contributor author | Bohren, Craig F. | |
contributor author | Battan, Louis J. | |
date accessioned | 2017-06-09T14:21:42Z | |
date available | 2017-06-09T14:21:42Z | |
date copyright | 1980/08/01 | |
date issued | 1980 | |
identifier issn | 0022-4928 | |
identifier other | ams-17977.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4153930 | |
description abstract | Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. Although apparently different, two are shown to be equivalent: the effective-medium and Polder-van Santen theories. All the dielectric functions agree when the two components are dielectrically similar. All except the Maxwell-Garnet dielectric function are symmetric with respect to interchange of the components. When compared with measurements on ice-air mixtures, the effective-medium and Maxwell-Garnet dielectric functions are marginally better than the Debye function, which has previously been used in backscattering calculations. When the fraction of water is high, the effective-medium function gives calculated values of radar backscattering that are in good agreement with measurements on ice spheres coated with a mixture of ice and water. The Maxwell-Garnet theory, with ice inclusions embedded in a water matrix, is also in good agreement with these measurements, and is so over a wider range of water-volume fractions than the effective-medium theory. Although there are no compelling reasons for preferring one above the other, on the basis of the evidence presented, we would be inclined to use the Maxwell-Garnet dielectric function in radar backscattering calculations. | |
publisher | American Meteorological Society | |
title | Radar Backscattering by Inhomogeneous Precipitation Particles | |
type | Journal Paper | |
journal volume | 37 | |
journal issue | 8 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/1520-0469(1980)037<1821:RBBIPP>2.0.CO;2 | |
journal fristpage | 1821 | |
journal lastpage | 1827 | |
tree | Journal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 008 | |
contenttype | Fulltext | |