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Entrainment and the droplet spectrum in cumulus clouds

✍ Scribed by P. R. Jonas; B. J. Mason

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
950 KB
Volume
108
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

The model of the development of the droplet spectrum in cumulus clouds described by Mason and Jonas (1974) has been used to calculate the spectrum in penetrating downdraughts and the changes which occur when a region of dry air resulting from such a downdraught is subsequently forced to rise. It is shown that evaporation in the downdraught does not remove equal fractions of droplets of all sizes; indeed concentrations of some radii may be higher than those in the surrounding cloud. When such a dry parcel is forced to ascend again the droplet spectrum within this region is similar to that in the surrounding cloud and fresh activation of nuclei prevents the rapid growth of a small concentration of large droplets entrained into the region from the surrounding cloud. It is also shown that droplet growth in a subsequent thermal entraining material from the older cloud is little affected if the latter affected if the latter is considerably diluted by penetrating downdraughts.

πŸ“œ SIMILAR VOLUMES

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