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

By Alexander A. Kokhanovsky

In Aerosol Optics, Alexander Kokhanovsky offers a entire assessment of obtainable thoughts for the distant sensing of aerosols. even supposing typically satellite tv for pc distant sensing is taken into account, ground-based options also are mentioned. The paintings is based at the strong foundation of radiative move idea, coupled with Maxwell idea for the calculation of the scattering houses of small debris. particularly, the writer describes suggestions for the selection of the column focus of aerosol debris and their optical sizing utilizing spaceborne optical instrumentation. nearly all of the recommendations defined during this ebook use a so-called "library method". this system depends the precalculated top-of-atmosphere reflectances (TOAR) for vaious atmospheric aerosol forms. The comparability of measured and calculated TOARS permits one to signify the optically-equivalent aerosol state.

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Example text

It follows that the value of P is larger for fine mode aerosols and also for soot, which shows a polarization curve similar to that for molecular scattering, which is given by sin2 h=ð1 þ cos2 hÞ. The polarization curves given in Fig. 14(a) are very different and, therefore, they can be used for the identification of the predominant aerosol type. Elements f33 and f34 are shown in Figs. 14(b) and (c), respectively. 0 0 20 40 60 80 100 120 scattering angle, degrees Fig. 14(c). The same as in Fig.

The physical meaning of this equation is quite simple: the change in the light intensity (the derivative) in the direction ~ n at the point with the radius-vector ~ r is due to the extinction (Àkext It Þ and scattering (the integral)/emission (B0 Þ processes. The phase funcn 0 to the direction tion pð~ n; ~ n 0 Þ describes the strength of light scattering from the direction ~ ~ n by a local volume of an aerosol medium and the corresponding integral accounts for the total contribution of the scattered light from all directions to the direction ~ n at the point with the radius-vector ~ r.

For simplicity, we assume that there are no thermal sources of radiation in the medium. Then the main equation of the theory can be written in the following form (Sobolev, 1975): dIt ðs; W; fÞ ¼ ÀIt ðs; W; fÞ þ Bt ðs; W; fÞ; cos W ds where Zp Z2p x0 0 df It ðs; W0 ; f0 Þpðh0 Þ sin W0 dW0 Bt ðs; W; fÞ ¼ 4p 0 0 50 3 Multiple light scattering in aerosol media is the source function and It ðs; W; fÞ is the total light intensity at the optical thickness s in the direction (W; fÞ. The complication arises due to the fact that Bt depends on the light intensity It.

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