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<br />Pitter, R. L., and R. Zhang, 1989: Effect of internal charge dislribution in ice crystals on scavenging of
<br />aerosol particles. Proceedings, 5th WMO Scientific Conference on Weather Modification and Applied
<br />Cloud Physics, Beijing, China, May 8-12, 1989. World Meteorological Organization, Geneva,
<br />WMOffD-No. 269, 11:643-646.
<br />
<br />No abstract.
<br />
<br />Pitter, R. L., and W. G. Finnegan, 1988: Field observations of ice crystal forrnation in clouds at warm
<br />temperatures. Journal of Weather Modification, 20:54..59.
<br />
<br />A field study of the effect of treating a shear line convective cloud with a 20% aqueous solution of
<br />ammonium carbonate is described. The results indicate that the presence of certain soluble salts in
<br />growing ice crystals may be sufficient to initiate ice crystal multiplication in clouds at temperatures
<br />of -40 to -50C, as measured by a Rosemount instrumefllt, or -30C, as measured by a reverse flow
<br />thermometer. The field results are consistent with laboratory experiments conducted in the
<br />Desert Research Institute's cloud chamber, where ice multiplication was observed at temperatures as
<br />warm as _40C. In the cloud chamber experiments, ice multiplication, only occurred when crystals were
<br />growing rapidly and aggregating. Aggregation was more readily observed when certain soluble salts
<br />were added to the water which formed the supercooled, cloud. A postulate is advanced as an
<br />explanation of the ice multiplication observed in the laboratory and field studies.
<br />
<br />Pitter, R. L., and W. G. Finnegan, 1988: Ice electro nucleation: Laboratory and field evidence in support of a
<br />new mechanism of ice nucleation. Atnwspheric Aerosols and Nucleation, P. E. Wagner and G. Vall
<br />(eds.), Springer-Verlag, Vienna, 713-716.
<br />
<br />No abstract.
<br />
<br />Pitter, R. L., and W. G. Finnegan, 1988: Studies of cloud microchemical physics. Preprints, 10th International
<br />Cloud Physics Conference, IAMAP/lUGG, Bad Homberg, FRG., August 15-20, 1988. Annalen der
<br />Meteorologie, No. 25, ISBN 3-88148-240-7, 1:243-245.
<br />
<br />No abstract.
<br />
<br />Pitter, R. L., and W. G. Finnegan, 1987: Observations of spontaneous ice formation in a cloud chamber:
<br />A new process of abnospheric ice multiplication. Preprints, 11th Conference on Weather Modification,
<br />Edmonton, Alberta, Canada, October 6-8, 1987. American Meteorological Society, Boston, MA, 52-55.
<br />
<br />No abstract.
<br />
<br />Pitter, R. L., and W. G. Finnegan, 1986: Effect of the size disltribution of falling snow on aerosol particle
<br />scavenging. Preprints, Conference on Cloud Physics, Snowmass, CO, September 22-26, 1986.
<br />American Meteorological Society, Boston, MA, Vol. 2, 71-74.
<br />
<br />No abstract.
<br />
<br />Politovich, M., and R. F. Reinking, 1987: Characteristics of updrafts in centrallllinois cumuli. Preprints,
<br />11th Conference on Weather Modification, Edmonton, Alberta, Canada, October 6-8, 1987. American
<br />Meteorological Society, Boston, MA, 68-71.
<br />
<br />No abstract.
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