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Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere

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Ito, A, Perron, MMG ORCID: 0000-0001-5424-7138, Proemse, BC ORCID: 0000-0002-6630-6892, Strzelec, M, Gault-Ringold, M, Boyd, PW ORCID: 0000-0001-7850-1911 and Bowie, AR ORCID: 0000-0002-5144-7799 2020 , 'Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere' , Progress in Earth and Planetary Science, vol. 7, no. 1 , pp. 1-17 , doi: 10.1186/s40645-020-00357-9.

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Abstract

Mineral dust is the major source of external micro-nutrients such as iron (Fe) to the open ocean. However, large uncertainties in model estimates of Fe emissions and aerosol-bearing Fe solubility (i.e., the ratio of labile Fe (LFe) to total Fe (TFe)) in the Southern Hemisphere (SH) hampered accurate estimates of atmospheric delivery of bioavailable Fe to the Southern Ocean. This study applied an inverse modeling technique to a global aerosol chemistry transport model (IMPACT) in order to optimize predictions of mineral aerosol Fe concentrations based on recent observational data over Australian coastal regions (110°E–160°E and 10°S–41°S). The optimized (a posteriori) model did not only better capture aerosol TFe concentrations downwind from Australian dust outbreak but also successfully reproduced enhanced Fe solubility (7.8 ± 8.4%) and resulted in much better agreement of LFe concentrations with the field measurements (1.4 ± 1.5 vs. 1.4 ± 2.3 ng Fe m–3). The a posteriori model estimates suggested that bushfires contributed a large fraction of LFe concentrations in aerosols, although substantial contribution from missing sources (e.g., coal mining activities, volcanic eruption, and secondary formation) was still inferred. These findings may have important implications for the projection of future micro-nutrient supply to the oceans as increasing frequency and intensity of open biomass burning are projected in the SH.

Item Type: Article
Authors/Creators:Ito, A and Perron, MMG and Proemse, BC and Strzelec, M and Gault-Ringold, M and Boyd, PW and Bowie, AR
Keywords: aerosols, iron, solubility, Australia, coasts, modeling, bushfires, coal mine, climate change, bioaccessible iron, labile iron
Journal or Publication Title: Progress in Earth and Planetary Science
Publisher: Springer
ISSN: 2197-4284
DOI / ID Number: 10.1186/s40645-020-00357-9
Copyright Information:

© The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/) which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

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