Spatiotemporal response relationships between different types of droughts in the Yangtze River Basin in 2022

To study the spatiotemporal response of different types of droughts in the Yangtze River Basin in 2022, a three-dimensional spatiotemporal cluster identification method was used to extract meteorological drought, agricultural drought, and hydrological drought events on monthly scale in 2022, and the matching rule for three types of drought events was employed to identify the meteorological-agricultural-hydrological drought event pair with spatiotemporal connections on pentad scale (i. e. , five-day) in 2022, so as to quantitatively reveal the spatiotemporal response characteristics among various drought types in the Yangtze River Basin. The results indicated that three meteorological drought events, two agricultural drought events, and two hydrological drought events lasting longer than two months were extracted on monthly scale in the Yangtze River Basin in 2022, and the three-dimensional spatiotemporal cluster identification method can clearly depict the occurrence, development, and extinction processes of various drought types in time and space. Furthermore, a meteorological-agricultural-hydrological drought event pair, in which a hydrological drought event that was jointly triggered by meteorological drought and agricultural drought events in 2022, was identified based on the matching rule. The migration paths of the three drought types were all from the upper reaches toward the middle and lower reaches, and finally terminated in Hubei, Chongqing, and Hubei, respectively.