TY - JOUR
T1 - Light scattering by ice crystals of cirrus clouds
T2 - From exact numerical methods to physical-optics approximation
AU - Konoshonkin, Alexander
AU - Borovoi, Anatoli
AU - Kustova, Natalia
AU - Okamoto, Hajime
AU - Ishimoto, Hiroshi
AU - Grynko, Yevgen
AU - Förstner, Jens
N1 - Funding Information:
Russian Foundation for Basic Research (15-05-06100, 15-55-53081, 16-35-60089); Russian Science Foundation (14-27-00022) in the development of the computer code used for calculations in Section 4; Collaboration Research Program of the Research Institute for Applied Mechanics, Kyushu University (no. 10, 2014; no. 8, 2015); JSPS Kakenhi Grant (25247078).
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/7/1
Y1 - 2017/7/1
N2 - The problem of light scattering by ice crystals of cirrus clouds is considered in the case of a hexagonal ice plate with different distributions over crystal orientations. The physical-optics approximation based on (E, M)-diffraction theory is compared with two exact numerical methods: the finite difference time domain (FDTD) and the discontinuous Galerkin time domain (DGTD) in order to estimate its accuracy and limits of applicability. It is shown that the accuracy of the physical-optics approximation is estimated as 95% for the averaged backscattering Mueller matrix for particles with size parameter more than 120. Furthermore, the simple expression that allows one to estimate the minimal number of particle orientations required for appropriate spatial averaging has been derived.
AB - The problem of light scattering by ice crystals of cirrus clouds is considered in the case of a hexagonal ice plate with different distributions over crystal orientations. The physical-optics approximation based on (E, M)-diffraction theory is compared with two exact numerical methods: the finite difference time domain (FDTD) and the discontinuous Galerkin time domain (DGTD) in order to estimate its accuracy and limits of applicability. It is shown that the accuracy of the physical-optics approximation is estimated as 95% for the averaged backscattering Mueller matrix for particles with size parameter more than 120. Furthermore, the simple expression that allows one to estimate the minimal number of particle orientations required for appropriate spatial averaging has been derived.
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U2 - 10.1016/j.jqsrt.2016.12.024
DO - 10.1016/j.jqsrt.2016.12.024
M3 - Article
AN - SCOPUS:85008156645
VL - 195
SP - 132
EP - 140
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
SN - 0022-4073
ER -