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

By Alexander A. Kokhanovsky

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

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

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Here x0 ¼ ksca =kext is the single scattering albedo, pðhÞ is the phase function, s ¼ kext z is the optical depth, z is the vertical coordinate (see Fig. 1 for the definition of the coordinate system), W is the observation angle, and f is the azimuth. The phase function pðhÞ describes the conditional probability of light scattering from the direction specified by the pair ðW0 ; f0 Þ to the direction ðW; fÞ. One can derive, using spherical trigonometry: cos h0 ¼ cos W cos W0 þ sin W sin W0 cosðf À f0 Þ: Therefore, the physical problem of light diffusion in an aerosol medium is reduced to the solution of the integro-differential equation given above for a priori known values of x0 and the phase function pðhÞ.

The second term represents the so-called diffuse light intensity function dðX I ðs; W; fÞ. Therefore, the equation given above enables the separation of the total intensity into two components: the diffuse light intensity, which is a slow changing function of angles, and a very peaked angular function describing the direct attenuated light beam. Such a separation enables the simplification of corresponding numerical procedures for the calculation of light fields in aerosol media as compared to the direct calculation of the total intensity It ðs; W; fÞ.

Single-scattering albedo calculated for the same conditions as in Fig. 4(a) is presented in Fig. 4(b). It follows that single-scattering albedo generally increases with the size of particles. Often approximate relations for the local optical parameters of an aerosol medium are used. They make it possible to avoid tedious numerical calculations and to make quick estimates of corresponding optical parameters. Introducing the volumetric concentration of particles, c ¼ N V ; one derives for absorbing particles with radii much smaller than the wavelength: kabs ðkÞ ¼ cDðnÞaðkÞ: This expression differs from that for homogeneous media without scattering due to the presence of the coefficient D: This coefficient (see above) is equal to one at n ¼ 1, as it should be.

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