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Measurements of Ice Crystal Concentration in Clouds

S. C. MossopRadiophysics Laboratory, CSIRO, Sydney, Australia

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A. OnoRadiophysics Laboratory, CSIRO, Sydney, Australia

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Abstract

Measurements of ice crystal concentration in five clouds in northern New South Wales are reported. These confirm earlier studies in which it was found that glaciated altostratus clouds contain approximately the same concentration of ice crystals and ice nuclei. On the other hand, cumulus and stratocumulus, generally sampled at temperatures >−10C, were found to contain about 103 times as many ice crystals as expected on the basis of ice nucleus measurements.

Abstract

Measurements of ice crystal concentration in five clouds in northern New South Wales are reported. These confirm earlier studies in which it was found that glaciated altostratus clouds contain approximately the same concentration of ice crystals and ice nuclei. On the other hand, cumulus and stratocumulus, generally sampled at temperatures >−10C, were found to contain about 103 times as many ice crystals as expected on the basis of ice nucleus measurements.

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