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

By Alexander A. Kokhanovsky

This new textual content bargains skilled scholars a complete assessment of obtainable concepts for the distant sensing of aerosols. those small debris impact either atmospheric visibility and the thermodynamics of the ambience. also they are of significant significance in any attention of weather swap difficulties. Aerosols can also be accountable for the lack of harvests, human illnesses and ecological mess ups. hence, this particular learn of aerosol homes on an international scale couldn't be extra well timed.

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

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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. 11(a) corresponds to values of the phase function larger than one. This is mostly the case for forward-scattering region. The degree of polarization is quite low (green color in Fig.

Therefore, f34 shows the linear-to-circular polarized light conversion efficiency. Usually, such a conversion has a low efficiency with jPc j smaller than 30 % in the forward hemisphere (see Fig. 14(c)). 8 at the scattering angle 142 degrees, for example, in the vicinity of the angular range, where the rainbow occurs. Maxima of jPc j shown in Fig. 14(c) for oceanic and coarse aerosol modes are shifted with respect to each other due to the different values of the real part of the refractive index of soil and oceanic aerosols.

The absorption coefficient of air with inclusions of absorbing spherical particles characterized by the size distribution f ðaÞ can be calculated using Mie theory. 1. 3 Absorption 27 where Qabs is the absorption efficiency factor. The value of Qabs depends on the spectral refractive index of aerosol particles and also on the size parameter x ¼ 2pa=k . The corresponding theoretical dependence is quite complicated (van de Hulst, 1957). Namely, it follows that Qabs ¼ Qext À Qsca ; where, according to Mie theory, Qext ¼ 1 2X ð2n þ 1Þ Reðan þ bn Þ; x2 n¼1 Qsca ¼ 1 h i 2X ð2n þ 1Þ jan j2 þjbn j2 : 2 x n¼1 Here, an ¼ w0n ð yÞwn ð xÞ À mwn ð yÞw0n ð xÞ ; w0n ð yÞnn ð xÞ À mwn ð yÞn0n ð xÞ bn ¼ mw0n ð yÞwn ð xÞ À wn ð yÞw0n ð xÞ ; mw0n ð yÞnn ð xÞ À wn ð yÞn0n ð xÞ m ¼ n À iv is the relative refractive index of a particle (m ¼ mp =mh , mp and mk are the refractive indices of a particle and a host medium respectively), y ¼ mx, 2pa x¼ , a is the radius of a particle, k is the incident wavelength in a host nonabsorbing rffiffiffiffiffi rffiffiffiffiffi k px px ð2Þ ð2Þ medium, wn ð xÞ ¼ ð xÞ; Jnþð1=2Þ Þ and Hnþð1=2Þ are Jðnþ1=2Þ ð xÞ; nn ð xÞ ¼ H 2 2 nþð1=2Þ Bessel and Hankel functions.

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