福建一次秋季暴雨天气过程的机制分析

o analyze the mechanism of autumn rainstorm, a large-scale rainstorm process during 8-10 November 2011 in Fujian is simulated using the Weather Research & Forecasting (WRF) model. Based on reliable simulation, the dynamic and thermodynamic diagnosis is analyzed. The results suggest that the heavy rainfall with long duration and uniform precipitation are influenced by the collective effects of southwest jet in the south side of the mid-level shear, northward movement of low-level tropical depression, and cold air from the north.There are obvious different stages during the whole process and different mechanisms of inland and coastal precipitation.The precipitation location is closely related to the southwest jet convergence line and low-level jet pulsation; Low-level negative temperature region imbricate with upward motion region and low-level positive absolute vorticity region imbricate with negative divergence region, which determine the precipitation area well. The positive vorticity column and the negative divergence column correspond to the strongest hourly precipitation, hence they can be used to indicate the rainfall area and rainfall intensity, providing a reference for Fujian autumn storm forecast.