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...
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Online Access: | https://doi.org/10.1002/2015GB005265 http://ecite.utas.edu.au/108914 |
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ftunivtasecite:oai:ecite.utas.edu.au:108914 2023-05-15T14:03:26+02:00 Multiple sources of soluble atmospheric iron to Antarctic waters Winton, VHL Edwards, R Delmonte, B Ellis, A Andersson, PS Bowie, A Bertler, NAN Neff, P Tuohy, A 2016 https://doi.org/10.1002/2015GB005265 http://ecite.utas.edu.au/108914 en eng Amer Geophysical Union http://dx.doi.org/10.1002/2015GB005265 http://purl.org/au-research/grants/arc/FT130100037 Winton, VHL and Edwards, R and Delmonte, B and Ellis, A and Andersson, PS and Bowie, A and Bertler, NAN and Neff, P and Tuohy, A, Multiple sources of soluble atmospheric iron to Antarctic waters, Global Biogeochemical Cycles, 30, (3) pp. 421-437. ISSN 0886-6236 (2016) [Refereed Article] http://ecite.utas.edu.au/108914 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1002/2015GB005265 2019-12-13T22:09:41Z 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 eCite UTAS (University of Tasmania) Antarctic Austral Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) Ross Sea Southern Ocean Global Biogeochemical Cycles 30 3 421 437 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Winton, VHL Edwards, R Delmonte, B Ellis, A Andersson, PS Bowie, A Bertler, NAN Neff, P Tuohy, A Multiple sources of soluble atmospheric iron to Antarctic waters |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
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, VHL Edwards, R Delmonte, B Ellis, A Andersson, PS Bowie, A Bertler, NAN Neff, P Tuohy, A |
author_facet |
Winton, VHL Edwards, R Delmonte, B Ellis, A Andersson, PS Bowie, A Bertler, NAN Neff, P Tuohy, A |
author_sort |
Winton, VHL |
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 |
Amer Geophysical Union |
publishDate |
2016 |
url |
https://doi.org/10.1002/2015GB005265 http://ecite.utas.edu.au/108914 |
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 |
http://dx.doi.org/10.1002/2015GB005265 http://purl.org/au-research/grants/arc/FT130100037 Winton, VHL and Edwards, R and Delmonte, B and Ellis, A and Andersson, PS and Bowie, A and Bertler, NAN and Neff, P and Tuohy, A, Multiple sources of soluble atmospheric iron to Antarctic waters, Global Biogeochemical Cycles, 30, (3) pp. 421-437. ISSN 0886-6236 (2016) [Refereed Article] http://ecite.utas.edu.au/108914 |
op_doi |
https://doi.org/10.1002/2015GB005265 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
3 |
container_start_page |
421 |
op_container_end_page |
437 |
_version_ |
1766274086675152896 |