Title Dissolved iron (II) in the Baltic Sea surface water and implications for cyanobacterial bloom development
Author Breitbarth, E.; Gelting, J.; Walve, J.; Hoffmann, L.J.; Turner, D.R.; Hassellov, M.; Ingri, J.
Author Affil Breitbarth, E., University of Gothenburg, Department of Chemistry, Analytical and Marine Chemistry, Gothenburg, Sweden. Other: Lulea University of Technology, Sweden; Stockholms Universitet, Sweden
Source Biogeosciences, 6(11), p.2397-2420, . Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726- 4170
Publication Date 2009
Notes In English. Part of special issue no. 46, Iron biogeochemistry across marine systems at changing times, edited by Turner, D., Hunter, K., and Riebesell, U., http://www.biogeosciences.net/special_issue46.h tml; published in Biogeosciences Discussions: 6 April 2009, http://www.biogeosciences- discuss.net/6/3803/2009/bgd-6-3803-2009.html; accessed in Feb., 2011; abstract: doi:10.5194/bg-6-2397-2009. 123 refs. GeoRef Acc. No: 308339
Index Terms algae; precipitation (meteorology); diffusion; ocean environments; metals; plankton; salinity; Baltic Sea; algal blooms; Atlantic Ocean; atmospheric precipitation; biochemistry; biosphere; bottom water; chemiluminescent; cyanobacteria; dissolved materials; estuarine environment; ferrous iron; Gotland Deep; iron; irradiation; Landsort Deep; ligands; marine environment; mixing; North Atlantic; organic compounds; oxidation; phosphates; phytoplankton; Plantae; productivity; rates; sea surface water; sea water; seasonal variations; winds
Abstract 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.
URL http://www.biogeosciences.net/6/2397/2009/bg-6-2397-2009.pdf
Publication Type journal article
Record ID 65004963