Increasing Synchrony of Extreme Heat and Precipitation Events Under Climate Warming

Abstract Extreme weather events severely impact human and natural systems, and their impacts would be exacerbated when events occur synchronously. Extensive studies have examined changes in individual events under global warming, but changes in the synchrony of multiple events remain less understood. Here we quantify the synchrony of extreme heat and precipitation events over global land areas and assess how it responds to climate change. We show regional disparities with stronger synchrony in lower latitudes and weaker in middle latitudes. Since the 1980s, the synchrony has increased by 34%, especially in the tropics and northern high latitudes. Climate simulations project an 87% increase by 2100 under Shared Socioeconomic Pathway (SSP) 5–8.5 relative to historical level, while low‐emission scenarios (SSP1‐2.6 and SSP2‐4.5) can help mitigate the increased risk of synchronous events. Increasing synchrony is primarily driven by climate warming, and this scaling relationship depends on global warming level rather warming path.