The Relationship Between Quasi-biennial Oscillation (QBO) of Equatorial Stratosphere and the Rainfall Belt of July in China

Based on the QBO data during 1953~1991, the relationship between QBO of mean zonal wind at 30~50 hPa and the rainfall belt of July in China is analysed. The results show that the position of rainfall belt in July would be to the north when it is west phase, and to the south when it is east phase. Their relations are mainly connected by the influence of QBO at equatorial stratosphere on tropospheric circulation. By using the variable rule of equatorial stratratospheric zonal wind and the characteristics of North Pacific tropospheric circulation in winter, there is practical value for the forecast of rainfall belt of July in China