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    Dry season aerosol iron solubility in tropical northern Australia

    Access Status
    Open access via publisher
    Authors
    Winton, V.
    Edwards, Peter
    Bowie, A.
    Keywood, M.
    Williams, A.
    Chambers, S.
    Selleck, P.
    Desservettaz, M.
    Mallet, M.
    Paton-Walsh, C.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Winton, V. and Edwards, P. and Bowie, A. and Keywood, M. and Williams, A. and Chambers, S. and Selleck, P. et al. 2016. Dry season aerosol iron solubility in tropical northern Australia. Atmospheric Chemistry and Physics. 16 (19): pp. 12829-12848.
    Source Title
    Atmospheric Chemistry and Physics
    DOI
    10.5194/acp-16-12829-2016
    ISSN
    1680-7316
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE130100029
    URI
    http://hdl.handle.net/20.500.11937/58335
    Collection
    • Curtin Research Publications
    Abstract

    © Author(s) 2016.Marine nitrogen fixation is co-limited by the supply of iron (Fe) and phosphorus in large regions of the global ocean. The deposition of soluble aerosol Fe can initiate nitrogen fixation and trigger toxic algal blooms in nitrate-poor tropical waters. We present dry season soluble Fe data from the Savannah Fires in the Early Dry Season (SAFIRED) campaign in northern Australia that reflects coincident dust and biomass burning sources of soluble aerosol Fe. The mean soluble and total aerosol Fe concentrations were 40 and 500 ng m-3 respectively. Our results show that while biomass burning species may not be a direct source of soluble Fe, biomass burning may substantially enhance the solubility of mineral dust. We observed fractional Fe solubility up to 12% in mixed aerosols. Thus, Fe in dust may be more soluble in the tropics compared to higher latitudes due to higher concentrations of biomass-burning-derived reactive organic species in the atmosphere. In addition, biomass-burning-derived particles can act as a surface for aerosol Fe to bind during atmospheric transport and subsequently be released to the ocean upon deposition. As the aerosol loading is dominated by biomass burning emissions over the tropical waters in the dry season, additions of biomass-burning-derived soluble Fe could have harmful consequences for initiating nitrogen-fixing toxic algal blooms. Future research is required to quantify biomass-burning-derived particle sources of soluble Fe over tropical waters.

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