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Origin, transport and deposition of aerosol iron to Australian coastal waters


Perron, MMG and Proemse, BC and Strzelec, M and Gault-Ringold, M and Boyd, PW and Sanz Rodriguez, E and Paull, B and Bowie, AR, Origin, transport and deposition of aerosol iron to Australian coastal waters, Atmospheric Environment, 228 Article 117432. ISSN 1352-2310 (2020) [Refereed Article]

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Copyright 2020 Elsevier Ltd.

DOI: doi:10.1016/j.atmosenv.2020.117432


Australia is a major source of Fe-laden dust to the anemic marine phytoplankton in the Southern Ocean and to Southern Hemisphere (SH) low latitudes diazotrophic bacteria. However, the paucity of observations and laboratory experiments on SH aerosols biases model predictions of atmospheric Fe deposition to the southern oceans and the subsequent response of ocean productivity. As a result of an extensive shipboard aerosol sampling effort, this study presents laboratory measurements of aerosol Fe concentrations, solubilities and fluxes and analysis of chemical tracers, highlighting the large heterogeneity between aerosol Fe sources in 5 coastal regions around Australia. While dust-sourced high Fe loadings and low Fe solubilities (5%) aerosols dominate the atmospheric burden of the western coasts of Australia, much lower Fe concentrations but greater Fe solubilities (10.5% and 13%) were measured in aerosols along the east coast which was attributed to solubility-enhancing atmospheric reactions with anthropogenic pollutants. Surprisingly high aerosol Fe solubilities (>20%) in northern Australia aerosols were associated with direct emissions or atmospheric reactions with bushfire emissions at tropical latitudes, which accounted for 49% of the total (sum) atmospheric dry deposition flux of labile Fe measured across the continent's surrounding seawaters in this study.

Item Details

Item Type:Refereed Article
Keywords:aerosol, iron, Australian coastal waters, labile iron, dust, anthropogenic pollutants, bushfire, solubility, Southern hemisphere
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Atmospheric aerosols
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Atmospheric composition (incl. greenhouse gas inventory)
UTAS Author:Perron, MMG (Miss Morgane Perron)
UTAS Author:Proemse, BC (Dr Bernadette Proemse)
UTAS Author:Strzelec, M (Mr Michal Strzelec)
UTAS Author:Gault-Ringold, M (Dr Melanie East)
UTAS Author:Boyd, PW (Professor Philip Boyd)
UTAS Author:Sanz Rodriguez, E (Dr Estrella Sanz Rodriguez)
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Bowie, AR (Professor Andrew Bowie)
ID Code:139120
Year Published:2020
Funding Support:Australian Research Council (FT130100037)
Web of Science® Times Cited:7
Deposited By:Oceans and Cryosphere
Deposited On:2020-05-27
Last Modified:2020-12-22

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