Based on multi-source environmental and meteorological datasets, this study quantifies the spatiotemporal characteristics of the heat index and surface ozone concentrations during the summers of 2022–2024 across the Beijing-Tianjin-Hebei (BTH) region and its surroundings. Results show that compound heat-O3 events frequently occur over the piedmont plains of southern Hebei. Using a self-organizing map (SOM) method to classify 850 hPa synoptic patterns, two typical circulation types are identified as being strongly associated with these compound events. These patterns induce warm advection near the top of the planetary boundary layer and suppress vertical mixing, while simultaneously directing warm and humid air from the south to accumulate within the semi-enclosed topography of the BTH region. This leads to enhanced heat risk and pollution levels. The study reveals key planetary boundary layer processes governed by the joint modulation of regional atmospheric circulation and terrain, offering valuable insights for improving early warning and risk mitigation of compound meteorological hazards.

基于多源环境气象资料, 量化2022—2024年夏季京津冀及其周边地区的热指数以及地面臭氧浓度的时空特征, 发现高温与臭氧污染的复合事件频繁发生于河北南部山前平原。采用自组织映射方法, 对850 hPa天气形势场进行环流分型, 识别出两类典型环流形势与复合事件的高发显著相关。这些环流会在边界层顶部引发暖平流并抑制垂直混合, 同时引导南部暖湿气流在京津冀地区的半包围地形中积聚, 造成高热风险与污染的共同增强。研究结果揭示了区域大气环流与地形协同调控下高温与污染复合过程的边界层物理机制, 对加强复合气象灾害的预警与风险防控具有重要参考价值。