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Water-affected fraction of natural 1.5–9 μ diameter aerosol particles

1972; Elsevier BV; Volume: 40; Issue: 1 Linguagem: Inglês

10.1016/0021-9797(72)90178-6

1095-7103

J. Rosiński, C. T. Nagamoto,

Atmospheric aerosols and clouds

Abstract The water-affected fraction of a given size class of an aerosol population reflects the change in particle concentration when that population becomes hydrosolized. The water-affected fraction was determined for natural aerosol particles in the 1.5–9 μ diameter size range. The largest change was observed in the 1.5–3 μ size group in a polluted atmosphere, especially in the presence of scattered rain and overcast sky. The aggregates formed through evaporation of cloud droplets seem to be the principal source of smaller hydrosol particles. Parallel determination of changes in air concentration of chloride particles and water-affected fraction of aerosol particles, coupled with analysis of air parcel trajectories, showed excellent agreement in identification of the movement of maritime air parcels over the central part of the continent (Colorado).