The Effect of Hygroscopic Particles on the Backscattered Power from a Laser Beam

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  • 1 Institute of Atmospheric Physics, University of Arizona, Tucson
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Abstract

The growth with increasing relative humidity of hygroscopic particles common in the atmosphere was calculated using Köhler's equations; two types of hygroscopic particles were considered, continental and maritime. By means of the Mie scattering equations, calculations were made of the attenuation and backscattering properties of a sample of hygroscopic particles with a Junge size distribution as a function of relative humidity. These calculated properties were applied to model aerosol atmospheres. The results show that measurements of spatial concentrations of particles from the backscattered power from a laser beam are significantly affected by hygroscopic particle growth. In particular, it is found that the growth of maritime hygroscopic particles has a much greater effect on the backscattered power from an aerosol atmosphere than that of continental hygroscopic particles.

Abstract

The growth with increasing relative humidity of hygroscopic particles common in the atmosphere was calculated using Köhler's equations; two types of hygroscopic particles were considered, continental and maritime. By means of the Mie scattering equations, calculations were made of the attenuation and backscattering properties of a sample of hygroscopic particles with a Junge size distribution as a function of relative humidity. These calculated properties were applied to model aerosol atmospheres. The results show that measurements of spatial concentrations of particles from the backscattered power from a laser beam are significantly affected by hygroscopic particle growth. In particular, it is found that the growth of maritime hygroscopic particles has a much greater effect on the backscattered power from an aerosol atmosphere than that of continental hygroscopic particles.

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