WMOD00298

• Title: Quantifying Ice Nucleation by Silver Iodide Aerosols
• Date: 5/1/1990
• State: CO
• Weather Modification - Doc Type: Report

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chamber. The model was utilized as a diagnostic tool to estimate water

and the transferability of results was evaluated by modeling two actual

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supersaturation in association with experiments and it was used for

comparison of the predictions of new ice nucleus formulations with

observations from generalized seeding simulations conducted in the

cloud chamber. The nucleant and mode-specific formulations represent

vast improvements compared to available formulations for "pure" AgI.

The general implications of these new results were tested by using the

model to simulate a few common seeding situations in the atmosphere,

seeding experiments conducted in summertime cumuli. Within the

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limitations of the cloud model used, agreement with the atmospheric

results was very good. The results of this study should be most useful

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for designing standard and better methods for the quantitative study of

ice nucleation by artificially generated and natural aerosols, and for

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evaluating cloud seeding methodologies and potential seeding effects

using more complex microphysical-dynamic cloud models.

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Paul Judson DeMott
Atmospheric Science Department
Colorado State University
Fort Collins, CO 80523
Spring 1990

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