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| Titel |
Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay |
| VerfasserIn |
A. Laës, S. Blain, P. Laan, S. J. Ussher, E. P. Achterberg, P. Tréguer, H. J. W. Baar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 4, no. 2 ; Nr. 4, no. 2 (2007-03-14), S.181-194 |
| Datensatznummer |
250001617
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| Publikation (Nr.) |
 copernicus.org/bg-4-181-2007.pdf |
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| Zusammenfassung |
| Dissolved iron (DFe; <0.2 µm) and dissolved manganese (DMn; <0.2 µm) concentrations were determined in the water column of the Bay of
Biscay (eastern North Atlantic Ocean) in March 2002. The samples were
collected along a transect traversing from the European continental shelf
over the continental slope. The highest DFe and DMn concentrations (2.39 nM
and 6.10 nM, respectively) were observed in the bottom waters on the shelf
at stations closest to the coast. The release of trace metal from
resuspended particles and the diffusion from pore waters were
probably at the origin of elevated DFe and DMn concentrations in the Bottom
Boundary Layer (BBL). In the slope region, the highest total dissolvable
iron (TDFe), DFe and DMn values (24.6 nM, 1.58 nM and 2.12 nM, respectively)
were observed close to the bottom at depth of ca.~600–700 m. Internal wave
activity and slope circulation are thought to be at the origin of this
phenomenon. These processes were also very likely the cause of elevated
concentrations (DFe: 1.27 nM, DMn: 2.34 nM) measured in surface waters of
stations located in the same area. At stations off the continental slope,
the vertical distribution of both metals were typical of open ocean
conditions, indicating that inputs from the continental margin did not
impact the metal distributions in the offshore waters. |
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