The Improvement Of The IAP Three-Dimensional Convective Storm Model And Its Application

On the base of the IAP Three-Dimensional Convective Storm Model (IAP-CSM3D), its parameterization of cold-cloud seeding function was improved. Natural ice crystals and artificial ice crystals were entirely detached. In the ameliorated model, artificial ice crystals by cloud seeding were treated as a separate predictand. The spectrum of artificial ice crystal was considered as double-moment parameterization to more accord with fact. And parameterization equations of microphysical processes that contact with artificial ice crystals were also deduced.The interface of Grads was also changed to intuitionistically display the microphysical processes of convetive cloud simulated by the improved IAP-CSM3D.Then a hailstorm event occurred at Chaoyang City on July 8, 2005, was simulated by the improved IAP-CSM3D. The simulated cloud was in accord with the observation. A series of Agl-seeding experiments of the cloud were carried out by different seeding amount and different seeding time. The results show that the more AgI used, the little hailfall is. But when the amount of AgI is too more, the amount of hailfall will become increasing. So the amount of AgI is not too more too better. When the same dosage of AgI seeding was used at different time, the simulated results show that the later seeded the more rainwater get down and the hailstone is reduced in the early but increased in the latter. The improved IAP-CSM3D is better than the older in the effect of reducing hailstone.In addition, three strong convective storm events were simulated by the improved IAP-CSM3D. The results show that the hailstone-producing area has a good relation with fierce updraft. The characters of strong hailstorm were better showed on the simulated natural cloud radar echo. Suitable seeding time is also summarized.