Compound events have become more frequent and diverse under global warming. This study specifically focuses on a type of compound events termed spatially compounding flood-nocturnal heat events over adjacent regions. Five flood hotspots are identified to compound with adjacent nocturnal heat. The flood and nocturnal heat are linked via a water vapor transport belt, with flood over the region of prominent water vapor convergence and ascending anomalies and nocturnal heat over the extension region with moderately increased humidity and weak vertical motion anomaly. The compound events for all the hotspots occur more frequently recently, with commonly positive contribution from the increasing trends of nocturnal temperature (T_N) but various contribution from the trends of precipitation (Pr) and Pr-T_N correlation. The positive contribution of enhanced Pr-T_N correlation results from the enhanced variability of the circulation accompanied with water vapor transport. This study highlights the influence of atmospheric circulation variability on compound events.

在全球变暖的背景下，复合事件变得更加频繁和多样化。这项研究特别关注一种被称为邻近地区空间复合洪水-夜间高温事件的复合事件。已确定五个洪水热点与邻近的夜间高温混合。洪水和夜热通过水汽输送带联系在一起，水汽辐合和上升异常显着的区域发生洪水，而湿度适度增高、垂直运动异常弱的延伸区域发生夜热。所有热点的复合事件最近发生得更加频繁，通常由夜间温度（T _N ）的上升趋势产生正向贡献，但降水量（Pr）趋势和Pr-T _N相关性的不同贡献。 Pr-T _N相关性增强的积极贡献是由于水汽输送引起的环流变化性增强所致。这项研究强调了大气环流变化对复合事件的影响。