Accession Number : AD0428252

Title :   AN INVESTIGATION OF PRECIPITATION ATTENUATION AND ITS APPLICATION IN A DUAL-FREQUENCY RADAR MORPHOLOGY OF SUBTROPICAL PRECIPITATION,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION

Personal Author(s) : Greene,Douglas Richard

Report Date : JAN 1964

Pagination or Media Count : 109

Abstract : An indication of the magnitude of precipitation attenuation may be obtained by observation of a single, convective, precipitation echo with a dual-frequency radar system. The applicability of this attenuation in the study of convective liquid precipitation is investigated. The attenuation factor is calculated by use of the rigorous Mie solution for the total attenuation cross section and the Marshall-and-Palmer dropsize distribution. The attenuation factor is related to rainfall rate and liquid-water content. Analysis reveals that the in-cloud vertical velocity field must be known in order to relate the attenuation factor to rainfall rate. The problem of forward scattering by both solid and liquid precipitation is examined. For small, liquid-water drops, the amount of forward scattered energy is insignificant; however, for large ice particles, forward scattering becomes important. (Author)

Descriptors :   (*ATMOSPHERIC PRECIPITATION, ATTENUATION), (*RADAR INTERFERENCE, ATMOSPHERIC PRECIPITATION), RAINFALL, RAINDROPS, METEOROLOGICAL RADAR, MATHEMATICAL ANALYSIS, ABSORPTION, HAIL

Distribution Statement : APPROVED FOR PUBLIC RELEASE