Parameterization of Ice Growth for Numerical Calculations of Cloud Dynamics.

by Lloyd Randall Koenig

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Parametric equations describing the growth of ice particles are presented in the range 10 to the minus 11th power g to 1 g. The parametric equations were developed with the aid of a complex method for calculating ice-particle growth. Two approaches to using the parametric equations in a simulation resembling a natural cloud situation are described. One method breaks the ice-particle spectrum into three components and monitors the sizes of each. The other assumes a size distribution that can be characterized by a "growth-median" size, so that only one size need be monitored to describe the rate of growth. The parametric method is compared with more complicated methods in a simulated cloud environment, and the results are regarded as satisfactory. 34 pp. Ref.

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