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Inadvertent Weather Modification and Los Angeles Smog

Hidy, G. M. and Green, W. and Alkezweeny, A. (1972) Inadvertent Weather Modification and Los Angeles Smog. In: Aerosols and Atmospheric Chemistry: The Kendall Award Symposium Honoring Milton Kerker. Academic Press , New York, NY, pp. 339-344. ISBN 978-0-12-347250-2.

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The potential mechanisms for inadvertent weather modification by anthropogenic aerosols are reviewed briefly. Within this framework, limited measurements of cloud condensation nuclei and ice nuclei taken during the 1969 Pasadena experiment are discussed. The condensation nuclei observations were made with an MRI thermal diffusion counter and the ice nuclei were made using a Millipore filter technique. The results suggest that the cloud condensation nuclei counts are in the range of 10^3 cm^(-3) at 0.5% water vapor supersaturation, and they increase during the day in rough correspondence with the second moment of the aerosol distribution. On the other hand, the ice nuclei counts are in the range of 200 m^(-3) at 18°C, and appear to decrease during the day. Such diurnal behavior may be related to the "poisoning" of otherwise active nuclei in the presence of organic material in the Los Angeles atmosphere.

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Additional Information:© 1972 Academic Press. Received April 28, 1971; accepted May 3, 1971. This project was supported partly by funds from the U. S. Public Health Service under Grant AP-00580.
Funding AgencyGrant Number
US Public Health Service (USPHS)AP-00580
Record Number:CaltechAUTHORS:20150805-120015902
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Official Citation:G.M. HIDY, W. GREEN and A. ALKEZWEENY, Inadvertent Weather Modification and Los Angeles Smog, In Aerosols and Atmospheric Chemistry, edited by G.M. HIDY, Academic Press, 1972, Pages 339-344, ISBN 9780123472502, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59246
Deposited By: George Porter
Deposited On:06 Aug 2015 21:28
Last Modified:10 Nov 2021 22:17

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