On the efficiency with which aerosol particles of radius less than 1 μm are collected by columnar ice crystals |
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Authors: | P K Wang H R Pruppacher |
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Institution: | (1) Department of Atmospheric Sciences, University of California, Los Angeles |
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Abstract: | A theoretical model is presented which allows computing the efficiency with which aerosol particles of 0.001 r 1 m are collected by columnar ice crystals in air of various relative humidities, temperatures, and pressures. Particle capture due to Brownian diffusion, thermo- and diffusiophoresis is considered. It is shown that phoretic effects importantly determine the particle capture process of 0.01 r 1 m. The various pressure-temperature levels studied are found to affect the collection efficiency only ifr>0.1 m. Comparison shows that water drops generally are better aerosol particle scavengers than columnar ice crystals. |
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Keywords: | Atmospheric aerosols Ice crystals Scavenging |
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