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AGU: Geophysical Research Letters

 

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  • Atmospheric Composition and Structure: Aerosols and particles

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1868, 4 PP., 2002
doi:10.1029/2002GL015248

Saltation Sandblasting behavior during mineral dust aerosol production

Alf Grini

Department of Geophysics, University of Oslo, Oslo, Norway

Charles S. Zender

Department of Earth System Science, University of California, Irvine, CA, USA

Peter R. Colarco

Laboratory for Atmospheric and Space Physics, Program in Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, USA

The dominant process in producing fine dust aerosols during saltation is thought to be sandblasting. Recent studies claim that due to competing physical processes, emission efficiencies of dust aerosols oscillate with increasing wind friction speed. These oscillations can result in order of magnitude changes in dust mass emissions. Our work shows that emission efficiencies, and hence emissions of dust aerosols are smooth functions of the wind friction speed for natural soil size distributions. This rules out oscillations as an explanation for scatter in experimental data. We show and explain the reasons for the oscillations.

Published 20 September 2002.

Citation: Grini, A., C. S. Zender, and P. R. Colarco (2002), Saltation Sandblasting behavior during mineral dust aerosol production, Geophys. Res. Lett., 29(18), 1868, doi:10.1029/2002GL015248.

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