Abstract
A need exists to improve the knowledge about and practical description of ice nucleation by aerosols used for cloud modification. Nucleation activity, rate, and mode can depend on temperature, time, vapor concentration, nucleus chemical composition and size, and nucleus thermodynamic history. These complexities are seldom accounted for in cloud models which predict seeding effects. The present research was initiated (a) to improve our understanding of ice nucleation by Agl-type aerosols by performing laboratory experiments in a cloud chamber, (b) to test the current capabilities of a detailed microphysical cloud model to predict ice nucleation in comparison to laboratory experiments for well defined conditions, and (c) to refine the existing mechanistic descriptions of nucleation processes. Toward these ends, ice nucleation experiments in supercooled water clouds are being performed in the CSU dynamic (controlled expansion) cloud chamber and in a detailed microphysical cloud model [1,2]. This paper presents some typical results of this research.
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