This study investigates the relationship between extreme precipitation and temperature in Japan, focusing on the impact of synoptic patterns. Using long-term historical records and an event-based analysis, the researchers find that persistent precipitation events (lasting over 10 hours), often associated with atmospheric river-like circulations, exhibit a sharper increase in peak intensity with rising temperatures than shorter-duration events. Long-duration accumulated precipitation extremes increase at a rate significantly above the Clausius-Clapeyron rate at higher temperatures, highlighting increased flood and landslide risks in mid-latitude coastal regions.
