Mechanisms of high-temperature ozone suppression in Eastern China: a meteorological perspective

作者：Nan Li, Jianping Liang, Wanwan Liu, C. Gu, Jiandong Li, Xu Yang, Keqin Tang, Hong Liao, Jianlin Hu · 发表于：Environmental Research Letters · 年份：2025 · DOI：10.1088/1748-9326/adf1ba · 被引用次数：10 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Atmospheric Ozone and Climate

Abstract Ozone (O 3 ) is a typical secondary photochemical pollutant, whose production typically increases under high temperature and radiation. However, emerging observational evidences reveal a notable alteration in the O 3 -temperature relationship under extremely heat conditions (referred to as O 3 suppression) in 20%–30% cities of China, yet the underlying mechanisms and driving forces remain unclear. This study provides a comprehensive investigation of the meteorological mechanisms driving high-temperature O 3 suppression in Eastern China, with particular emphasis on regional disparities between suppression and non-suppression areas. Our analysis revealed distinct spatial patterns of O 3 suppression across major Chinese regions. The Yangtze River Delta (YRD) and Pearl River Delta (PRD) regions exhibit significant O 3 suppression, with the O 3 -temperature relationship decreasing by 3–5 μ g m −3 °C −1 at high temperatures. In contrast, the Beijing–Tianjin–Hebei (BTH) region rarely illustrates this phenomenon. Through integrated statistical analysis and machine learning approaches, we identified radiation, relative humidity (RH), and planetary boundary layer height (PBLH) as the key meteorological drivers. Mechanistic analysis demonstrated that RH was the dominant factor accounting for regional differences in O 3 suppression, primarily owing to the contrasting effects of dry heat (BTH) and wet heat (YRD and PRD). PBLH emerged as a secondary influential factor that modulat...