A review of the physical basis, problems, and research activity on the dynamics of climate, and a description of RAND program in this field. In view of the limited predictability of local weather, the prospects of being able to say something about the average character of the weather over longer time periods is reviewed, including the climatic variations which might result from man's advertent or inadvertent changes. The numerical climate model used at RAND produces results that agree fairly well with observation, although systematic errors remain. Efforts are under way to include in the model the circulation of the ocean, the atmospheric boundary layer, and a more accurate parameterization of the rainfall that occurs during local convective showers. Future climatic simulation experiments of several years' length on the Illiac IV computer are envisaged. (Reprinted from the RAND 25th Anniversary volume.) 16 pp.
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