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The Densities and Growth Rates of Ice Crystals between −5C and −9C

B. F. RyanDivision of Cloud Physics, CSIRO, Sydney, Australia

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E. R. WishartDivision of Cloud Physics, CSIRO, Sydney, Australia

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Edmond W. Holroyd IIIDivision of Cloud Physics, CSIRO, Sydney, Australia

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Abstract

The mass of columnar ice crystals between −5C and −9C has been measured as a function of time. It is shown that the measured growth rates are not markedly different from the empirical formula proposed by Hindman and Johnson. However, during the first 3 min of growth the parametric form of the axial dimensions can be adequately described by a linear function of time rather than a power law.

Over the same temperature range the bulk density/temperature curve deduced by Fukuta is valid for time periods at least as long as 3 min and for a wide variety of ice crystal concentrations.

Abstract

The mass of columnar ice crystals between −5C and −9C has been measured as a function of time. It is shown that the measured growth rates are not markedly different from the empirical formula proposed by Hindman and Johnson. However, during the first 3 min of growth the parametric form of the axial dimensions can be adequately described by a linear function of time rather than a power law.

Over the same temperature range the bulk density/temperature curve deduced by Fukuta is valid for time periods at least as long as 3 min and for a wide variety of ice crystal concentrations.

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