The fall speeds of sub-100 micron ice crystals

Details The fall speeds of sub-100 micron ice crystals The fall speeds of sub-100 micron ice crystals

2008-01-10

arxiv.org/abs/0801.1618v2

Physics

Atmospheric and Oceanic Physics

Scientific paper

10.1002/qj.290

Estimates for the sedimentation rate of realistic ice crystals at sizes smaller than 100 $\mu$m are presented. These calculations, which exploit new results for the capacitance of ice crystals, are compared with laboratory studies and found to be in good agreement. The results highlight a weakness in contemporary ice particle fall speed parameterisations for very small crystals, which can lead to sedimentation rates being overestimated by a factor of two. The theoretical approach applied here may also be useful for calculating the sedimentation rate and mobility of non-spherical aerosol particles.

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