| 摘 要： | It is presented that there is a pumping effect at its base in the development process of a cumulus.Inthe strongest stage of cumulus development,the pumping is mainly produced by the buoyance at the base,andmay be taken as the first approximation of the ascending speed at the base.The results of numerical calculations and simulations of four observed radar echoes show that as thefirst approximation,the height of air-mass cumulus may be simulated by Haltiner model in the absence of ob-served ascending speeds at the base,and the Haltiner model can be characterized by the sensitivity of the cumulusdevelopment to the virtual temperature excess over environment at the base.
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