11th Conference on Atmospheric Radiation and the 11th Conference on Cloud Physics

Wednesday, 5 June 2002
Asymmetry Parameter Calculations from the Particle Imaging Nephalometer Laboratory Data
Carl G. Schmitt, SPEC, Inc., Boulder, CO; and B. A. Baker and R. P. Lawson
The Particle Imaging (PI) Nephalometer was used to take images and phase function measurements of laboratory grown cloud particles. Phase function measurements were averaged for particles in the same size range and of the same particle habit. A technique was developed to calculate the asymmetry parameter from the observed angular data.

Values of asymmetry parameter for different particle types and size ranges were calculated and compared to available published data and parameterizations. The values for asymmetry parameter calculated from the PI-Nephalometer data ranged from .80 to .85 and were generally similar to or slightly higher than ray-tracing and experimental data for similar particles.

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