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Some observations of drop-size distributions in low layer clouds

✍ Scribed by F. Singleton; D. J. Smith

Publisher
John Wiley and Sons
Year
1960
Tongue
English
Weight
866 KB
Volume
86
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

125 drop samples in ten layers of low cloud of thickness 700‐7,500 ft (210‐2,300 m) have been obtained using the magnesium‐oxide coated‐slide technique. These observations are discussed in terms of the condensation‐coalescence mechanism. Comparison has been made between these observations and a similar set, also obtained by the Meteorological Research Flight, Durbin (1959), for convective cloud, from which it is shown that the coalescence process is in greater evidence in the layer clouds. Values of water content deduced from the drop spectra are higher than those previously reported by other workers and correspond in magnitude to the full adiabatic values suitably modified by redistribution within the cloud.

Some measurements are also discussed relating to the effect of the aircraft on the representativeness of the drop samples. The extension of the magnesium‐oxide calibration to drops larger than 100 μ diameter has also been examined experimentally.

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