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NUMERICAL EXPERIMENTS PERTAINING TO WARM-FOG SUPPRESSION
L. Randall Koenig
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Abstract
An examination of the problems involved in applying seeding techniques for the improvement of visibility in natural warm fogs. This Memorandum presents a quantitative assessment of the prospects of modifying warm fogs, i.e., fogs composed of droplets warmer than 0 deg C, by seeding them with condensation nuclei. In the experiments performed, initial conditions consist of a homogeneous volume of air of specified height and aerosol content. An external cooling rate and seed dosage are specified. The effects of various combinations of cloud height, seed properties (such as size, mass density, and rate of injection) and the metamorphosis of the fog-droplet population are examined. The cloud-forming process is allowed to continue after seeding has been accomplished, and tentative conclusions are drawn regarding the ranges of seed dosages that might result in successful efforts to suppress warm fog. A discussion of the basis of the calculations of the meteorological range is included.