Abstract
Backscattering properties of ice crystal models (Voronoi aggregates (VA), hexagonal columns (COL), and six-branched bullet rosettes (BR6)) are calculated by using geometrical-opticsintegral-equation (GOIE) method. Characteristics of depolarization ratio ( δ ) and lidar ratio ( L ) of the crystal models are examined. δ ( L ) values are 0.2~0.3 (4~50), 0.3~0.4 (10~25), and 0.5~0.6 (50~100) for COL, BR6, and VA, respectively, at wavelength λ=0.532 μm. It is found that small deformation of COL model could produce significant changes in δ and L .
Highlights
Optical properties of nonspherical ice crystals influence the accuracy of retrieval of cirrus cloud information from remote sensing measurements
The depolarization ratio (δ) and lidar ratio (L) for VA, BR6, and COL models are examined to study a feasibility for applying theoretical calculations to lidar measurements
It is demonstrated that large numbers of random orientations (Nori) are necessary to calculate the radiation of backward direction accurately [3,4]
Summary
Optical properties of nonspherical ice crystals influence the accuracy of retrieval of cirrus cloud information from remote sensing measurements. Improvements in modeling of ice crystal shapes and numerical calculation schemes are of increasing importance. Optical properties of three kinds of crystal models of VA (irregular particles), COL and BR6 (regular particles) have been investigated from visible to infrared wavelength regions by using the finite-difference time-domain (FDTD) and the GOIE methods [1]. The depolarization ratio (δ) and lidar ratio (L) for VA, BR6, and COL models are examined to study a feasibility for applying theoretical calculations to lidar measurements
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