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Atmospheric trace metal deposition from natural and anthropogenic sources in Western Australia

Citation

Strzelec, M and Proemse, BC and Barmuta, LA and Gault-Ringold, M and Desservettaz, M and Boyd, PW and Perron, MMG and Schofield, R and Bowie, AR, Atmospheric trace metal deposition from natural and anthropogenic sources in Western Australia, Atmosphere, 11, (5) Article 474. 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/atmos11050474

Abstract

Aerosols from Western Australia supply micronutrient trace elements including Fe into the western shelf of Australia and further afield into the Southern and Indian Oceans. However, regional observations of atmospheric trace metal deposition are limited. Here, we applied a series of leaching experiments followed by total analysis of bulk aerosol samples to a unique time-series of aerosol samples collected in Western Australia to determine atmospheric concentrations and solubilities of Fe and V, Mn, Co, Zn, and Pb. Positive matrix factorisation analysis indicated that mineral dust, biomass burning particulates, sea salt, and industrial emissions were the major types of aerosols. Overall, natural sources dominated Fe deposition. Higher atmospheric concentrations of mineral dust (sixfold) and biomass burning emissions were observed in warmer compared to cooler months. The fraction of labile Fe (0.66.0%) was lower than that reported for other regions of Australia. Bushfire emissions are a temporary source of labile Fe and may cause a peak in the delivery of its more easily available forms to the ocean. Increased labile Fe deposition may result in higher ocean productivity in regions where Fe is limiting, and the effect of aerosol deposition on ocean productivity in this region requires further study.

Item Details

Item Type:Refereed Article
Keywords:aerosols, trace metals, deposition, Western Australia, iron cycle, leaching experiment, mineral dust, bushfires, iron solubility, LNLC, HNLC
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:Barmuta, LA (Associate Professor Leon Barmuta)
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:139144
Year Published:2020
Funding Support:Australian Research Council (FT130100037)
Web of Science® Times Cited:3
Deposited By:Oceans and Cryosphere
Deposited On:2020-05-27
Last Modified:2020-12-22
Downloads:8 View Download Statistics

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