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Aerosol composition as a function of haze and humidity levels in the Southwestern U.S.

Authors
Journal
Atmospheric Environment
1352-2310
Publisher
Elsevier
Publication Date
Volume
28
Issue
22
Identifiers
DOI: 10.1016/1352-2310(94)00187-p
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract The observed composition of visibility-reducing aerosols in the Grand Canyon region is summarized in climatological terms. Observations are from SCENES, a measurement program extending from 1984 to 1989. Results are presented as average mass balances stratified by various factors. Aerosols were found to exhibit substantial seasonal variation, but little systematic diurnal variation. Crustal material was a dynamic component, and peaked during springtime. Aerosol composition, but not total concentration, depended strongly on ambient relative humidity, with crustal material augmented at low humidities and sulfates augmented at high humidities. Total fine-particle concentrations correlated strongly with light scattering, as expected; however, little association between chemical composition and light scattering was observed.

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