Heterogeneous Ice Nucleation in the Presence of Aliphatic Amines and Ammonia,
WYOMING UNIV LARAMIE DEPT OF ATMOSPHERIC SCIENCE
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By far the most widely applied principle to deliberate modification of atmospheric precipitation processes has been the creation of additional ice particles in clouds by means of seeding. An alternative approach to modification of cloud processes is the inhibition of ice nucleation activity. There is fairly extensive evidence, mostly from laboratory experiments, that certain vapors can significantly reduce the nucleating abilities of varieties of nucleating materials. The work described in this report was undertaken to expand the background knowledge about such inhibiting processes and to explore the possibilities of applying inhibitors to natural clouds. Three major experimental approaches were employed 1 the freezing of water droplets containing known amounts of nucleants freezing nuclei and additives 2 the activation of deposition nuclei in a static diffusion chamber and 3 field tests.