Accession Number : AD0836883

Title :   INFRARED ABSORPTION SPECTRA OF ATMOSPHERIC DUST,

Corporate Author : ARMY ELECTRONICS COMMAND WHITE SANDS MISSILE RANGE NM ATMOSPHERIC SCIENCES L AB

Personal Author(s) : Blanco, Abel J. ; Hoidale, Glenn B.

Report Date : MAY 1968

Pagination or Media Count : 60

Abstract : Based on the microspectrophotometric analysis of 287 atmospheric dust samples taken within the surface boundary layer over White Sands Missile Range, New Mexico, from May 1966 through October 1967, a representative infrared absorption spectrum spanning the wavenumber range from 4000 to 250/cm is presented. The strongest absorption band is centered at 1027/cm, within the 1250 to 770/cm atmospheric window, and is silicate induced. Two other strong broad absorption bands are the carbonate band at 1425/cm and the silicate band at 468/cm. Temporal variations in the absorption spectra of the dust are observed primarily in the varying relative intensities of the 1027 and 1425/cm absorption bands and in the occasional enhancement of the 1027/cm band caused by sulfates in the dust. This study indicates a close similarity between the absorption spectra of the atmospheric dust and the absorption spectra of the small particle fraction of area soils, and between the representative dust spectrum and a spectrum of a synthetic mixture (by weight) of 80% silicates, 16% carbonates, and 4% nitrates. (Author)

Descriptors :   *INFRARED SPECTRA), (*ATMOSPHERES, DUST), (*DUST, ABSORPTION, SILICATES, CARBONATES, NITRATES, SOILS, INFRARED SPECTROPHOTOMETERS.

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE