Radiative transfer codes for atmospheric correction and aerosol retrieval: intercomparison study

Svetlana Y. Kotchenova; Eric F. Vermote; Robert Levy; Alexei Lyapustin

doi:10.1364/AO.47.002215

Applied Optics
Vol. 47,
Issue 13,
pp. 2215-2226
(2008)
•https://doi.org/10.1364/AO.47.002215

Radiative transfer codes for atmospheric correction and aerosol retrieval: intercomparison study

Svetlana Y. Kotchenova, Eric F. Vermote, Robert Levy, and Alexei Lyapustin

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Svetlana Y. Kotchenova, Eric F. Vermote, Robert Levy, and Alexei Lyapustin, "Radiative transfer codes for atmospheric correction and aerosol retrieval: intercomparison study," Appl. Opt. 47, 2215-2226 (2008)

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Abstract

Results are summarized for a scientific project devoted to the comparison of four atmospheric radiative transfer codes incorporated into different satellite data processing algorithms, namely, 6SV1.1 (second simulation of a satellite signal in the solar spectrum, vector, version 1.1), RT3 (radiative transfer), MODTRAN (moderate resolution atmospheric transmittance and radiance code), and SHARM (spherical harmonics). The performance of the codes is tested against well-known benchmarks, such as Coulson’s tabulated values and a Monte Carlo code. The influence of revealed differences on aerosol optical thickness and surface reflectance retrieval is estimated theoretically by using a simple mathematical approach. All information about the project can be found at http://rtcodes.ltdri.org.

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	$τ_{mol} (λ, nm)$
Condition	0.1 (530)		0.25 (440)		0.5 (360)
$ρ_{surf}$	0.0	0.25	0.0	0.25	0.0	0.25
SZA, deg	23.0739	0.0	0.0	23.0739	23.0739	0.0
	53.1301	36.8699	36.8699	53.1301	53.1301	36.8699
	78.4630	66.4218	66.4218	78.4630	78.4630	66.4218

	Model
Parameter	Urban–Industrial and Mixed	Biomass Burning	Biomass Burning
Location	GSFC, Greenbelt, Md. (1993–2000)	Amazonian forest, Brazil (1993–1994), Bolivia (1998–1999)	African savanna, Zambia (1995–2000)
Range of $τ_{aer}$	$0.1 \leq τ (440) \leq 1.0$	$0.1 \leq τ (440) \leq 3.0$	$0.1 \leq τ (440) \leq 1.5$
Values of $τ_{aer}$ selected for this study	0.2; 0.8	0.2; 0.8; 2.0	0.2; 0.8
Refractive index: real part; imaginary part	$1.41 - 0.03 τ (440); 0.003$	1.47; 0.0093	1.51; 0.021
SSA at $λ = 412, 440, 670 nm$	$0.97, 0.98, 0.97$	$0.94, 0.94, 0.93$	$0.88, 0.88, 0.84$
$r_{Vf}, μm$	$0.12 + 0.11 τ (440)$	$0.14 + 0.013 τ (440)$	$0.12 + 0.025 τ (440)$
$σ_{f}, μm$	0.38	0.40	0.40
$r_{Vc}, μm$	$3.03 + 0.49 τ (440)$	$3.27 + 0.58 τ (440)$	$3.22 + 0.71 τ (440)$
$σ_{c}, μm$	0.75	0.79	0.73
$C_{Vf}, {μm}^{3} / {μm}^{2}$	$0.15 τ (440)$	$0.12 τ (440)$	$0.12 τ (440)$
$C_{Vc}, {μm}^{3} / {μm}^{2}$	$0.01 + 0.04 τ (440)$	$0.05 τ (440)$	$0.09 τ (440)$

VZA, deg
$τ_{aer} = 0.2$	$τ_{aer} = 0.8$	$τ_{aer} = 2.0$	SZA, deg	AZ, deg
As in Coulson’s tables	From $5.0 °$ to $80.0 °$ with a step of $5 °$	From $3.0 °$ to $70.0 °$ with a step of $5 °$	$0.0 °$	$0.0 °$
			$10.0 °$	$90.0 °$
			$23.0709 °$	$180.0 °$
			$45.0 °$
			$58.6677 °$
			$75.0 °$

	$τ_{mol} (λ, nm)$
Condition	0.1 (530)		0.25 (440)		0.5 (360)
$ρ_{surf}$	0.0	0.25	0.0	0.25	0.0	0.25
SZA, deg	23.0739	0.0	0.0	23.0739	23.0739	0.0
	53.1301	36.8699	36.8699	53.1301	53.1301	36.8699
	78.4630	66.4218	66.4218	78.4630	78.4630	66.4218

	Model
Parameter	Urban–Industrial and Mixed	Biomass Burning	Biomass Burning
Location	GSFC, Greenbelt, Md. (1993–2000)	Amazonian forest, Brazil (1993–1994), Bolivia (1998–1999)	African savanna, Zambia (1995–2000)
Range of $τ_{aer}$	$0.1 \leq τ (440) \leq 1.0$	$0.1 \leq τ (440) \leq 3.0$	$0.1 \leq τ (440) \leq 1.5$
Values of $τ_{aer}$ selected for this study	0.2; 0.8	0.2; 0.8; 2.0	0.2; 0.8
Refractive index: real part; imaginary part	$1.41 - 0.03 τ (440); 0.003$	1.47; 0.0093	1.51; 0.021
SSA at $λ = 412, 440, 670 nm$	$0.97, 0.98, 0.97$	$0.94, 0.94, 0.93$	$0.88, 0.88, 0.84$
$r_{Vf}, μm$	$0.12 + 0.11 τ (440)$	$0.14 + 0.013 τ (440)$	$0.12 + 0.025 τ (440)$
$σ_{f}, μm$	0.38	0.40	0.40
$r_{Vc}, μm$	$3.03 + 0.49 τ (440)$	$3.27 + 0.58 τ (440)$	$3.22 + 0.71 τ (440)$
$σ_{c}, μm$	0.75	0.79	0.73
$C_{Vf}, {μm}^{3} / {μm}^{2}$	$0.15 τ (440)$	$0.12 τ (440)$	$0.12 τ (440)$
$C_{Vc}, {μm}^{3} / {μm}^{2}$	$0.01 + 0.04 τ (440)$	$0.05 τ (440)$	$0.09 τ (440)$

Radiative transfer codes for atmospheric correction and aerosol retrieval: intercomparison study

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Tables (3)

Equations (9)

Applied Optics