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scattering cross-section, σ scat

The scattering coefficient per particle (cm 2 particle);
b scat = n σ scat
where n is the number concentration of particles (particles cm −3) and σ scat is the scattering cross-section. b scat, the scattering component of extinction due to gas and particles, is measured in the atmosphere using a nephelometer. For a homogeneous atmosphere it is related in theory to the meteorological range (L V): L V = 3.9 b scat; b scat and b abs represent the scattering and absorption coefficients per unit length for a light beam (of path length L) which has a spectral radiance (intensity) I 0 incident on a sample of air and I is the transmitted spectral radiance (intensity), ln ( I 0 I ) = L ( b scat + b abs ).
Source:
PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2212
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.S05490.
Original PDF version: http://www.iupac.org/goldbook/S05490.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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