Abstract
The summertime precipitation over the Qinghai-Xizang Plateau is simulated by a cloud-resolving model WRF. Compared with the TRMM data,the model can capture the distribution and the diurnal variation of the precipitation well. A moisture budget is calculated by using the high resolution model results. It shows that the precipitation mainly comes from the moisture flux convergence. Moisture flux convergence is mainly in the lower atmosphere. It is closely related to the nighttime low-level jet in the south and has strong diurnal variation. The vertical advection term transports the moisture from the low to the middle and high levels. The local change term is very small. The evaporation over the plateau during summer mainly focuses at 03: 00- 09: 00 UTC and is generally one half of the precipitation,indicating the importance of the regional moisture recycle.
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