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Ice crystal morphology and growth rates at low supersaturations and high temperatures

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1 Author(s)
Colbeck, S.C. ; U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire 03755 and Swiss Federal Institute for Snow and Avalanche Research, Weissfluhjoch/Davos, CH‐7260 Switzerland

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At an excess vapor density (supersaturation of about 10-4) adjacent to the ice crystal surface of 5–6×10-10 g/cc, there is a transition between the highly faceted kinetic growth form and the rounded equilibrium form at temperatures above –6 °C. At lower temperatures there is a transition in the equilibrium form to hexagonal prisms because of a reduction in the disordered surface layer. The growth rate of ice crystals from the vapor is analyzed by a simple model which accounts for vapor flow and surface processes separately. The conditions for highly temperature sensitive growth are identified from the model.

Published in:

Journal of Applied Physics  (Volume:54 ,  Issue: 5 )