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Atmospheric trace metal deposition near the Great Barrier Reef, Australia

Citation

Strzelec, M and Proemse, BC and Gault-Ringold, M and Boyd, PW and Perron, MMG and Schofield, R and Ryan, RG and Ristovski, ZD and Alroe, J and Humphries, RS and Keywood, MD and Ward, J and Bowie, AR, Atmospheric trace metal deposition near the Great Barrier Reef, Australia, Atmosphere, 11, (4) Article 390. ISSN 2073-4433 (2020) [Refereed Article]


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Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/atmos11040390

Abstract

Aerosols deposited into the Great Barrier Reef (GBR) contain iron (Fe) and other trace metals, which may act as micronutrients or as toxins to this sensitive marine ecosystem. In this paper, we quantified the atmospheric deposition of Fe and investigated aerosol sources in Mission Beach (Queensland) next to the GBR. Leaching experiments were applied to distinguish pools of Fe with regard to its solubility. The labile Fe concentration in aerosols was 2.310.6 ng m−3, which is equivalent to 4.9%11.4% of total Fe and was linked to combustion and biomass burning processes, while total Fe was dominated by crustal sources. A one-day precipitation event provided more soluble iron than the average dry deposition flux, 0.165 and 0.143 μmol m−2 day−1, respectively. Scanning Electron Microscopy indicated that alumina-silicates were the main carriers of total Fe and samples affected by combustion emissions were accompanied by regular round-shaped carbonaceous particulates. Collected aerosols contained significant amounts of Cd, Co, Cu, Mo, Mn, Pb, V, and Zn, which were mostly (47.5%96.7%) in the labile form. In this study, we provide the first field data on the atmospheric delivery of Fe and other trace metals to the GBR and propose that this is an important delivery mechanism to this region.

Item Details

Item Type:Refereed Article
Keywords:aerosol, trace metals, deposition, Great Barrier Reef, Australia, Fe solubility, leaching experiments, global Fe cycle, source apportionment, anthropogenic emissions
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:Strzelec, M (Mr Michal Strzelec)
UTAS Author:Proemse, BC (Dr Bernadette Proemse)
UTAS Author:Gault-Ringold, M (Dr Melanie East)
UTAS Author:Boyd, PW (Professor Philip Boyd)
UTAS Author:Perron, MMG (Miss Morgane Perron)
UTAS Author:Bowie, AR (Professor Andrew Bowie)
ID Code:139143
Year Published:2020
Funding Support:Australian Research Council (FT130100037)
Web of Science® Times Cited:2
Deposited By:Oceans and Cryosphere
Deposited On:2020-05-27
Last Modified:2020-12-22
Downloads:4 View Download Statistics

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