Pollution

Aerosol Optics: Light Absorption and Scattering by Particles by Alexander A. Kokhanovsky

By Alexander A. Kokhanovsky

This new textual content deals skilled scholars a finished evaluation of accessible recommendations for the distant sensing of aerosols. those small debris effect either atmospheric visibility and the thermodynamics of the ambience. also they are of serious significance in any attention of weather switch difficulties. Aerosols can also be chargeable for the lack of harvests, human illnesses and ecological mess ups. therefore, this certain examine of aerosol homes on an international scale couldn't be extra well timed.

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

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8 nm. , 2001). 44 2 Optical properties of atmospheric aerosol Fig. 13. Experimentally measured phase function and normalized phase matrix elements of atmospheric haze (solid lines) at 550 nm. , 1976). 35, respectively). The good fit of the angular functions DðhÞ can be achieved assuming the scattering coefficient ksca ¼ 1:5 kmÀ1 for the measurements at the left part of the figure and ksca ¼ 1:7 kmÀ1 at the right part of the figure. One can see that the fit of measurements by Mie theory is better in Fig.

However, the sense of rotation is opposite to that in the incident beam. The value of Pc vanishes at some scattering angles depending on the aerosol model (see Fig. 14(b)). This feature can be used for the identification of the aerosol type. In particular, the value of Pc for oceanic aerosol undergoes rapid changes at scattering angles larger than 160 degrees. The value of f34 (see Fig. 14(c)) can be also interpreted as the degree of circular polarization of scattered light for incident linearly polarized light (with the azimuth À45 degrees).

In a similar way one can make an interpretation of the upward propagated intensity. Therefore, if the source function is known, the calculation of the diffuse intensity is straightforward. It is just reduced to the calculation of integrals from known functions, which can be done either analytically or numerically. This solves the mathematical problem at hand in a complete way. However, the trouble is that the derivation of the source function is by itself a complicated problem. For instance, one can obtain the following equation for the source function substituting I in the definition of B given above by just derived integrals.

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