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Title: Size-resolved mass and chemical properties of dust aerosols from Australia's Lake Eyre Basin
Authors: Radhi, M
Box, MA
Box, GP
Mitchell, RM
Cohen, DD
Stelcer, E
Keywood, MD
Keywords: Australia
Chemical properties
Ion beams
Issue Date: Sep-2010
Publisher: Elsevier
Citation: Radhi, M., Box, M. A., Box, G. P., Mitchell, R. M., Cohen, D. D., Stelcer, E., & Keywood. M. D. (2010). Size-resolved mass and chemical properties of dust aerosols from Australia's Lake Eyre Basin. Atmospheric Environment, 44(29), 3519-3528. doi:10.1016/j.atmosenv.2010.06.016
Abstract: Australia is the dominant mineral dust source in the southern hemisphere, yet the physical, chemical and optical properties of Australian dust aerosol are presently poorly understood. We have investigated the properties of Australian aerosol at a site near Lake Eyre in central Australia, which is strongly influenced by mineral dust. During a field campaign in November 2007 we collected eight sets of size-resolved aerosol samples for laboratory analysis: six during quiescent conditions, and two during dust storms. Ion Beam Analysis was used to determine the elemental composition of all filter samples. Scatter plots showed that Fe, Al and Ti were well correlated with Si, and hence soil-derived. The Fe/Si ratio was consistently higher than the global crustal average, confirming that Australian dusts are comparatively rich in Fe. Scatter plots for Na and Cl against Si showed clear evidence of a second aerosol population, associated with maritime advection. Profiles of water soluble ions for two sample sets, showed the importance of marine influences on both the fine and coarse modes, as well as the presence of organic acids. Estimates of the mass fraction of NaCl in our samples suggest that, for quiescent days, roughly 0.5% of the sample mass was NaCl. © 2010, Elsevier Ltd.
Gov't Doc #: 2463
ISSN: 1352-2310
Appears in Collections:Journal Articles

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