Interdecadal Variation in the Impact of Tropical Pacific Sea Surface Temperature on Compound High Temperature‐Drought Events and Related Wildfire Over Eurasia During Summer

Abstract The tropical Pacific sea surface temperature anomalies (SSTAs) act as a crucial regulator of global climate variability and serve as an important predictive source for extreme climate events. In this study, the impact and corresponding mechanisms of tropical Pacific SSTAs on compound extreme high temperature and drought events (CHTDE) and related wildfire are investigated based on the observed and reanalysis data sets. The results indicated that the relationship between the boreal summer tropical Pacific SSTAs and a Eurasian quadrupole atmospheric teleconnection has been enhanced since the mid‐1980s. After the mid‐1980s, the warm SSTAs in central‐eastern Pacific lead to the extremization of CHTDE and increasement of wildfire in Western Europe and Northern Central Asia, while cold SSTAs have similar effects in Eastern Europe and East Asia. This is primarily related to the westward shift of tropical Pacific SSTAs, which could trigger enhanced poleward and eastward propagation of Rossby waves and accelerate the circumpolar jet over the Kara Sea and the Laptev Sea and subtropical jet over southeastern Europe, leading to an intensification of the summer double jets event. The double jets could create favorable dynamic modulation of thermodynamic and water vapor transport in Eurasia. Therefore, this ocean‐atmosphere coupled mode results in a quadrupole pattern of disaster in Eurasia, which also has been verified by climate models. This study underscores the enhanced influence of the summer tropics on extreme events in Eurasia, offering valuable references for extreme events and wildfire early warning in Eurasia.