Modified Gamma Aerosol Model For The Marine Environment

Herbert G. Hughes

doi:10.1117/12.932719

30 December 1981 Modified Gamma Aerosol Model For The Marine Environment

Herbert G. Hughes

Proceedings Volume 0305, Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance; (1981) https://doi.org/10.1117/12.932719
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

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.

Citation Download Citation

Herbert G. Hughes "Modified Gamma Aerosol Model For The Marine Environment", Proc. SPIE 0305, Atmospheric Effects on Electro-Optical, Infrared, and Millimeter Wave Systems Performance, (30 December 1981); https://doi.org/10.1117/12.932719

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