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

By Alexander A. Kokhanovsky

This new textual content deals skilled scholars a accomplished overview of obtainable thoughts for the distant sensing of aerosols. those small debris impact either atmospheric visibility and the thermodynamics of the ambience. also they are of serious value in any attention of weather swap difficulties. Aerosols can also be chargeable for the lack of harvests, human illnesses and ecological mess ups. therefore, this unique research of aerosol houses on an international scale couldn't be extra timely.

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

Sample text

The HG phase function or linear combinations of these functions with different values of the asymmetry parameter g are used frequently for studies of radiative propagation in the aerosol media. It is difficult to calculate the phase function using the electromagnetic theory for a particle of an arbitrary shape and, even if it can be done for a single particle, the problem of corresponding averaging with respect to the shapes, orientations, and sizes of particles in the local volume remains. This prompts the use of the simplified Heney– Greenstein phase functions in corresponding mathematical modeling of radiative transfer in aerosol media with nonspherical particles.

The only difference will be that constants x0 and s0 and also the function pðhÞ are determined by physical laws different from those underlying light scattering by aerosol particles. This multidisciplinary nature of the radiative transfer theory and its applicability to a great range of physical problems is the most important underlying reason for great developments in the field achieved in the 20th century with contributions from scientists working in very diverse research fields. 2 The diffuse light intensity It is of advantage to represent the total light intensity in the following form:   s ~ÀX ~ 0 Þ þ I ðs; W; fÞ It ðs; W; fÞ ¼ pI0 exp À dðX cos W0 where pI0 is the incident radiative flux per unit area normal to the beam.

The expression for the phase function given above can be used for the calculation of the asymmetry parameter. It follows after correspondent analytical integration (van de Hulst, 1957) that ! 1 À Á À Á 4 X nð n þ 2Þ 2n þ 1 Re an a*nþ1 þ bn b*nþ1 þ Re an b*n : g¼ 2 x Qsca n¼1 n þ 1 nð n þ 1 Þ The plots of g calculated using this equation in the same range of n and x as in Fig. 1 except at v ¼ 0; 0:008 are given in Fig. 8. It follows that generally g increases both with the size of particles and with absorption.

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