Uncertainties in the evaluation of the shortwave radiative properties of an aerosol layer due to experimental and numerical errors

M. B. Baker; A. Coletti

doi:10.1364/AO.21.002244

Applied Optics
Vol. 21,
Issue 12,
pp. 2244-2252
(1982)
•https://doi.org/10.1364/AO.21.002244

Uncertainties in the evaluation of the shortwave radiative properties of an aerosol layer due to experimental and numerical errors

M. B. Baker and A. Coletti

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M. B. Baker and A. Coletti, "Uncertainties in the evaluation of the shortwave radiative properties of an aerosol layer due to experimental and numerical errors," Appl. Opt. 21, 2244-2252 (1982)

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Abstract

Estimates of the radiative effects of tropospheric aerosol layers require analysis of complex and to some extent indirect measurements. Each step in the measurement and analysis procedure contributes uncertainty to the final estimated values. The magnitudes of the resulting uncertainties in reflectivity, transmissivity, and absorptivity for a specific realistic experiment are estimated as functions of solar altitude and mean optical properties in the aerosol layer, assuming uniformity in the layer and sphericity of the particles. These values are typically ∼2–8% for a narrow wavelength interval in the visible.

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Equations (11)

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Channel no.	Wavelength interval (nm)	Irradiance (μw cm⁻² nm⁻¹)
1	380–1080	≃596 × 10²μW cm⁻²^b
2	530–1080	≃469 × 10²μW cm⁻²
3	630–1080	≃383 × 10 μW cm⁻²
4	700–1080	≃329 × 10²μW cm⁻²
5	375–385	35.5
6	495–505	118.1
7	670–680	118.9
8	815–1065	21.7
9	1055–1056	54.8
10	1220–1240	44.2
11	585–595	118.9
12	845–855	86.6
13	1625–1645	35.1
14	340–400	18.6

Variable	Instrument used	Kind of measurement	Kind of error assumed
$\tilde{ω}$	Polar nephelometer	Indirect	Relative 10%
τ	Sunphotometer	Direct	Absolute 0.02
g	Polar nephelometer	Direct	Relative 5%
A	Double pyranometer	Direct	Relative 5%

Channel no.	Wavelength interval (nm)	Irradiance (μw cm⁻² nm⁻¹)
1	380–1080	≃596 × 10²μW cm⁻²^b
2	530–1080	≃469 × 10²μW cm⁻²
3	630–1080	≃383 × 10 μW cm⁻²
4	700–1080	≃329 × 10²μW cm⁻²
5	375–385	35.5
6	495–505	118.1
7	670–680	118.9
8	815–1065	21.7
9	1055–1056	54.8
10	1220–1240	44.2
11	585–595	118.9
12	845–855	86.6
13	1625–1645	35.1
14	340–400	18.6

Variable	Instrument used	Kind of measurement	Kind of error assumed
$\tilde{ω}$	Polar nephelometer	Indirect	Relative 10%
τ	Sunphotometer	Direct	Absolute 0.02
g	Polar nephelometer	Direct	Relative 5%
A	Double pyranometer	Direct	Relative 5%

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Figures (5)

Tables (2)

Equations (11)

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