Articles | Volume 14, issue 17
Atmos. Chem. Phys., 14, 8869–8882, 2014
https://doi.org/10.5194/acp-14-8869-2014
Atmos. Chem. Phys., 14, 8869–8882, 2014
https://doi.org/10.5194/acp-14-8869-2014

Research article 01 Sep 2014

Research article | 01 Sep 2014

Measurements of dust deposition velocity in a wind-tunnel experiment

J. Zhang1,2, Y. Shao2, and N. Huang1 J. Zhang et al.
  • 1Key Laboratory of Mechanics on Disaster and Environment in Western China of the Ministry of Education of China, Lanzhou University, 730000 Lanzhou, China
  • 2The Institute for Geophysics and Meteorology, University of Cologne, 50973 Cologne, Germany

Abstract. In this study, we present the results of a wind-tunnel experiment on dust deposition. A new method is proposed to derive dust deposition velocity from PDA (particle dynamics analysis) particle-velocity and particle-size measurements. This method has the advantage that the motions of individual dust particles are directly observed and all relevant data for computing dust deposition velocity is collected using a single instrument, and thus the measurement uncertainties are reduced. The method is used in the wind-tunnel experiment to measure dust deposition velocities for different particle sizes, wind speeds and surface conditions. For sticky-smooth wood and water surfaces, the observed dust deposition velocities are compared with the predictions using a dust deposition scheme, and the entire data set is compared with the data found in the literature. From the wind-tunnel experiments, a relatively reliable data set of dust deposition velocities is obtained, which is valuable for the development and validation of dust deposition schemes.

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