Influence of Multiple Scattering of the Intensity and Polarization of Diffuse Sky Radiation

Bary, E. de

doi:10.1364/ao.3.001293

Cited by 37 publications

(6 citation statements)

References 2 publications

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“…de Bary (1963) developed an approximation method including aerosol scattering which, in spite of truncations, yielded a better agreement between computed and measured values. de Bary's approximation method was verified with the help of computation recently carried out by Eschelbach (1971).…”

Section: Introductionmentioning

confidence: 72%

The ratio of primary scattering to total scattering of sky radiance

Bary¹,

Eschelbach²

1974

Tellus

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Recently Eschelbach has computed from theory spectral radiance values for a turbid atmosphere taking into account the effect of multiple scattering. In the present work these computational data were used to investigate the ratio of primary to total scattering. This quotient is a measure of multiple scattering because of the relation: Total Scattering (TS) is equal to Primary Scattering (PS) plus Multiple Scattering (MS), i.e. PS/TS = 100 ‐ MS/TS (%). It is discussed in which way multiple scattering in the solar almucantar depends on the solar elevation, turbidity, scattering angle, wavelength and albedo. The present work shows in which way multiple scattering is related to the optical thickness, i.e. the extinction. The accuracy of this relation lies within the tolerance of radiance measurements. The relationship found enables one to simplify a comparison between the results from experimental measurements and those from computational models, at least for primary scattering. This is advantageous insofar as numerous computational models for primary scattering are readily available. Furthermore, measurements taken at a fixed solar elevation, namely Hμ = 24°, were used to investigate in which way multiple scattering depends on the wavelength and the scattering angle as a function of 3 different turbidity coefficients and 2 different values of the albedo. This was done with and without accounting for aerosol absorption in the sun's vertical and in the solar almucantar. One series of measurements of the sky radiance and the total extinction was used as an example to evaluate the above‐described method. The values compare satisfactorily with the model computations. We can show that our newly developed method enables one to draw conclusions on aerosol absorption.

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Section: Introductionmentioning

confidence: 72%

The ratio of primary scattering to total scattering of sky radiance

Bary¹,

Eschelbach²

1974

Tellus

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“…[159][160][161][162] The equation of radiative transfer is separated in azimuth and the integrals replaced by sums. [167][168][169][170][171] The intensity is expressed as aseries developed for the number of seattering proeesses to be eonsidered. [163][164][165][166] The atmosphere is divided into layers and the unit sphere into a set of solid angle inerements.…”

Section: Monte Carlo Methodsmentioning

confidence: 99%

The Natural Environment and the Biogeochemical Cycles

Bolle

Fukai

Leeuw

et al. 1982

The Handbook of Environmental Chemistry

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“…This restriction has tended to limit the angular extent of polarization studies, which often are confined to the Sun-zenith ͑or principal͒ plane or to the zenith itself. 7,10 Thus, in the past, skylight polarization was analyzed outside the principal plane only occasionally. 11,12 Yet now we can routinely measure polarization almost anywhere in the sky hemisphere by using digital imaging techniques-in my case, digitized color slides.…”

Section: Introductionmentioning

confidence: 99%

Digital imaging of clear-sky polarization

Lee

1998

Appl. Opt.

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If digital images of clear daytime or twilight skies are acquired through a linear polarizing filter, they can be combined to produce high-resolution maps of skylight polarization. Here polarization P and normalized Stokes parameter Q are measured near sunset at one inland and two coastal sites. Maps that include the principal plane consistently show that the familiar Arago and Babinet neutral points are part of broader areas in which skylight polarization is often indistinguishably different from zero. A simple multiple-scattering model helps explain some of these polarization patterns.

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Influence of Multiple Scattering of the Intensity and Polarization of Diffuse Sky Radiation

Cited by 37 publications

References 2 publications

The ratio of primary scattering to total scattering of sky radiance

The ratio of primary scattering to total scattering of sky radiance

The Natural Environment and the Biogeochemical Cycles

Digital imaging of clear-sky polarization

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