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

By Alexander A. Kokhanovsky

This new textual content deals skilled scholars a finished overview of accessible strategies for the distant sensing of aerosols. those small debris effect either atmospheric visibility and the thermodynamics of the ambience. also they are of serious value in any attention of weather switch difficulties. Aerosols can also be accountable for the lack of harvests, human illnesses and ecological mess ups. hence, this certain research of aerosol houses on an international scale couldn't be extra well timed.

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

Example text

It changes sign (opposite sense of rotation as compared to the incident beam) around the 125-degree scattering angle (blue color in Fig. 11(c)). The element f34 shown in Fig. 11(d) gives the linear-to-circular light polarization conversion strength (Kokhanovsky, 2003) by aerosol particles. It follows from this figure that the probability of such conversion is low (except the backscattering region, see blue color). 8 nm are given in Fig. 12. It follows from this figure that Mie theory can be successfully used for the theoretical interpretation of corresponding polarimetric experiments in the field of aerosol optics.

This absorption causes periodic heating and the subsequent expansion of the surrounding air at the modulation frequency (Pao, 1977). The practical use of the method is limited due to relatively low sensitivity and the use of inefficient light sources. However, important progress has been made in recent years to overcome the limitations of the technique (Lack, 2006). The diffuse transmittance method is based on the measurements of the diffuse transmitted flux. , 1999). Techniques based on the subtraction of scattering, for example, measured by a nephelometer, from extinction are valid only for the case of strong absorption.

It follows from Fig. 15(b) that the degree of circular polarization vanishes, for example, at 175 degrees for maritime aerosol. This, however, does not mean that the light becomes completely unpolarized. Apart from the depolarization, a process of circular-to-linear polarization conversion takes place at this angle. Chapter 3. 1 Radiative transfer equation The average sizes of most aerosol particles are of the order of the visible light wavelength. This means that optical methods are very suitable for studies of atmospheric aerosol.

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