Abstract

A statistical technique for deriving size distribution models of tropospheric air-borne particles is described. The technique provides an estimate of the probable average size distribution for any total particle concentration between 0.1 and 10.0 cm−3 for three different geographical locations. The size distribution data obtained by Blifford and Ringer (1969), and Blifford (1970) are used to derive models of particle size distribution for three locations: Scottsbluff, Nebraska; Death Valley, California; and the Pacific Ocean, 250 km west of Santa Barbara, California. As a special application, these models are fitted by an optimization procedure to the modified Γ distribution function used by Deirmendjian. Some optical scattering properties of these particle models are estimated by use of Mie's solution, and the results are discussed.

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