A Mechanism Study of Torrential Rain Intensifying due to Landing Typhoon
登陆北上台风暴雨突发性增强的一种机制研究

Using a three-dimensional mixing model, the numerical simulation for the process of the torrential rain caused by the landing and moving northward typhoon from 30 August to 2 September 1992 is performed The model can predict the precipitation area and amount associated with surface inverted trough The simulated cloud system structure of typhoon is compared with the satellite cloud pictures and it is showed that the simulated periphery of cloud field coincides with the actual The ability of the model to simulate satellite cloud pictures is examined The direct reason of the rainfall increasing sharply is that the low clouds supplying water vapour for high cloud moved suddenly northward and is overlapped by the high ice clouds Because of the dynamic effects of the strong convergence and lifting from the surface inverted trough, the distribution of all phase cloud system is related to vertical motion The southeast wind jet in low layer on the right of convergence line supplies the water vapour source for rainfall so violent and lasting The adiabatic heating produced by cloud phase change has a positive feedback effect on the rainfall intensifying and maintaining