Decadal Shift in Summer Precipitation Variability over East Asia in the Mid-2000s and Wave Propagation toward North America

Abstract The East Asian summer climate displays a marked change after the late 1990s. This is principally due to weakening of Pacific–Japan (PJ) teleconnection pattern that was dominant driver precipitation variability over Asia. Nevertheless, western Japan has frequently experienced heavy rainfall events past several years. Atmospheric reanalysis and observational datasets are used investigate Asia in view interdecadal changes from 1979 2020. increased most Japan, especially around Southwest Islands southern where cumulus convection been more for characteristic including mei-yu–baiu than frontal structure since mid-2000s. analysis vertical structures convective instability indicates moist neutralized by China Sea off Pacific coast recent warming sea surface temperature (SST) along Kuroshio exceeds SST threshold convection. decadal shift close relationship with second mode Asia, which taken place PJ as leading decade. enhanced enabled act forcing mechanism Rossby wave train toward North America westerly jet or eastward extension Silk Road pattern, possibly favors heatwave Northwest areas America.