The mountain iron diffusion program

From November, 1965 through July, 1966 a large-scale program designed to illuminate the diffusion characteristics of marine air over coastal range mountains was carried out in Southern California, at Vandenberg Air Force Base. The experimental design for this program is outlined, and salient features of diffusion analysis are presented. The technique developed for predicting plume width, based on the Hay-Pasquill running average method, indicated that β = 200/σθ, much larger than heretofore reported for unstable conditions. The prediction of centerline exposures over mountainous terrain was shown to be dependent upon temperature stratification in a different manner than observed over level terrain, and that exposures were generally lower and less dependent upon both season and time of day over mountainous country. (author)