【摘要】 复合高温干旱事件对区域自然生态环境和社会经济发展带来严重威胁。以长江流域为研究对象，基于CN05.1日最高气温数据以及ERA5和GLDAS-Noah数据集的表层土壤含水量数据，在日尺度上识别长江流域复合高温干旱事件，提取复合事件频次及强度特征，分析其时空演变规律。研究结果表明：1961—2022年长江流域复合高温干旱事件的频次和强度在时间上均呈现显著上升趋势(p<0.05)。在空间上，频次呈现自东南向西北递减的分布特征，强度则呈现相反的空间分布特征。此外，与基准期1961—1991年相比，1992—2022年长江流域大部分地区的复合高温干旱事件频次及强度均显著增加。更多还原

【Abstract】 The compound hot-dry events often pose a serious threat to the regional natural ecological environment and socio-economic development. This study focuses on the Yangtze River Basin, identifying compound hot-dry on a daily scale based on the CN05.1 daily maximum temperature data and the surface soil moisture data from the ERA5 and GLDAS-Noah datasets. And extracts the frequency and intensity of compound events and analyzes their Spatio-temporal evolution patterns. The results indicate that from 1961 to 2022, both the frequency and intensity of compound hot-dry events in the Yangtze River Basin show a significant upward trend over time(p<0.05). Spatially, the frequency exhibits a decreasing distribution from southeast to northwest, while the intensity shows the opposite spatial distribution pattern. Furthermore, compared to the baseline period of 1961—1991, the frequency and intensity of compound hot-dry events significantly increased from 1992 to 2022 in most areas of the Yangtze River Basin.更多还原