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...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
figshare
2020
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.5102278.v1 https://springernature.figshare.com/collections/Evaluation_of_aerosol_iron_solubility_over_Australian_coastal_regions_based_on_inverse_modeling_implications_of_bushfires_on_bioaccessible_iron_concentrations_in_the_Southern_Hemisphere/5102278/1 |
id |
ftdatacite:10.6084/m9.figshare.c.5102278.v1 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.c.5102278.v1 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 Ito, Akinori Perron, Morgane M. G. Proemse, Bernadette C. Strzelec, Michal Gault-Ringold, Melanie Boyd, Philip W. Bowie, Andrew R. 2020 https://dx.doi.org/10.6084/m9.figshare.c.5102278.v1 https://springernature.figshare.com/collections/Evaluation_of_aerosol_iron_solubility_over_Australian_coastal_regions_based_on_inverse_modeling_implications_of_bushfires_on_bioaccessible_iron_concentrations_in_the_Southern_Hemisphere/5102278/1 unknown figshare https://dx.doi.org/10.1186/s40645-020-00357-9 https://dx.doi.org/10.6084/m9.figshare.c.5102278 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Oceanography FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5102278.v1 https://doi.org/10.1186/s40645-020-00357-9 https://doi.org/10.6084/m9.figshare.c.5102278 2021-11-05T12:55:41Z 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 DataCite Metadata Store (German National Library of Science and Technology) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Oceanography FOS Earth and related environmental sciences |
spellingShingle |
Oceanography FOS Earth and related environmental sciences Ito, Akinori Perron, Morgane M. G. Proemse, Bernadette C. Strzelec, Michal Gault-Ringold, Melanie Boyd, Philip W. Bowie, Andrew R. 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 |
Oceanography FOS Earth and related environmental sciences |
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 |
Ito, Akinori Perron, Morgane M. G. Proemse, Bernadette C. Strzelec, Michal Gault-Ringold, Melanie Boyd, Philip W. Bowie, Andrew R. |
author_facet |
Ito, Akinori Perron, Morgane M. G. Proemse, Bernadette C. Strzelec, Michal Gault-Ringold, Melanie Boyd, Philip W. Bowie, Andrew R. |
author_sort |
Ito, Akinori |
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 |
figshare |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5102278.v1 https://springernature.figshare.com/collections/Evaluation_of_aerosol_iron_solubility_over_Australian_coastal_regions_based_on_inverse_modeling_implications_of_bushfires_on_bioaccessible_iron_concentrations_in_the_Southern_Hemisphere/5102278/1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1186/s40645-020-00357-9 https://dx.doi.org/10.6084/m9.figshare.c.5102278 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5102278.v1 https://doi.org/10.1186/s40645-020-00357-9 https://doi.org/10.6084/m9.figshare.c.5102278 |
_version_ |
1766207243604197376 |