Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere
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...
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ftdoajarticles:oai:doaj.org/article:2c54f7f54398475685abbcc35a723b58 2023-05-15T18:25:39+02:00 Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere Akinori Ito Morgane M. G. Perron Bernadette C. Proemse Michal Strzelec Melanie Gault-Ringold Philip W. Boyd Andrew R. Bowie 2020-08-01T00:00:00Z https://doi.org/10.1186/s40645-020-00357-9 https://doaj.org/article/2c54f7f54398475685abbcc35a723b58 EN eng SpringerOpen http://link.springer.com/article/10.1186/s40645-020-00357-9 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-020-00357-9 2197-4284 https://doaj.org/article/2c54f7f54398475685abbcc35a723b58 Progress in Earth and Planetary Science, Vol 7, Iss 1, Pp 1-17 (2020) Mineral dust Bushfire Coal mine Climate change Bioaccessible iron Labile iron Geography. Anthropology. Recreation G Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1186/s40645-020-00357-9 2022-12-31T03:29:55Z 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. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Progress in Earth and Planetary Science 7 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Mineral dust Bushfire Coal mine Climate change Bioaccessible iron Labile iron Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
Mineral dust Bushfire Coal mine Climate change Bioaccessible iron Labile iron Geography. Anthropology. Recreation G Geology QE1-996.5 Akinori Ito Morgane M. G. Perron Bernadette C. Proemse Michal Strzelec Melanie Gault-Ringold Philip W. Boyd Andrew R. Bowie Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
topic_facet |
Mineral dust Bushfire Coal mine Climate change Bioaccessible iron Labile iron Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Akinori Ito Morgane M. G. Perron Bernadette C. Proemse Michal Strzelec Melanie Gault-Ringold Philip W. Boyd Andrew R. Bowie |
author_facet |
Akinori Ito Morgane M. G. Perron Bernadette C. Proemse Michal Strzelec Melanie Gault-Ringold Philip W. Boyd Andrew R. Bowie |
author_sort |
Akinori Ito |
title |
Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
title_short |
Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
title_full |
Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
title_fullStr |
Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
title_full_unstemmed |
Evaluation of aerosol iron solubility over Australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the Southern Hemisphere |
title_sort |
evaluation of aerosol iron solubility over australian coastal regions based on inverse modeling: implications of bushfires on bioaccessible iron concentrations in the southern hemisphere |
publisher |
SpringerOpen |
publishDate |
2020 |
url |
https://doi.org/10.1186/s40645-020-00357-9 https://doaj.org/article/2c54f7f54398475685abbcc35a723b58 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Progress in Earth and Planetary Science, Vol 7, Iss 1, Pp 1-17 (2020) |
op_relation |
http://link.springer.com/article/10.1186/s40645-020-00357-9 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-020-00357-9 2197-4284 https://doaj.org/article/2c54f7f54398475685abbcc35a723b58 |
op_doi |
https://doi.org/10.1186/s40645-020-00357-9 |
container_title |
Progress in Earth and Planetary Science |
container_volume |
7 |
container_issue |
1 |
_version_ |
1766207236468637696 |