Warming?Induced Northwestward Migration of the Asian Summer Monsoon in the Geological Past: Evidence From Climate Simulations and Geological Reconstructions

The cold and warm intervals during the Plio-Pleistocene provide an opportunity to assess response of Asian summer monsoon (ASM) different levels global warming. In this study, northern edge ASM, a sensitive indicator advance retreat ASM rain belt, was analyzed using climate outputs from PMIP3 PlioMIP1, for Last Glacial Maximum (LGM, ?21,000 yr BP), preindustrial, mid-Holocene (?6,000 mid-Pliocene (?3.3–3.0 Ma), among which temperature increased sequentially. results show that migrated northwestward by ?200 km, ?50 km with warming LGM preindustrial mid-Holocene, mid-Pliocene, respectively. These are generally consistent geological records. simulations western Pacific subtropical high (WPSH) intensified expanded geographically, intertropical convergence zone (ITCZ) northward over Indian Ocean shifted southward Pacific. This led shift monsoonal consequently wetter conditions in India China. During pronounced substantially WPSH, leading suppression moisture transport southern China Indo-China Peninsula. Our suggest if planet returns Pliocene world, precipitation will increase China, while Peninsula experience more frequent droughts.