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| Titel |
Dissolved iron (II) in the Baltic Sea surface water and implications for cyanobacterial bloom development |
| VerfasserIn |
E. Breitbarth, J. Gelting, J. Walve, L. J. Hoffmann, D. R. Turner, M. Hassellöv, J. Ingri |
| 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 ; 6, no. 11 ; Nr. 6, no. 11 (2009-11-04), S.2397-2420 |
| Datensatznummer |
250004082
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| Publikation (Nr.) |
 copernicus.org/bg-6-2397-2009.pdf |
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| Zusammenfassung |
| Iron chemistry measurements were conducted during summer 2007 at two
distinct locations in the Baltic Sea (Gotland Deep and Landsort Deep) to
evaluate the role of iron for cyanobacterial bloom development in these
estuarine waters. Depth profiles of Fe(II) were measured by chemiluminescent
flow injection analysis (CL-FIA). Up to 0.9 nmol Fe(II) L−1 were
detected in light penetrated surface waters, which constitutes up to 20%
to the dissolved Fe pool. This bioavailable iron source is a major
contributor to the Fe requirements of Baltic Sea phytoplankton and
apparently plays a major role for cyanobacterial bloom development during
our study. Measured Fe(II) half life times in oxygenated water exceed
predicted values and indicate organic Fe(II) complexation. Potential sources
for Fe(II) ligands, including rainwater, are discussed. Fe(II)
concentrations of up to 1.44 nmol L−1 were detected at water depths
below the euphotic zone, but above the oxic anoxic interface. Mixed layer
depths after strong wind events are not deep enough in summer time to
penetrate the oxic-anoxic boundary layer. However, Fe(II) from anoxic bottom
water may enter the sub-oxic zone via diapycnal mixing and diffusion. |
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