Accession Number : AD0426171

Title :   RAINDROP-SIZE STUDIES.

Descriptive Note : Final rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR COLL OF ENGINEERING

Personal Author(s) : Dingle,A. Nelson

Report Date : OCT 1963

Pagination or Media Count : 23

Abstract : Qualitative analysis of raindrop-size distributions in heavy showers indicates that some of their prominent features can be explained by the combined effects of wind-shear sorting of drops and of the splashing of large drops upon surface obstructions. Computational studies which account for the effects of cloud-droplet accretion, raindrop coalescence, and evaporation processes indicate that, in steady-state rain, the origin of large drops lies in snow-aggregation processes above the melting layer. Extending this finding to speculate upon observed differences between heavy shower drop-size distributions in June as compared to October, it is suggested that the relative predominance of the ice-crystal or water-drop processes in convective storms may be indicated by features of the ground-level drop-size distributions. (Author)

Descriptors :   (*RAINDROPS, ATMOSPHERIC PRECIPITATION), CLOUDS, ICE, PHOTOMETERS, WIND, SHEAR STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE