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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 113,
D24212,
15 PP., 2008
doi:10.1029/2008JD009955
Effects of soil moisture and dried raindroplet crust on saltation and dust emission
Department of Safety Systems Construction Engineering, Faculty of Engineering, Kagawa University, Takamatsu, Kagawa, Japan
Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
Department of Environment and Climate Change, New South Wales Government, Gunnedah, New South Wales, Australia
Rapid Engineering Team, Advanced Technology Support Division, RIKEN, Wako, Japan
Department of Environment and Climate Change, New South Wales Government, Gunnedah, New South Wales, Australia
Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia
Field experiments using a sand particle counter and an optical particle counter clarified the links between saltation and dust emission under wet and weakly crusted conditions in a fallow field previously cultivated with wheat in Australia. A crust was formed by the impact of raindroplets after small precipitation events. A little soil moisture enhanced the strengths of crust and aggregation even though the soil was dried. Dust concentration was proportional to friction wind velocity, but the proportionality was dependent on ground surface conditions, such as the minimally dispersed particle size distribution of parent soil and the presence or absence of crust.
Received 12 February 2008; accepted 17 September 2008; published 30 December 2008.
Citation: (2008), Effects of soil moisture and dried raindroplet crust on saltation and dust emission, J. Geophys. Res., 113, D24212, doi:10.1029/2008JD009955.
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