A Relation Between Reflectivity and Mean Fall Speed in Hail.
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
Pagination or Media Count:
Vertical winds in precipitation can be derived from the Doppler velocity spectrum by comparing V sub 0, the measured power-weighted mean vertical velocity, with w sub 0, the mean obtained from the reflectivity factor, Z sub e. In order to do this, the constants in the expression W sub 0 AZ sup b, sub e must be evaluated. This has been done previously by Rogers for rain, assuming Rayleigh scattering. In this paper, the formula is extended to the non-Rayleigh case of hail spectra. It is shown that b varies with wavelength, and that A depends both on wavelength and on whether the hail is wet or dry.