Simulating the cloud processing of iron in Australian dust: pH and dust concentration

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Title Simulating the cloud processing of iron in Australian dust: pH and dust concentration
Author Mackie, D.S.; Boyd, P.W.; Hunter, K.A.; McTainsh, Grant Harvey
Journal Name Geophysical Research Letters
Year Published 2005
Place of publication USA
Publisher American Geophysical Union
Abstract We report on the simulated cloud processing of an aerosol iron sample derived from an Australian dust storm. Primary factors influencing the extent and rate of Fe mobilization were pH, duration of extraction and dust concentration. Fe was significantly mobilized below a threshold of pH ∼3.6. After initial rapid mobilization at low pH, the rate of Fe release was constant with constant pH. Between this threshold and pH ∼7.1, dissolved Fe fell to a minimum but above this pH further dissolution of iron occurs, probably due to the formation of soluble ferrates. At our lowest dust concentrations (1–20 mg L−1) the rate of Fe extraction at low pH was constant, while at higher dust concentrations the rate was inversely proportional to dust concentration. Dissolution of iron from dust is thus a complex process and these factors must be considered when modelling the input of iron to the oceans.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.agu.org/journals/gl/
Alternative URI http://dx.doi.org/10.1029/2004GL022122
Volume 32
Issue Number 6
Page from 1
Page to 4
ISSN 0094-8276
Date Accessioned 2006-03-23
Date Available 2009-10-01T05:52:56Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Environmental Sciences
Subject PRE2009-Geomorphology
URI http://hdl.handle.net/10072/4318
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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