Interannual Variability of Extreme Precipitation during the Boreal Summer over Northwest China

Herein, we investigated the characteristics and mechanisms of interannual variability extreme summer precipitation in northwest China (NWC). The four high-resolution predicting products under assessment indicated that both accumulation daily ≥95th percentile, maxima generally decreased a southeast—northwest direction, while relatively high values were observed Tienshan Qilian Mountain areas. In turn, Tropical Rainfall Measuring Mission (TRMM) satellite dataset underestimated mountainous areas, Asian highly—resolved observational data integration towards evaluation (APHRODITE) Climate Prediction Center (CPC) captured NWC. AMIP-type simulations NWC quite unsuccessful. However, all them can capture increasing trends. Therefore, further found increase is strongly correlated with weakened South high, strengthened Western Pacific Subtropical enhanced westerly jet, mid- to high-latitude Rossby wave trains, whose formation sustenance be traced back sea surface temperature-anomalies western May, June, July. An increased temperature promotes convection induces diabatic heating, which stimulates anticyclonic anomalies disturb resulting barotropic train via Gill-type response. Additionally, it guides more water vapor convergence enhances upward motion over Europe Eastern Asia, cyclonic Central Asia.