Read e-book online Aerosol Optics: Light Absorption and Scattering by Particles PDF

By Alexander A. Kokhanovsky

ISBN-10: 3540237348

ISBN-13: 9783540237341

This new textual content deals skilled scholars a finished evaluate of accessible strategies for the distant sensing of aerosols. those small debris impression either atmospheric visibility and the thermodynamics of the ambience. also they are of serious significance in any attention of weather swap difficulties. Aerosols can also be liable for the lack of harvests, human illnesses and ecological mess ups. hence, this specific examine of aerosol homes on a world scale couldn't be extra timely.

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Extra resources for Aerosol Optics: Light Absorption and Scattering by Particles in the Atmosphere (Springer Praxis Books / Environmental Sciences)

Example text

The white color in Fig. 11(a) corresponds to values of the phase function larger than one. This is mostly the case for forward-scattering region. The degree of polarization is quite low (green color in Fig. 11(b)) except in the vicinity of the backscattering direction, where Pl switches the sign depending on x, and also at the rainbow region (around h $ 100 Þ, where the area of high positive polarization is located. One concludes from Fig. 11(c) that the degree of polarization of incident circularly polarized light is hardly changed in the forward direction.

01 for remote clean areas. The primary absorber of light in the atmosphere is soot (Horvath, 1993). Therefore, the probability of photon absorption b ¼ kabs =kext differs from zero substantially only if soot is present in great amount. This is usually the case for urban areas. The value of the absorption coefficient of aerosol is of importance for climate change problems. It determines the cooling or warming effect of aerosol above a scene with a given ground albedo. Therefore, considerable efforts have been undertaken to characterize the spatial distribution of kabs and also of single-scattering albedo x0 ¼ 1 À b.

008. 3 Absorption 29 Fig. 4(b). 008. due to the nonsphericity of the resulting particle. There are indications (Berry and Percival, 1986) that aggregation will increase the absorption cross-section of a particle as compared to the case of the sum of cross-sections of isolated soot grains. Such an enhancement also occurs if soot grains are incorporated inside large nonabsorbing particles. This is due to the focusing effect of a nonabsorbing aerosol particle or a fog droplet. This means that the density of electromagnetic radiation increases inside the particle as compared to the free space.

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Aerosol Optics: Light Absorption and Scattering by Particles in the Atmosphere (Springer Praxis Books / Environmental Sciences) by Alexander A. Kokhanovsky


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