Distribution and redox speciation of dissolved iron on the European continental margin
To investigate the biogeochemistry of iron in the waters of the European continental margin, we determined the dissolved iron distribution and redox speciation in filtered (<0.2 μm) open-ocean and shelf waters. Depth profiles were sampled over the shelf slope southeast of the Chapelle Bank area (...
Published in: | Limnology and Oceanography |
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ASLO (Association for the Sciences of Limnology and Oceanography)
2007
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Online Access: | https://oceanrep.geomar.de/id/eprint/21778/ https://oceanrep.geomar.de/id/eprint/21778/1/2530.pdf https://doi.org/10.4319/lo.2007.52.6.2530 |
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ftoceanrep:oai:oceanrep.geomar.de:21778 2023-05-15T17:34:49+02:00 Distribution and redox speciation of dissolved iron on the European continental margin Ussher, S. J. Worsfold, P. J. Achterberg, Eric P. Laës, A. Blain, S. Laan, P. De Baar, H. J. W. 2007 text https://oceanrep.geomar.de/id/eprint/21778/ https://oceanrep.geomar.de/id/eprint/21778/1/2530.pdf https://doi.org/10.4319/lo.2007.52.6.2530 en eng ASLO (Association for the Sciences of Limnology and Oceanography) https://oceanrep.geomar.de/id/eprint/21778/1/2530.pdf Ussher, S. J., Worsfold, P. J., Achterberg, E. P. , Laës, A., Blain, S., Laan, P. and De Baar, H. J. W. (2007) Distribution and redox speciation of dissolved iron on the European continental margin. Limnology and Oceanography, 52 (6). pp. 2530-2539. DOI 10.4319/lo.2007.52.6.2530 <https://doi.org/10.4319/lo.2007.52.6.2530>. doi:10.4319/lo.2007.52.6.2530 Article PeerReviewed 2007 ftoceanrep https://doi.org/10.4319/lo.2007.52.6.2530 2023-04-07T15:10:01Z To investigate the biogeochemistry of iron in the waters of the European continental margin, we determined the dissolved iron distribution and redox speciation in filtered (<0.2 μm) open-ocean and shelf waters. Depth profiles were sampled over the shelf slope southeast of the Chapelle Bank area (47.61°N, 4.24°W to 46.00°N, 8.01°W) and a horizontal surface-water transect over the shelf and through the English Channel (la Manche) and the southern North Sea (46°N, 8°W to 52°N, 4°E). An abrupt trace-metal front was found near the shelf slope, indicated by a horizontal gradient of dissolved iron (DFe) and aluminium (DAl), which correlated with changing salinities (r2 = 0.572 and 0.528, respectively, n = 92). Labile Fe(II) concentrations varied from <12 pmol L-1 in North Atlantic surface waters to >200 pmol L-1 in the near bottom waters of the shelf break. Labile Fe(II) accounted for ∼5 of the dissolved iron species in surface shelf waters (mean 5.0 ± 2.7), whereas higher Fe(II) fractions (i.e., >8) were observed near the sea bottom on the shelf break and during a midday solar maximum in surface waters in the vicinity of the Scheldt river plume. Benthic processes (resuspension and diagenesis) constituted important sources of Fe(II) and DFe in this region, and photoreduction of Fe(III) species in shelf waters caused enhanced labile Fe(II) concentrations. These processes increased the lability of iron and its potential availability to marine organisms in the shelf ecosystem. © 2007, by the American Society of Limnology and Oceanography, Inc. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Limnology and Oceanography 52 6 2530 2539 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
To investigate the biogeochemistry of iron in the waters of the European continental margin, we determined the dissolved iron distribution and redox speciation in filtered (<0.2 μm) open-ocean and shelf waters. Depth profiles were sampled over the shelf slope southeast of the Chapelle Bank area (47.61°N, 4.24°W to 46.00°N, 8.01°W) and a horizontal surface-water transect over the shelf and through the English Channel (la Manche) and the southern North Sea (46°N, 8°W to 52°N, 4°E). An abrupt trace-metal front was found near the shelf slope, indicated by a horizontal gradient of dissolved iron (DFe) and aluminium (DAl), which correlated with changing salinities (r2 = 0.572 and 0.528, respectively, n = 92). Labile Fe(II) concentrations varied from <12 pmol L-1 in North Atlantic surface waters to >200 pmol L-1 in the near bottom waters of the shelf break. Labile Fe(II) accounted for ∼5 of the dissolved iron species in surface shelf waters (mean 5.0 ± 2.7), whereas higher Fe(II) fractions (i.e., >8) were observed near the sea bottom on the shelf break and during a midday solar maximum in surface waters in the vicinity of the Scheldt river plume. Benthic processes (resuspension and diagenesis) constituted important sources of Fe(II) and DFe in this region, and photoreduction of Fe(III) species in shelf waters caused enhanced labile Fe(II) concentrations. These processes increased the lability of iron and its potential availability to marine organisms in the shelf ecosystem. © 2007, by the American Society of Limnology and Oceanography, Inc. |
format |
Article in Journal/Newspaper |
author |
Ussher, S. J. Worsfold, P. J. Achterberg, Eric P. Laës, A. Blain, S. Laan, P. De Baar, H. J. W. |
spellingShingle |
Ussher, S. J. Worsfold, P. J. Achterberg, Eric P. Laës, A. Blain, S. Laan, P. De Baar, H. J. W. Distribution and redox speciation of dissolved iron on the European continental margin |
author_facet |
Ussher, S. J. Worsfold, P. J. Achterberg, Eric P. Laës, A. Blain, S. Laan, P. De Baar, H. J. W. |
author_sort |
Ussher, S. J. |
title |
Distribution and redox speciation of dissolved iron on the European continental margin |
title_short |
Distribution and redox speciation of dissolved iron on the European continental margin |
title_full |
Distribution and redox speciation of dissolved iron on the European continental margin |
title_fullStr |
Distribution and redox speciation of dissolved iron on the European continental margin |
title_full_unstemmed |
Distribution and redox speciation of dissolved iron on the European continental margin |
title_sort |
distribution and redox speciation of dissolved iron on the european continental margin |
publisher |
ASLO (Association for the Sciences of Limnology and Oceanography) |
publishDate |
2007 |
url |
https://oceanrep.geomar.de/id/eprint/21778/ https://oceanrep.geomar.de/id/eprint/21778/1/2530.pdf https://doi.org/10.4319/lo.2007.52.6.2530 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/21778/1/2530.pdf Ussher, S. J., Worsfold, P. J., Achterberg, E. P. , Laës, A., Blain, S., Laan, P. and De Baar, H. J. W. (2007) Distribution and redox speciation of dissolved iron on the European continental margin. Limnology and Oceanography, 52 (6). pp. 2530-2539. DOI 10.4319/lo.2007.52.6.2530 <https://doi.org/10.4319/lo.2007.52.6.2530>. doi:10.4319/lo.2007.52.6.2530 |
op_doi |
https://doi.org/10.4319/lo.2007.52.6.2530 |
container_title |
Limnology and Oceanography |
container_volume |
52 |
container_issue |
6 |
container_start_page |
2530 |
op_container_end_page |
2539 |
_version_ |
1766133764927258624 |