Abstract
The water vapor data by HALOE from 1993 to 2002 were analyzed to study the major variance of interannual variability, Quasi-Biennial Oscillation (QBO). Three centers of water vapor QBO located in upper, middle and lower stratosphere were found. The simulation results from model SOCRATES3 indicated that the QBO forcing of tropical zonal wind would induce three pairs of residual circulations, the transportation of which played an important role in the cause of water vapor QBO's formation. The QBO of temperature could control the chemical production of water vapor in the middle stratosphere. On the other hand, the temperature's QBO had an important effect on the water vapor condensation in the lower stratosphere.
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