Light Scattering by nonspherical raindrops: implications for lidar remote sensing of rainrates.

Macke, Andreas and Grossklaus, Martin (1998) Light Scattering by nonspherical raindrops: implications for lidar remote sensing of rainrates. Journal of Quantitative Spectroscopy and Radiative Transfer, 60 (3). pp. 355-363. DOI 10.1016/S0022-4073(98)00011-9.

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Abstract

The single scattering properties of nonspherical raindrops have been calculated by
means of the geometric optics approximation to ascertain the usefulness of lidar remote sensing
of rainrates. Based on the theoretical hydrodynamical studies of Chuang and Beard (J. Atmos.
Sci., 1990, 47, 1374Ð1389), a Chebyshe¤-series of shape coe¦cients has been selected to account
for the size dependent particle nonsphericity. The single scattering calculations for randomly
oriented raindrops with particle radii ranging from 0.5 to 4.5mm exhibit a very pronounced
dependence of the phase matrix on particle shape. However, most of these changes are not
monotonic with increasing size, which complicates correlations between rainrates and the
radiative properties of the raindrops. A comparison of ray tracing results by Chebyshe¤-type
particles and axis-ratio equivalent spheroids shows signiÞcant di¤erences for particles with
radii larger than 1 mm. Backscattering intensity as well as linear and circular depolarization
ratios for horizontally oriented raindrops show a non-monotonic increase with particle size.
The size distribution averaged backscattering properties are poorly correlated with rainrates.
We conclude that lidar remote sensing of rainrates does not seem to be a promising attempt.
However, this conclusion may be subject to changes if raindrop oscillations, which have not
been considered in this study, a¤ect the size distribution averaged backscattering properties.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0022-4073(98)00011-9
ISSN: 0022-4073
Date Deposited: 18 Feb 2008 17:24
Last Modified: 18 Aug 2017 08:05
URI: http://oceanrep.geomar.de/id/eprint/7930

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