Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre
[1] Distributions of total dissolvable iron (TDFe; unfiltered), dissolved iron (DFe; 0.2 mu m filtered), and soluble iron (SFe; 0.02 mu m filtered) were investigated during the BONUS-GoodHope cruise in the Atlantic sector of the Southern Ocean (34 degrees S/17 degrees E-57 degrees S/0 degrees, Febru...
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ftarchimer:oai:archimer.ifremer.fr:12808 2023-05-15T13:47:21+02:00 Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre Chever, Fanny Bucciarelli, Eva Sarthou, G. Speich, Sabrina Arhan, Michel Penven, Pierrick Tagliabue, A. 2010-10 application/pdf https://archimer.ifremer.fr/doc/00017/12808/9763.pdf https://doi.org/10.1029/2009JC005880 https://archimer.ifremer.fr/doc/00017/12808/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00017/12808/9763.pdf doi:10.1029/2009JC005880 https://archimer.ifremer.fr/doc/00017/12808/ 2010. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2010-10 , Vol. 115 , P. 1-15 text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.1029/2009JC005880 2021-09-23T20:18:45Z [1] Distributions of total dissolvable iron (TDFe; unfiltered), dissolved iron (DFe; 0.2 mu m filtered), and soluble iron (SFe; 0.02 mu m filtered) were investigated during the BONUS-GoodHope cruise in the Atlantic sector of the Southern Ocean (34 degrees S/17 degrees E-57 degrees S/0 degrees, February-March 2008). In the mixed layer, mean values of 0.43 +/- 0.28 and 0.22 +/- 0.18 nmol L-1 were measured for TDFe and DFe, respectively. In deeper waters, TDFe and DFe concentrations were 1.07 +/- 0.68 and 0.52 +/- 0.30 nmol L-1, respectively. DFe concentrations decreased from the north (subtropical waters) to the south (Weddell Sea Gyre). In the subtropical domain, dusts coming from Patagonia and southern Africa and inputs from the African continental margin may explain high DFe and TDFe concentrations in surface and intermediate waters. Results from numerical models gave support to these hypotheses. In the Antarctic Circumpolar Current domain, estimation of the median advective time of water masses suggests that sediment inputs from the Antarctic Peninsula, South America margin, and/or South Georgia Islands could be an important source of Fe. Except in the subtropical domain where 0.4-0.6 nmol L-1 of SFe were observed in the upper 1500 m, all stations exhibited values close to 0.1-0.2 nmol L-1 in surface and 0.3-0.5 nmol L-1 in deeper waters. For all stations, colloidal Fe (CFe) was a minor fraction of DFe in surface waters and increased with depth. Colloidal aggregation, sinking of CFe, and assimilation of SFe, followed by rapid exchange between the two fractions, are suspected to occur. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Antarctic Peninsula Patagonia Southern Ocean The Antarctic Weddell Weddell Sea Journal of Geophysical Research: Oceans 115 C10 |
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Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
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ftarchimer |
language |
English |
description |
[1] Distributions of total dissolvable iron (TDFe; unfiltered), dissolved iron (DFe; 0.2 mu m filtered), and soluble iron (SFe; 0.02 mu m filtered) were investigated during the BONUS-GoodHope cruise in the Atlantic sector of the Southern Ocean (34 degrees S/17 degrees E-57 degrees S/0 degrees, February-March 2008). In the mixed layer, mean values of 0.43 +/- 0.28 and 0.22 +/- 0.18 nmol L-1 were measured for TDFe and DFe, respectively. In deeper waters, TDFe and DFe concentrations were 1.07 +/- 0.68 and 0.52 +/- 0.30 nmol L-1, respectively. DFe concentrations decreased from the north (subtropical waters) to the south (Weddell Sea Gyre). In the subtropical domain, dusts coming from Patagonia and southern Africa and inputs from the African continental margin may explain high DFe and TDFe concentrations in surface and intermediate waters. Results from numerical models gave support to these hypotheses. In the Antarctic Circumpolar Current domain, estimation of the median advective time of water masses suggests that sediment inputs from the Antarctic Peninsula, South America margin, and/or South Georgia Islands could be an important source of Fe. Except in the subtropical domain where 0.4-0.6 nmol L-1 of SFe were observed in the upper 1500 m, all stations exhibited values close to 0.1-0.2 nmol L-1 in surface and 0.3-0.5 nmol L-1 in deeper waters. For all stations, colloidal Fe (CFe) was a minor fraction of DFe in surface waters and increased with depth. Colloidal aggregation, sinking of CFe, and assimilation of SFe, followed by rapid exchange between the two fractions, are suspected to occur. |
format |
Article in Journal/Newspaper |
author |
Chever, Fanny Bucciarelli, Eva Sarthou, G. Speich, Sabrina Arhan, Michel Penven, Pierrick Tagliabue, A. |
spellingShingle |
Chever, Fanny Bucciarelli, Eva Sarthou, G. Speich, Sabrina Arhan, Michel Penven, Pierrick Tagliabue, A. Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
author_facet |
Chever, Fanny Bucciarelli, Eva Sarthou, G. Speich, Sabrina Arhan, Michel Penven, Pierrick Tagliabue, A. |
author_sort |
Chever, Fanny |
title |
Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
title_short |
Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
title_full |
Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
title_fullStr |
Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
title_full_unstemmed |
Physical speciation of iron in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre |
title_sort |
physical speciation of iron in the atlantic sector of the southern ocean along a transect from the subtropical domain to the weddell sea gyre |
publisher |
Amer Geophysical Union |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00017/12808/9763.pdf https://doi.org/10.1029/2009JC005880 https://archimer.ifremer.fr/doc/00017/12808/ |
geographic |
Antarctic Antarctic Peninsula Patagonia Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
op_source |
Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2010-10 , Vol. 115 , P. 1-15 |
op_relation |
https://archimer.ifremer.fr/doc/00017/12808/9763.pdf doi:10.1029/2009JC005880 https://archimer.ifremer.fr/doc/00017/12808/ |
op_rights |
2010. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2009JC005880 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
115 |
container_issue |
C10 |
_version_ |
1766246958046904320 |