Experimental determination of the multiple-scattering effect on the lidar-signal polarization characteristics during liquid- and solid-phase precipitation |
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Authors: | B Tatarov I Kolev |
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Institution: | (1) Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko shosse blvd., Sofia 1784, Bulgaria, BG |
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Abstract: | We present results of experimental investigations of the signal-polarization characteristics in the case of lidar sounding
during precipitation. We show and discuss the lidar signals and the depolarization profiles along the sounding path for liquid-
and solid-phase precipitation. In the former case we compare the signal characteristics at different degrees of precipitation
rate. In the latter situation, we consider snowfall with particle shape close to that of Chebyshev particles. We also follow
the lidar-signal changes depending on the field-of-view of the receiving optics. The experimental data are compared with results
of theoretical estimates and models concerning the optical and microphysical characteristics of the rain and snow particles.
In the case of liquid-phase precipitation – rain – the observed dependence of the lidar’s signal-polarization structure on
the precipitation intensity has two aspects: on the one hand, the change of the raindrops’ shape, and, on the other, the multiple-scattering
effects. The lidar data demonstrate that the signal depolarization, and, more specifically, its behavior along the sounding
path, can be used as a criterion for the presence of multiple scattering. In the case of a snowfall consisting of Chebyshev
particles, the simultaneous role is evident of two factors influencing the lidar-signal depolarization, namely, the non-spherical
shape of the particles and the multiple-scattering effects. When the scattering takes place off particles with a large size
and a shape strongly differing from spherical, we observed the predominant role of the non-sphericity of the scattering centers
in the signal depolarization.
Received: 6 December 2000 / Revised version: 11 July 2001 / Published online: 19 September 2001 |
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Keywords: | PACS: 42 68 Wt 42 68 Ge 42 68 Mj |
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