Fractional iron solubility of atmospheric iron inputs to the Southern Ocean
Deposition of iron (Fe) bearing aerosols to Fe deficient waters of the Southern Ocean may drive rapid changes in primary productivity, trophic structure and the biological uptake of carbon dioxide. The fractional solubility (i.e., the ratio of water leachable Fe to total Fe) of aerosol Fe is an impo...
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Online Access: | https://doi.org/10.1016/j.marchem.2015.06.006 http://ecite.utas.edu.au/103858 |
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ftunivtasecite:oai:ecite.utas.edu.au:103858 2023-05-15T18:23:48+02:00 Fractional iron solubility of atmospheric iron inputs to the Southern Ocean Winton, VHL Bowie, AR Edwards, R Keywood, M Townsend, AT van der Merwe, P Bollhofer, A 2015 https://doi.org/10.1016/j.marchem.2015.06.006 http://ecite.utas.edu.au/103858 en eng Elsevier Science Bv http://dx.doi.org/10.1016/j.marchem.2015.06.006 Winton, VHL and Bowie, AR and Edwards, R and Keywood, M and Townsend, AT and van der Merwe, P and Bollhofer, A, Fractional iron solubility of atmospheric iron inputs to the Southern Ocean, Marine Chemistry, 177, (1) pp. 20-32. ISSN 0304-4203 (2015) [Refereed Article] http://ecite.utas.edu.au/103858 Earth Sciences Atmospheric Sciences Atmospheric Aerosols Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1016/j.marchem.2015.06.006 2019-12-13T22:05:13Z Deposition of iron (Fe) bearing aerosols to Fe deficient waters of the Southern Ocean may drive rapid changes in primary productivity, trophic structure and the biological uptake of carbon dioxide. The fractional solubility (i.e., the ratio of water leachable Fe to total Fe) of aerosol Fe is an important variable determining its availability for biological uptake, and is a function of both particle type and the experimental conditions used to leach the particles. There have been few studies of fractional Fe solubility over the Southern Ocean where the aerosol loading is the lowest in the world. To investigate Southern Ocean aerosol Fe solubility, the fractional solubility of Fe was determined in cryogenically archived Southern Ocean aerosols. Samples were collected at the Cape Grim Baseline Air Pollution Station (CGBAPS), Tasmania, Australia from February 1999 to April 2000. Fractions determined included water soluble Fe (<0.45μm), labile Fe (>0.45μm; acetic acid and hydroxylamine hydrochloride leachable Fe) and refractory Fe (>0.45μm; total digestion using nitric and hydrofluoric acids). Extremely low Fe mass concentrations were observed for baseline Southern Ocean air during the study period. An inverse hyperbolic relationship was observed between fractional Fe solubility (0.5 to 56%) and total Fe mass concentration (0.04 to 5.8ngm 3 excluding an anomalously high sample). A peak of 4.6ngm 3 of labile Fe occurred during May/June 1999 and was linked to atmospheric transport from South Western Australia over the Southern Ocean. Bioavailable Fe was estimated by summing the water soluble and labile Fe fractions, and this likely represents the upper bound of long range transport aerosol over the Southern Ocean. The results confirm previous reports of a range of fractional Fe solubility within all atmospheric particles measured and also suggest that a large fraction of the Fe from Australian mineral aerosols is labile and potentially bioavailable. Article in Journal/Newspaper Southern Ocean eCite UTAS (University of Tasmania) Grim ENVELOPE(-64.486,-64.486,-65.379,-65.379) Southern Ocean Marine Chemistry 177 20 32 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Atmospheric Sciences Atmospheric Aerosols |
spellingShingle |
Earth Sciences Atmospheric Sciences Atmospheric Aerosols Winton, VHL Bowie, AR Edwards, R Keywood, M Townsend, AT van der Merwe, P Bollhofer, A Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
topic_facet |
Earth Sciences Atmospheric Sciences Atmospheric Aerosols |
description |
Deposition of iron (Fe) bearing aerosols to Fe deficient waters of the Southern Ocean may drive rapid changes in primary productivity, trophic structure and the biological uptake of carbon dioxide. The fractional solubility (i.e., the ratio of water leachable Fe to total Fe) of aerosol Fe is an important variable determining its availability for biological uptake, and is a function of both particle type and the experimental conditions used to leach the particles. There have been few studies of fractional Fe solubility over the Southern Ocean where the aerosol loading is the lowest in the world. To investigate Southern Ocean aerosol Fe solubility, the fractional solubility of Fe was determined in cryogenically archived Southern Ocean aerosols. Samples were collected at the Cape Grim Baseline Air Pollution Station (CGBAPS), Tasmania, Australia from February 1999 to April 2000. Fractions determined included water soluble Fe (<0.45μm), labile Fe (>0.45μm; acetic acid and hydroxylamine hydrochloride leachable Fe) and refractory Fe (>0.45μm; total digestion using nitric and hydrofluoric acids). Extremely low Fe mass concentrations were observed for baseline Southern Ocean air during the study period. An inverse hyperbolic relationship was observed between fractional Fe solubility (0.5 to 56%) and total Fe mass concentration (0.04 to 5.8ngm 3 excluding an anomalously high sample). A peak of 4.6ngm 3 of labile Fe occurred during May/June 1999 and was linked to atmospheric transport from South Western Australia over the Southern Ocean. Bioavailable Fe was estimated by summing the water soluble and labile Fe fractions, and this likely represents the upper bound of long range transport aerosol over the Southern Ocean. The results confirm previous reports of a range of fractional Fe solubility within all atmospheric particles measured and also suggest that a large fraction of the Fe from Australian mineral aerosols is labile and potentially bioavailable. |
format |
Article in Journal/Newspaper |
author |
Winton, VHL Bowie, AR Edwards, R Keywood, M Townsend, AT van der Merwe, P Bollhofer, A |
author_facet |
Winton, VHL Bowie, AR Edwards, R Keywood, M Townsend, AT van der Merwe, P Bollhofer, A |
author_sort |
Winton, VHL |
title |
Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
title_short |
Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
title_full |
Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
title_fullStr |
Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
title_full_unstemmed |
Fractional iron solubility of atmospheric iron inputs to the Southern Ocean |
title_sort |
fractional iron solubility of atmospheric iron inputs to the southern ocean |
publisher |
Elsevier Science Bv |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.marchem.2015.06.006 http://ecite.utas.edu.au/103858 |
long_lat |
ENVELOPE(-64.486,-64.486,-65.379,-65.379) |
geographic |
Grim Southern Ocean |
geographic_facet |
Grim Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://dx.doi.org/10.1016/j.marchem.2015.06.006 Winton, VHL and Bowie, AR and Edwards, R and Keywood, M and Townsend, AT and van der Merwe, P and Bollhofer, A, Fractional iron solubility of atmospheric iron inputs to the Southern Ocean, Marine Chemistry, 177, (1) pp. 20-32. ISSN 0304-4203 (2015) [Refereed Article] http://ecite.utas.edu.au/103858 |
op_doi |
https://doi.org/10.1016/j.marchem.2015.06.006 |
container_title |
Marine Chemistry |
container_volume |
177 |
container_start_page |
20 |
op_container_end_page |
32 |
_version_ |
1766203944659320832 |