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A. Nelson Dingle


Because of its relative insensitivity to changes of station location and to such natural phenomena as volcanic activity, precipitation is a promising weather element for the study of secular changes of the general circulation. A study of the precipitation records for individual stations, smoothed by the use of decadal moving averages, suggests that the prominent precipitation trends are continuous in time and space. A preliminary synoptic study of the interdecadal changes of average precipitation reveals details of the circulation changes in regard to cyclonic activity and moisture supply.

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Per B. Storebø and A. Nelson Dingle


A configuration with rain falling through a shallow flow of pollution-loaded air is examined theoretically. The pollution particles are made up of (NH4)2SO4 mixed with graphite. A numerical feedback technique is used for calculating the development of the droplets having the particles as nuclei, as they pass over a 300 m high ridge under steady exposure to removal by raindrops.

The development of state parameters for air and vapor, together with droplet sizes, temperatures, equilibrium humidities, and rate of removal over the distributions are discussed. Dissipation of kinetic fall energy for droplets is shown to affect droplet behavior. Removal of pollution from low-level air by rain appears to be quite efficient.

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