Biogeochemistry of iron in Australian dust: From eolian uplift to marine uptake

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Title Biogeochemistry of iron in Australian dust: From eolian uplift to marine uptake
Author Mackie, Doug S.; Boyd, Philip W.; McTainsh, Grant Harvey; Tindale, Neil W.; Westberry, Toby K.; Hunter, Keith A.
Journal Name Geochemistry, Geophysics, Geosystems: G³
Year Published 2008
Place of publication USA
Publisher American Geophysical Union
Abstract Dust is an important vector for iron supply to the ocean, which subsequently impacts ocean productivity, atmospheric CO2 concentrations, and hence global climate. Here, we synthesize the processes influencing the biogeochemistry of Australian dust and compare them with those from other Southern Hemisphere dust sources. Our observations range from soil and dust physical properties to abrasion and cloud chamber chemistry experiments to dust storms and their dispersion and deposition. We then present satellite observations of the impact of episodic dust deposition events on the productivity of low-iron oceanic waters north (i.e., low-nitrate, low-chlorophyll (LNLC)) and south (i.e., high-nitrate, low-chlorophyll (HNLC)) of Australia. Dust deposition from the largest dust storm in over 40 years did not result in iron-mediated algal blooms in either oceanic region. A comparison of Australia with other Southern Hemisphere source regions reveals that the relatively well sampled Australian system is a poor generic model. Furthermore, there are marked distinctions between Southern and Northern Hemisphere iron/dust biogeochemistry that must be recognized by modelers and included in future simulations. Better information is required on the relative role of the atmosphere and ocean on influencing iron biogeochemistry and how their relative influences might change in the future due to climate change.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2008 American Geophysical Union. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 9
Issue Number 3
Page from 1
Page to 24
ISSN 1525-2027
Date Accessioned 2009-04-07
Language en_US
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Atmospheric Sciences; PRE2009-Biological Oceanography; PRE2009-Geochemistry
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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