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2012•The Journal of Weather ModificationOpen access

Ice Nucleation Silver Iodide-Sodium Iodide: A Reevaluation

Rochelle R. Blumenstein, W. Finnegan, Lewis O. Grant

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Abstract

New, preliminary, laboratory studies of the 2Agl.Nal ice nucleus are being conducted in the CSU Isothermal Cloud Chamber. Rates and mechanisms of ice nucleation are investigated using chemical kinetic methodology. Interrelationships between ice nuclei effectiveness, rates and mechanisms of nucleation, and chemical composition are studied. The use of chemical kinetics in the study of ice nucleation is described by DeMott, et al. (1983). The 2Agl.Nal hygroscopic aerosol nucleates the ice phase by a condensation freezing process. This process is sensitive to supersaturation with respect to water. When water supersaturation is increased to a still unknown but critical value, the rate of nucleation increases, the mechanism of nucleation changes, and the effectivity increases significantly. The results have utility in cloud modification.

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What this paper is about

New, preliminary, laboratory studies of the 2Agl.Nal ice nucleus are being conducted in the CSU Isothermal Cloud Chamber. Rates and mechanisms of ice nucleation are investigated using chemical kinetic methodology. Interrelationships between ice nuclei effectiveness, rates and mechanisms of nucleation, and chemical composition are studied. The use of chemical kinetics in the study of ice nucleation is described by DeMott, et al. (1983). The 2Agl.Nal hygroscopic aerosol nucleates the ice phase by a condensation freezing process. This process is sensitive to supersaturation with respect to water. When water supersaturation is increased to a still unknown but critical value, the rate of nucleation increases, the mechanism of nucleation changes, and the effectivity increases significantly. The results have utility in cloud modification.

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Available abstract

New, preliminary, laboratory studies of the 2Agl.Nal ice nucleus are being conducted in the CSU Isothermal Cloud Chamber. Rates and mechanisms of ice nucleation are investigated using chemical kinetic methodology. Interrelationships between ice nuclei effectiveness, rates and mechanisms of nucleation, and chemical composition are studied. The use of chemical kinetics in the study of ice nucleation is described by DeMott, et al. (1983). The 2Agl.Nal hygroscopic aerosol nucleates the ice phase by a condensation freezing process. This process is sensitive to supersaturation with respect to water. When water supersaturation is increased to a still unknown but critical value, the rate of nucleation increases, the mechanism of nucleation changes, and the effectivity increases significantly. The results have utility in cloud modification.

Key concepts: Supersaturation, Nucleation, Ice nucleus, Silver iodide, Cloud condensation nuclei, Isothermal process, Cloud chamber, Chemistry

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