days prior to sea warnings was associated with the weakened West Pacific Subtropical High (WPSH) and intensified leeward effects. Atmospheric subsidence in both scenarios contributed to declining air quality. Typhoon invasions raised surface O3 concentrations 1–3 times higher than normal in summer and fall. Model simulation results indicated that spatial O3 patterns preceding typhoon arrival could forecast the typhoon tracks 1–2 days in advance, providing insights into mechanisms behind pre-typhoon elevated O3 levels. The findings offer valuable references for forecasting surface O3 concentrations based on typhoon tracks.

更新日期：2024-08-18

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