The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica
Iron is a limiting micronutrient for primary production in the Ross Sea, Antarctica. Recent observations reveal low dissolved Fe (dFe) concentrations in the Ross Sea polynya following high initial rates of primary production in summer, after the dFe winter reserve has been consumed. Significant new...
Published in: | Global Biogeochemical Cycles |
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American Geophysical Union
2014
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:91587 2023-05-15T14:01:42+02:00 The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica Winton, V. H. L. Dunbar, G. B. Bertler, N. A. N. Millet, Marc-Alban Delmonte, B. Atkins, C. B. Chewings, J. M. Andersson, P. 2014-04-01 https://orca.cardiff.ac.uk/id/eprint/91587/ https://doi.org/10.1002/2013GB004574 unknown American Geophysical Union Winton, V. H. L., Dunbar, G. B., Bertler, N. A. N., Millet, Marc-Alban https://orca.cardiff.ac.uk/view/cardiffauthors/A2249319T.html orcid:0000-0003-2710-5374 orcid:0000-0003-2710-5374, Delmonte, B., Atkins, C. B., Chewings, J. M. and Andersson, P. 2014. The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica. Global Biogeochemical Cycles 28 (4) , pp. 423-436. 10.1002/2013GB004574 https://doi.org/10.1002/2013GB004574 doi:10.1002/2013GB004574 Article PeerReviewed 2014 ftunivcardiff https://doi.org/10.1002/2013GB004574 2022-11-03T23:39:24Z Iron is a limiting micronutrient for primary production in the Ross Sea, Antarctica. Recent observations reveal low dissolved Fe (dFe) concentrations in the Ross Sea polynya following high initial rates of primary production in summer, after the dFe winter reserve has been consumed. Significant new sources of dFe are therefore required to further sustain phytoplankton blooms. Iron from aeolian sand and dust (ASD) released from melting sea ice is one potential source. To constrain aeolian Fe inputs, we determined ASD mass accumulation rates and the total and soluble Fe content of ASD on sea ice in McMurdo Sound, southwestern (SW) Ross Sea. The mean mass accumulation rate was ~1.5 g m−2 yr−1, total Fe content of this ASD was 4 ± 1 wt %, and the percentage of soluble Fe was 11 ± 1%. Our mean estimate of the bulk aeolian dFe flux of 122.1 µmol m−2 yr−1 for the McMurdo Sound region suggests that aeolian Fe can support between 9.0 × 109 and 4.1 × 1011 mol C yr−1 (0.1–4.9 Tg C yr−1) of new primary production. This equates to only ~15% of new primary production in the SW Ross Sea, suggesting that aeolian dFe is a minor component of seasonal Fe supply. The very high ASD accumulation on sea ice in McMurdo Sound compared to other regions of Antarctica suggests that our results represent the upper limit of dFe supply to the ocean from this source in the Ross Sea Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Ross Sea Sea ice Cardiff University: ORCA (Online Research @ Cardiff) McMurdo Sound Ross Sea Global Biogeochemical Cycles 28 4 423 436 |
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Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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ftunivcardiff |
language |
unknown |
description |
Iron is a limiting micronutrient for primary production in the Ross Sea, Antarctica. Recent observations reveal low dissolved Fe (dFe) concentrations in the Ross Sea polynya following high initial rates of primary production in summer, after the dFe winter reserve has been consumed. Significant new sources of dFe are therefore required to further sustain phytoplankton blooms. Iron from aeolian sand and dust (ASD) released from melting sea ice is one potential source. To constrain aeolian Fe inputs, we determined ASD mass accumulation rates and the total and soluble Fe content of ASD on sea ice in McMurdo Sound, southwestern (SW) Ross Sea. The mean mass accumulation rate was ~1.5 g m−2 yr−1, total Fe content of this ASD was 4 ± 1 wt %, and the percentage of soluble Fe was 11 ± 1%. Our mean estimate of the bulk aeolian dFe flux of 122.1 µmol m−2 yr−1 for the McMurdo Sound region suggests that aeolian Fe can support between 9.0 × 109 and 4.1 × 1011 mol C yr−1 (0.1–4.9 Tg C yr−1) of new primary production. This equates to only ~15% of new primary production in the SW Ross Sea, suggesting that aeolian dFe is a minor component of seasonal Fe supply. The very high ASD accumulation on sea ice in McMurdo Sound compared to other regions of Antarctica suggests that our results represent the upper limit of dFe supply to the ocean from this source in the Ross Sea |
format |
Article in Journal/Newspaper |
author |
Winton, V. H. L. Dunbar, G. B. Bertler, N. A. N. Millet, Marc-Alban Delmonte, B. Atkins, C. B. Chewings, J. M. Andersson, P. |
spellingShingle |
Winton, V. H. L. Dunbar, G. B. Bertler, N. A. N. Millet, Marc-Alban Delmonte, B. Atkins, C. B. Chewings, J. M. Andersson, P. The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
author_facet |
Winton, V. H. L. Dunbar, G. B. Bertler, N. A. N. Millet, Marc-Alban Delmonte, B. Atkins, C. B. Chewings, J. M. Andersson, P. |
author_sort |
Winton, V. H. L. |
title |
The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
title_short |
The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
title_full |
The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
title_fullStr |
The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
title_full_unstemmed |
The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica |
title_sort |
contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern ross sea, antarctica |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
https://orca.cardiff.ac.uk/id/eprint/91587/ https://doi.org/10.1002/2013GB004574 |
geographic |
McMurdo Sound Ross Sea |
geographic_facet |
McMurdo Sound Ross Sea |
genre |
Antarc* Antarctica McMurdo Sound Ross Sea Sea ice |
genre_facet |
Antarc* Antarctica McMurdo Sound Ross Sea Sea ice |
op_relation |
Winton, V. H. L., Dunbar, G. B., Bertler, N. A. N., Millet, Marc-Alban https://orca.cardiff.ac.uk/view/cardiffauthors/A2249319T.html orcid:0000-0003-2710-5374 orcid:0000-0003-2710-5374, Delmonte, B., Atkins, C. B., Chewings, J. M. and Andersson, P. 2014. The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica. Global Biogeochemical Cycles 28 (4) , pp. 423-436. 10.1002/2013GB004574 https://doi.org/10.1002/2013GB004574 doi:10.1002/2013GB004574 |
op_doi |
https://doi.org/10.1002/2013GB004574 |
container_title |
Global Biogeochemical Cycles |
container_volume |
28 |
container_issue |
4 |
container_start_page |
423 |
op_container_end_page |
436 |
_version_ |
1766271741489840128 |