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NUMERICAL SIMULATION EXPERIMENT OF THE FORMATION AND MAINTENANCE OF MESOSCALE LOW

Zhao Si-xiong Zhou Xiao-ping Zhang Ke-su Liu Su-hong(Institute of Atmospheric Physics, Acaderica Sinica)  
Some numerical experiments are performed in order to simulate the formation and the maintenance of mesoscale lows which are frequently observed in the low atmosphere near the low level jet over East China in rainstorm season.It is shown that the effect of wind field disturbances is more significant in the formation and maintenance of mesoscale lows than other meteorological elements. Five sorts of the vertical structure of wind disturbance fields are discussed. Among them, the effect of middle-low level wind disturbances is the strongest in the formation of mesoscale low.The results of numerical experiments of wet model are presented and compared with that of dry model. The phase velocity of gravitational wave is about 44 m/s in the latter model, and in the former model this phase velocity is very close to zero.
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