Summary/Abstract
Summer monsoon frontal rainfall in East Asia significantly affects water resources and flood hazards in densely populated areas. Recent studies have documented the increasing intensity of summer frontal rainfall over recent decades. However, the extent of ongoing climate change on the intensification of the East Asia frontal precipitation system remains uncertain. In this study, the authors use an objective method for detecting frontal systems, and find a 17 ± 3% increase in observed frontal rainfall intensity during 1958 to 2015. Climate model simulations with and without greenhouse gases suggest that anthropogenic warming plays a key role in the intensification of East Asia summer frontal precipitation by 5.8% from 1991 to 2015. The analysis highlights that enhanced water vapor convergence and reinforced western North Pacific subtropical High collectively increased moisture transport to the region, resulting in intensified East Asia frontal precipitation. The results lend support to the anthropogenic warming–induced enhancement of the East Asia frontal precipitation and its persistence in the future.