Abstract:Based on the sea surface temperature (SST) from Hadley Center, the precipitation data of GPCP, NCEP/NCAR reanalysis data, the variability of boreal spring south tropical Atlantic (STA) SST anomaly (SSTA) and its association with boreal summer precipitation in Asian-Australian monsoon region are investigated by using statistical analysis methods. The results indicate that there is a significant negative (positive) relationship between boreal spring STA SSTA and subsequent summer precipitation anomalies in tropical western Pacific-South China Sea (seas to the eastern Australia-tropical eastern Indian Ocean). The spring positive STA SSTA can generate an anomalous vertical circulation over the equatorial Atlantic and tropical Pacific. The anomalous descending and low-level divergence over the tropical central Pacific can induce anomalous easterly in the tropical western Pacific which trigger negative SSTA in the tropical central eastern Pacific. Due to the Bjerknes positive feedback mechanism, the SSTA in the tropical central eastern Pacific can be enhanced from boreal spring to summer. As a Rossby wave response to the negative SSTA in the tropical central eastern Pacific, a pair of anomalies anticyclone in 850hPa are induced over the western Pacific in boreal summer. Meanwhile, there are anomalous easterly in 850hPa from tropical western Pacific to Maritime continent, which are unfavorable (favorable) for water vapor to tropical western Pacific-South China Sea (seas to the eastern Australia-tropical eastern Indian Ocean), leading to less (more) precipitation.