THE MODIFICATION OF AEROSOL SIZE DISTRIBUTION IN THE ATMOSPHERE.
Final technical rept., 1 July 63-30 June 64,
MAINZ UNIV (GERMANY F R)
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A comprehensive quantitative study is made of the various processes in the atmosphere which are known to have an effect on the size distribution of natural aerosols. One of the most important processes is the coagulation of aerosol particles by Brownian motion which is always in operation inside and outside of clouds. Smoluchowskis expression for this process is evaluated for various model distributions of atmospheric aerosols. In this study a first attempt is made of a quantitative formulation of all those processes which modify the aerosol distribution in the course of these condensation cycles. Important parameters which enter these calculations are the fraction of troposheric air occupied by clouds, the number of condensation cycles, the life time of clouds and the concentration of clouddroplets. The calculations are performed for various combinations of these parameters. Author