Stochastic riming of plate-like and columnar ice crystals |
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| Authors: | Klaus D Beheng |
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| Institution: | (1) Institut für Meteorologie und Geophysik der Universität Frankfurt, 6000 Frankfurt/Main, Germany |
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| Abstract: | Riming growth of ice particles is simulated by numerically solving the stochastic collection equations, simultaneously considering coagulation of water droplets. By introducing a special criterion which defines the habit of a riming particle, the influence of this habit on the growth of several kinds of ice particles assumed to be formed during riming was investigated.It was found that (i) hexagonal rimed ice plates are growing more efficiently than lump graupel or rimed columns, (ii) the use of different collection kernels for the lump graupel evolution leads to widely differing results and that (iii) the time dependent decrease of liquid water substance and the size of the resulting ice particles were more strongly influenced by the initial ice crystal concentration than by the initial ice crystal size and the habit of the ice particles. By decreasing the number density of ice crystals gradually a critical ice crystal concentration was found at which the present liquid water was not completely consumed by the riming process even after 1800 s model time, causing large drops of radii >100  m to be formed in appreciable concentrations. |
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| Keywords: | Riming of ice crystals |
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