Solar glint from oriented crystals in cirrus clouds

Claire Lavigne; Antoine Roblin; Patrick Chervet

doi:10.1364/AO.47.006266

Applied Optics
Vol. 47,
Issue 33,
pp. 6266-6276
(2008)
•https://doi.org/10.1364/AO.47.006266

Solar glint from oriented crystals in cirrus clouds

Claire Lavigne, Antoine Roblin, and Patrick Chervet

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Claire Lavigne, Antoine Roblin, and Patrick Chervet, "Solar glint from oriented crystals in cirrus clouds," Appl. Opt. 47, 6266-6276 (2008)

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Abstract

Solar scattering on oriented cirrus crystals near the specular reflection direction is modeled using a mix method combining geometric optics and diffraction effects at three wavelengths in the visible and infrared domains. Different potential sources of phase function broadening around the specular direction, such as multiple scattering, solar disk, or tilt effects, are studied by means of a Monte Carlo method. The radiance detected by an airborne sensor located a few kilometers above the cirrus cloud and pointing in the specular scattering direction is calculated at four solar zenith angles showing a dramatic increase of the signal in relation to the usual assumption of random crystal orientation.

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Solar Zenith Angle $θ_{i}$ $(°)$ )	$λ = 0.55 μm$	$λ = 3.7 μm$	$λ = 5 μm$
10	191	14.1	6.9
30	155	13.6	6.5
50	171	13.5	6.7
70	255	16.6	9.1

Solar Zenith Angle $θ_{i}$ $(°)$	$λ = 0.55 μm$	$λ = 3.7 μm$	$λ = 5 μm$
10	0.50	0.75	0.82
30	0.50	0.75	0.86
50	0.50	0.85	0.98
70	0.55	1.20	1.46

Wavelength ( $μm$ )	Solar Zenith Angle $(°)$	Solar Scattered Radiance for Oriented Crystals ( $W {sr}^{- 1} {cm}^{- 2} cm$ )	Solar Scattered Radiance for Non- oriented Crystals ( $W {sr}^{- 1} {cm}^{- 2} cm$ )	Thermal Radiance ( $W {sr}^{- 1} {cm}^{- 2} cm$ )
0.55	10	$7 \times 10^{- 7}$	$7 \times 10^{- 9}$	0
	30	$9 \times 10^{- 7}$	$6 \times 10^{- 9}$	0
	50	$2 \times 10^{- 6}$	$7 \times 10^{- 9}$	0
	70	$1 \times 10^{- 5}$	$3 \times 10^{- 8}$	0
3.7	10	$2 \times 10^{- 8}$	$2 \times 10^{- 11}$	$2 \times 10^{- 11}$
	30	$3 \times 10^{- 8}$	$1 \times 10^{- 11}$	$2 \times 10^{- 11}$
	50	$5 \times 10^{- 8}$	$2 \times 10^{- 11}$	$2 \times 10^{- 11}$
	70	$2 \times 10^{- 7}$	$2 \times 10^{- 10}$	$3 \times 10^{- 11}$
5.0	10	$4 \times 10^{- 9}$	$6 \times 10^{- 12}$	$3 \times 10^{- 10}$
	30	$6 \times 10^{- 9}$	$5 \times 10^{- 12}$	$3 \times 10^{- 10}$
	50	$1 \times 10^{- 8}$	$8 \times 10^{- 12}$	$3 \times 10^{- 10}$
	70	$7 \times 10^{- 8}$	$9 \times 10^{- 11}$	$5 \times 10^{- 10}$

Solar Zenith Angle $θ_{i}$ $(°)$ )	$λ = 0.55 μm$	$λ = 3.7 μm$	$λ = 5 μm$
10	191	14.1	6.9
30	155	13.6	6.5
50	171	13.5	6.7
70	255	16.6	9.1

Solar Zenith Angle $θ_{i}$ $(°)$	$λ = 0.55 μm$	$λ = 3.7 μm$	$λ = 5 μm$
10	0.50	0.75	0.82
30	0.50	0.75	0.86
50	0.50	0.85	0.98
70	0.55	1.20	1.46

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