Multiple sources of soluble atmospheric iron to Antarctic waters
The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources of iron (Fe) are required to sustain phytoplankton blooms in the austral summer. Atmospheric deposition is one potential source. The fractional solubility of Fe is an important variable determining...
Published in: | Global Biogeochemical Cycles |
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2016
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Online Access: | https://hdl.handle.net/20.500.11937/18054 https://doi.org/10.1002/2015GB005265 |
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/18054 2023-06-11T04:07:09+02:00 Multiple sources of soluble atmospheric iron to Antarctic waters Winton, Victoria Edwards, R. Delmonte, B. Ellis, A. Andersson, P. Bowie, A. Bertler, N. Neff, P. Tuohy, A. 2016 unknown https://hdl.handle.net/20.500.11937/18054 https://doi.org/10.1002/2015GB005265 unknown Wiley-Blackwell Publishing https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/2015GB005265 http://purl.org/au-research/grants/arc/LE130100029 http://hdl.handle.net/20.500.11937/18054 doi:10.1002/2015GB005265 Journal Article 2016 ftcurtin https://doi.org/20.500.11937/1805410.1002/2015GB005265 2023-05-30T19:29:22Z The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources of iron (Fe) are required to sustain phytoplankton blooms in the austral summer. Atmospheric deposition is one potential source. The fractional solubility of Fe is an important variable determining Fe availability for biological uptake. To constrain aerosol Fe inputs to the Ross Sea region, fractional solubility of Fe was analyzed in a snow pit from Roosevelt Island, eastern Ross Sea. In addition, aluminum, dust, and refractory black carbon (rBC) concentrations were analyzed, to determine the contribution of mineral dust and combustion sources to the supply of aerosol Fe. We estimate exceptionally high dissolved Fe (dFe) flux of 1.2 × 10-6 g m-2 y-1 and total dissolvable Fe flux of 140 × 10-6 g m-2 y-1 for 2011/2012. Deposition of dust, Fe, Al, and rBC occurs primarily during spring-summer. The observed background fractional Fe solubility of ~0.7% is consistent with a mineral dust source. Radiogenic isotopic ratios and particle size distribution of dust indicates that the site is influenced by local and remote sources. In 2011/2012 summer, relatively high dFe concentrations paralleled both mineral dust and rBC deposition. Around half of the annual aerosol Fe deposition occurred in the austral summer phytoplankton growth season; however, the fractional Fe solubility was low. Our results suggest that the seasonality of dFe deposition can vary and should be considered on longer glacial-interglacial timescales. Article in Journal/Newspaper Antarc* Antarctic Antarctica Roosevelt Island Ross Sea Southern Ocean Curtin University: espace Antarctic Austral Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) Ross Sea Southern Ocean Global Biogeochemical Cycles 30 3 421 437 |
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Curtin University: espace |
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description |
The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources of iron (Fe) are required to sustain phytoplankton blooms in the austral summer. Atmospheric deposition is one potential source. The fractional solubility of Fe is an important variable determining Fe availability for biological uptake. To constrain aerosol Fe inputs to the Ross Sea region, fractional solubility of Fe was analyzed in a snow pit from Roosevelt Island, eastern Ross Sea. In addition, aluminum, dust, and refractory black carbon (rBC) concentrations were analyzed, to determine the contribution of mineral dust and combustion sources to the supply of aerosol Fe. We estimate exceptionally high dissolved Fe (dFe) flux of 1.2 × 10-6 g m-2 y-1 and total dissolvable Fe flux of 140 × 10-6 g m-2 y-1 for 2011/2012. Deposition of dust, Fe, Al, and rBC occurs primarily during spring-summer. The observed background fractional Fe solubility of ~0.7% is consistent with a mineral dust source. Radiogenic isotopic ratios and particle size distribution of dust indicates that the site is influenced by local and remote sources. In 2011/2012 summer, relatively high dFe concentrations paralleled both mineral dust and rBC deposition. Around half of the annual aerosol Fe deposition occurred in the austral summer phytoplankton growth season; however, the fractional Fe solubility was low. Our results suggest that the seasonality of dFe deposition can vary and should be considered on longer glacial-interglacial timescales. |
format |
Article in Journal/Newspaper |
author |
Winton, Victoria Edwards, R. Delmonte, B. Ellis, A. Andersson, P. Bowie, A. Bertler, N. Neff, P. Tuohy, A. |
spellingShingle |
Winton, Victoria Edwards, R. Delmonte, B. Ellis, A. Andersson, P. Bowie, A. Bertler, N. Neff, P. Tuohy, A. Multiple sources of soluble atmospheric iron to Antarctic waters |
author_facet |
Winton, Victoria Edwards, R. Delmonte, B. Ellis, A. Andersson, P. Bowie, A. Bertler, N. Neff, P. Tuohy, A. |
author_sort |
Winton, Victoria |
title |
Multiple sources of soluble atmospheric iron to Antarctic waters |
title_short |
Multiple sources of soluble atmospheric iron to Antarctic waters |
title_full |
Multiple sources of soluble atmospheric iron to Antarctic waters |
title_fullStr |
Multiple sources of soluble atmospheric iron to Antarctic waters |
title_full_unstemmed |
Multiple sources of soluble atmospheric iron to Antarctic waters |
title_sort |
multiple sources of soluble atmospheric iron to antarctic waters |
publisher |
Wiley-Blackwell Publishing |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.11937/18054 https://doi.org/10.1002/2015GB005265 |
long_lat |
ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
geographic |
Antarctic Austral Roosevelt Island Ross Sea Southern Ocean |
geographic_facet |
Antarctic Austral Roosevelt Island Ross Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctica Roosevelt Island Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Roosevelt Island Ross Sea Southern Ocean |
op_relation |
https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/2015GB005265 http://purl.org/au-research/grants/arc/LE130100029 http://hdl.handle.net/20.500.11937/18054 doi:10.1002/2015GB005265 |
op_doi |
https://doi.org/20.500.11937/1805410.1002/2015GB005265 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
3 |
container_start_page |
421 |
op_container_end_page |
437 |
_version_ |
1768379926026649600 |