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Proceedings Paper

Modified Gamma Aerosol Model For The Marine Environment
Author(s): Herbert G. Hughes
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Paper Abstract

A statistical set of aerosols size distributions obtained by aircraft near San Nicolas Island are used to determine two of the constants of a Deirmendjian modified gamma aerosol size distribution. The computational procedures for relating the calculated volume angular scattering coefficients at 45° and the cross-sectional areas of the distributions to the constants of the gamma distribution are discussed. A limited set of angular scattering coefficients at 45° available from polar nephelometer measurements of San Nicolas Island are used to calculate infrared extinction coefficients (3.5 - 4.0 μm) from the model with Mie theory. The calculated extinction coefficients are compared with those measured by a Barnes transmissometer which operated over a 4.1 km sea water path at SNI at the same times as the nephelometer measurements. With the molecular contributions removed from the Barnes data using LOWTRAN 3B the calculated and measured aerosol extinction coefficients differed by less than 30 percent with an average percent of different 16 percent for the data set.

Paper Details

Date Published: 30 December 1981
PDF: 11 pages
Proc. SPIE 0305, Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance, (30 December 1981); doi: 10.1117/12.932719
Show Author Affiliations
Herbert G. Hughes, Naval Ocean Systems Center (United States)


Published in SPIE Proceedings Vol. 0305:
Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance
Richard Gomez, Editor(s)

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