Get Aerosol Optics: Light Absorption and Scattering by Particles PDF

By Alexander A. Kokhanovsky

ISBN-10: 3540237348

ISBN-13: 9783540237341

This new textual content deals skilled scholars a entire assessment of accessible suggestions for the distant sensing of aerosols. those small debris effect either atmospheric visibility and the thermodynamics of the ambience. also they are of serious significance in any attention of weather switch difficulties. Aerosols can also be accountable for the lack of harvests, human illnesses and ecological failures. hence, this certain examine of aerosol houses on a world scale couldn't be extra timely.

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

Sample text

The largest possible value of a is close to 4. This takes place for a purely molecular atmosphere with scatterers having sizes a ( k . The values of a ¼ 3 and above can be found in laboratory measurements. However, they are not characteristic for in situ atmospheric measurements. The extinction coefficient depends not only on the size of particles but also on their concentrations. 5 kmÀ1 at 550 nm at urban locations (Horvath and Trier, 1993) and much lower for clean rural and remote oceanic regions.

We present the values of the phase function P11 ðhÞ, the degree of polarization Pl ¼ Àf12 , and also f33 ¼ f44 , f34 ¼ Àf43 in Fig. 11. Calculations have been performed at n ¼ 1:53 À 0:008i for various sizes of spherical monodispersed particles ðx 2 ½0:01; 100ŠÞ. One concludes that values of the phase function are quite small in the range of scattering angles 90–150 degrees, with some increase and also larger variability depending on the size in the backscattering region. The white color in Fig.

Also it follows that the behavior of scattering matrix elements differs for continental and maritime aerosol considerably (especially, in the backward hemisphere). This can be used, for example, for the identification of the aerosol type. 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.

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Aerosol Optics: Light Absorption and Scattering by Particles in the Atmosphere (Springer Praxis Books / Environmental Sciences) by Alexander A. Kokhanovsky


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