Seasonal Variations in Ultraviolet Single Scattering Phase Functions.
AERONAUTICAL RESEARCH ASSOCIATES OF PRINCETON INC N J
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Ultraviolet single scattering phase functions have been measured with a scanning polar nephelometer in a wide variety of weather conditions for rural, industrial, maritime, and desert atmospheres. Good correlation between measured phase functions and those predicted from Mie and Rayleigh theory using measured aerosol particle size distributions was generally observed in the fall and winter months and in fogs. Measured phase functions generally exceeded predicted values in the spring and summer months because of inadequacies in either the particle size measurement technique or the representation of aerosol particles as spherical dielectrics. Attempts to verify the phase functions measured at scattering angles below ten degrees with variable field of view attenuation and scattering techniques were generally unsuccessful due to rapidly changing aerosol and ozone concentrations. An algorithm has been found for correlating the ultraviolet aerosol scattering coefficient with visibility. Author
- Atmospheric Physics
- Ultraviolet Detection and Detectors