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长江中下游中尺度云团演变过程的数值模拟
Numerical Simulation of the Evolution of a Mesoscale Cloudcluster over the Middle and Lower Reaches of the Changjiang River
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摘要: 本文用中尺度五层原始方程模式，模拟了长江中下游中尺度云团的生成、强盛和减弱。结果表明，由这个模式，用实测大尺度资料，可以模拟出伴有暴雨的云团演变过程。此外，对于原模式作了一些改动，加进了地形作用。与无地形的数值试验相比，地形作用有利于在长江中下游形成一条近于东西方向的切变线，对系统的发展有促进作用。Abstract: A five level mesoscale primitive equation model has been used to simulate the initiation, mature and weakening stages of a mesoscale cloudcluster over the middle and lower reaches of the Changjiang River in 1982. The results show that the evolution of the cloudcluster with heavy rainfall can be simulated by this model with observed large scale regular data.Furthermore, the model has been modified to incorporate the orographic effects. In comparison to the numerical experiment without terrain influences, the orographic effects in the model would contribute to the formation of E-W shear line and promote the development of the cloudcluster
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