title: Spectral absorption characteristics of the major components of dust clouds.
abstract: It is well known that dust clouds selectively absorb radiation in the 700-1300 cm(-1) atmospheric window region. Studies have shown that dust clouds are composed of the same minerals as surface soils, although in different proportion. We have examined seventy soil samples from a number of locations around the world to determine their compositions and spectral characteristics. The results indicate that there are five major components which selectively absorb radiation in the 700-1300 cm(-1) region. These are three clay minerals, silica, and calcium carbonate. Absorptivity coefficient spectra of representative soil samples are given.
authors.forename: D F
authors.initials: DF
authors.lastname: Flanigan
authors.forename: H P
authors.initials: HP
authors.lastname: Delong