pure and applied geophysics

, Volume 68, Issue 1, pp 186–195 | Cite as

On the growth of ice crystals in supercooled water and aqueous solution drops

  • H. R. Pruppacher


The results of a recent investigation on the free growth rate and the growth forms of ice in supercooled water and aqueous solutions are presented. The results are used to discuss the structure of frozen drops, the structure of hailstones, the mechanisms which are responsible for the glaciation of atmospheric clouds and the mechanisms which cause cloud electrification. It was found that the presence of dissolved salts and dust particles in cloud drops favor the formation of spongy and polycristalline ice, that it is unlikely for frozen cloud drops to develop into hexagonal shaped ice single-crystals, and that it is also unlikely that in atmospheric clouds freezing drops shatter and splinter. The latter result casts serious doubts on the splintering mechanism to contribute to thunderstorm electrification and to promote glaciation of clouds.


Growth Rate Aqueous Solution Dust Hexagonal Dust Particle 
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Copyright information

© Birkhäuser Verlag 1967

Authors and Affiliations

  • H. R. Pruppacher
    • 1
  1. 1.Cloud Physics Laboratory, Department of MeteorologyUniversity of CaliforniaLos Angeles

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