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

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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.

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