With global warming and frequent occurrence of extreme hot events, the accompanying heat stress, which is believed to be the combined effects of temperature and humidity on human health, is also expected to increase. The temperature and precipitation both increased recently, which indicates a high incidence of extreme compound hot and humid events (CHHEs) in South China, while its trend and mechanism still need further research. Through the comparison of three types of extreme events (extreme hot events (HOEs), extreme humid events (HUEs), and extreme compound hot and humid events (CHHEs)), this study revealed the spatiotemporal characteristics, driving factors, and temperature-humidity relationships of CHHEs in South China. What’s more, the temperature-humidity relationships of CHHEs with different dominant types and intensities were further explored. The research results are as follows: (1) HOEs and CHHEs significantly increased, while HUEs decreased, which is consistent with the trend of temperature and relative humidity. (2) The driving factors of HOEs were opposite to those of HUEs, and strong net thermal radiation, evaporation, and water vapor transport were favorable meteorological conditions for CHHEs in South China. (3) Most of CHHEs in South China were temperature dominant type, which covered longer duration and higher intensity than humidity dominant and non-dominant types. (4) There was a strong linear relationship between temperature and humidity during CHHEs. And for the same temperature range, the higher the intensity of CHHEs was, the lower the humidity difference would be.

随着全球变暖和极端炎热事件的频繁发生，随之而来的热应激（被认为是温度和湿度对人类健康的综合影响）预计也会增加。近期气温和降水量均有所增加，表明华南地区极端复合湿热事件（CHHE）高发，但其趋势和机制仍需进一步研究。通过对极端炎热事件（HOEs）、极端潮湿事件（HUEs）和极端复合湿热事件（CHHEs）三类极端事件的比较，揭示了极端事件的时空特征、驱动因素和温湿度变化。华南地区 CHHE 的关系。此外，还进一步探讨了不同主导类型和强度的CHHE的温湿度关系。研究结果如下：（1）HOEs和CHHEs显着增加，而HUEs减少，这与温度和相对湿度的变化趋势一致。 (2)HOEs的驱动因素与HUEs相反,强的净热辐射、蒸发和水汽输送是华南地区CHHEs的有利气象条件。 (3)华南地区CHHE大多为温度主导型，其持续时间较长，强度高于湿度主导型和非主导型。 (4) CHHE期间的温度和湿度之间存在很强的线性关系。并且在相同的温度范围内，CHHE的强度越高，湿度差异越小。