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

By Alexander A. Kokhanovsky

In Aerosol Optics, Alexander Kokhanovsky presents a finished overview of obtainable concepts for the distant sensing of aerosols. even supposing often satellite tv for pc distant sensing is taken into account, ground-based suggestions also are mentioned. The paintings is based at the sturdy foundation of radiative move concept, coupled with Maxwell idea for the calculation of the scattering homes of small debris. specifically, the writer describes ideas for the decision of the column focus of aerosol debris and their optical sizing utilizing spaceborne optical instrumentation. nearly all of the innovations defined during this booklet use a so-called "library method". this technique depends the precalculated top-of-atmosphere reflectances (TOAR) for vaious atmospheric aerosol kinds. The comparability of measured and calculated TOARS permits one to signify the optically-equivalent aerosol state.

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Extra resources for Aerosol Optics: Light Absorption and Scattering by Particles in the Atmosphere

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The same as in Fig. 9 except for f33 . , 1976). 2 is given in Fig. 14(a). 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.

Za2 kext ðkÞ ¼ N pa2 Qext ða; kÞf ðaÞ da a1 with respect to unknown function f ðaÞ: For these special inversion techniques are applied (Twomey, 1977; Shifrin, 2003). Clearly, the inversion is not possible, if Qext ¼ 2, which is a valid assumption for very large particles with a ) k as, for instance, in the case of desert dust outbreaks. Then it follows that kext ¼ 2NS independently of the shape, size distribution, and internal structure of particles. Here S is the average projection area of particles on the plane perpendicular to the incident beam.

5. 008i. there. Hence, the absorption efficiency factor decreases with n for large, strongly absorbing particles. 4 Scattering The theoretical description of light scattering by atmospheric aerosol is much more complex as compared to absorption and extinction. This is related to the fact that it is not enough just to have information on the aerosol scattering coefficient ksca ¼ N C sca , which is close to kext for atmospheric aerosol in most cases; it also is of importance to understand the angular distribution of scattered energy for a given local volume of an aerosol medium.

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