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

By Alexander A. Kokhanovsky

In Aerosol Optics, Alexander Kokhanovsky offers a complete assessment of accessible recommendations for the distant sensing of aerosols. even though generally satellite tv for pc distant sensing is taken into account, ground-based suggestions also are mentioned. The paintings is based at the stable foundation of radiative move thought, coupled with Maxwell thought for the calculation of the scattering homes of small debris. particularly, the writer describes ideas for the choice of the column focus of aerosol debris and their optical sizing utilizing spaceborne optical instrumentation. nearly all of the recommendations 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 resources for Aerosol Optics: Light Absorption and Scattering by Particles in the Atmosphere

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3(b). 0. 005i is assumed. 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.

Therefore, locations with small fractions of soot in atmospheric air are characterized by smaller light absorption levels. Polarimetric techniques use an approach similar to that just described. , 1998; Kokhanovsky, 2003). The technique is highly sensitive to the refractive index of atmospheric aerosol. However, the retrievals are model-dependent and usually performed for the case of spherical scatterers. It is known that the polarization characteristics are highly influenced not only by the size and refractive index of particles but also by their shape and internal structure.

It is much more difficult to measure the atmospheric aerosol absorption kabs ¼ kext À ksca as compared to the aerosol extinction. This is mostly due to the fact that the amount of energy absorbed by aerosols is much smaller as compared to the light scattered energy. html). The most frequently used techniques are: * filter methods; * optical acoustic spectrometry; 24 * * * * 2 Optical properties of atmospheric aerosol the diffuse transmittance method; techniques based on the measurement of differences between light extinction and scattering for a given atmospheric volume; the radiative transfer retrieval approach based on the measurements of the aerosol optical thickness, small-angle scattering, and diffuse light transmission by a sun photometer; polarimetric techniques.

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