| The three-dimensional convective storm numerical model system is based on the three-dimensional convective storm model (CSM3D) developed in the Institute of Atmospheric Physics (1AP), Chinese Academy of Sciences. This system is an interactive system running in Windows Operating System and can be used in severe convective cloud numerical simulation and numerical forecast In the system designation, software is programmed in VC++, Fortran and grads. Mixed-languages programming (VC++ and Fortran), multithreading programming, VC++ interface programming and Windows Shell programming are applied. The severe convective cloud numerical simulation system is migrated from DOS Operating System to Windows Operating System. The modules of the model are rearranged. The interface of the system is based on Windows and is interactive and easy to operate.In this paper, the Agl-seeding effects for the convective clouds occurring in Beijing on July 5, 2003 were evaluated by using the three-dimensional convective storm model. Detailed simulations on rain enhancement with a rocket fired at different time, elevations, distances and seeded in different areas of cloud were analyzed. The results show that a positive effect of rainfall enhancement can be obtained when seeding in suitable parts of the clouds. A greater benefit in the rainfall enhancement effect can be gotten when seeded in the developing stage. The shooting elevation of rocket has a great influence on the effect The principle chosen the optimal shooting elevation was given and the mechanism of rainfall enhancement by Agl-loading rockets was also analyzed in this paper. From those results obtained above, we expect to get some references to the improvement of the seeding efficiencies in practice.
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