The author is with U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, Research Division, Aberdeen Proving Ground, Maryland 21010
Erratum: Two of the pages (686 and 690) were transposed when this paper was published in 1 March issue. It is now published again with the pages in correct sequence.
Hugh R. CarIon, "Contributions of particle absorption to mass extinction coefficients (0.55–14 μm) of soil-derived atmospheric dusts: erratum," Appl. Opt. 19, 1165-1172 (1980)
Mass extinction coefficients of soil-derived atmospheric dusts often are determined largely by the absorption (rather than scattering) by individual particles, especially at longer IR wavelengths. Under many conditions, reasonable estimates of mass extinction coefficients of dusts can be made from absorption coefficients without the need for detailed knowledge of particle optical constants to perform, e.g., Mie calculations. This paper discusses absorption coefficients of dusts in the visible and IR wavelengths and the physical mechanisms of dust aerosol generation determining that portion of extinction attributable to absorption in a given dust cloud. Some soils, especially clays, can produce dust clouds that are almost pure absorbers at longer IR wavelengths.
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Calculated from Eqs. (3) and (4) for the Rayleigh case (Du ≪ λ).
For the Mie and geometric scattering cases, the interrelationships between kλ and αAλ are more complex (see Ref. 13), and other techniques for the approximation of extinction coefficients apply (see Ref. 3). The values shown in parentheses are calculated using Eqs. (3) and (4) but would be approximately correct only for fine natural aerosol particles, e.g., the left-hand mode of the dashed curve in Fig. 2.
Probably a good approximation even at λ = 1.06 μm, since soot typically is composed of particles with diameters predominantly near Du = 0.1 μm, and the Rayleigh case (Du ≪ λ) applies.
Calculated from Eqs. (3) and (4) for the Rayleigh case (Du ≪ λ).
For the Mie and geometric scattering cases, the interrelationships between kλ and αAλ are more complex (see Ref. 13), and other techniques for the approximation of extinction coefficients apply (see Ref. 3). The values shown in parentheses are calculated using Eqs. (3) and (4) but would be approximately correct only for fine natural aerosol particles, e.g., the left-hand mode of the dashed curve in Fig. 2.
Probably a good approximation even at λ = 1.06 μm, since soot typically is composed of particles with diameters predominantly near Du = 0.1 μm, and the Rayleigh case (Du ≪ λ) applies.