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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03634naa a2200385 4500 | |
| 001 | oai:DiVA.org:ltu-3606 | |
| 003 | SwePub | |
| 008 | 160929s2010 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-36062 URI |
| 024 | 7 | a https://doi.org/10.5194/bg-7-2489-20102 DOI |
| 040 | a (SwePub)ltu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Gelting, Johan4 aut |
| 245 | 1 0 | a Fractionation of iron species and iron isotopes in the Baltic Sea euphotic zone |
| 264 | c 2010-08-23 | |
| 264 | 1 | b Copernicus GmbH,c 2010 |
| 338 | a print2 rdacarrier | |
| 500 | a Validerad; 2010; 20101102 (jgn) | |
| 520 | a To indentify sources and transport mechanisms of iron in a coastal marine environment, we conducted measurements of the physiochemical speciation of Fe in the euphotic zone at three different locations in the Baltic Sea. In addition to sampling across a salinity gradient, we conducted this study over the spring and summer season. Moving from the riverine input characterized low salinity Bothnian Sea, via the Landsort Deep near Stockholm, towards the Gotland Deep in the Baltic Proper, total Fe concentrations averaged 114, 44, and 15 nM, respectively. At all three locations, a decrease in total Fe of 80-90% from early spring to summer was observed. Particulate Fe (PFe) was the dominating phase at all stations and accounted for 75-85% of the total Fe pool on average. The Fe isotope composition (δ 56Fe) of the PFe showed constant positive values in the Bothnian Sea surface waters (+0.08 to +0.20‰). Enrichment of heavy Fe in the Bothnian Sea PFe is possibly associated to input of aggregated land derived Fe-oxyhydroxides and oxidation of dissolved Fe(II). At the Landsort Deep the isotopic fractionation of PFe changed between -0.08‰ to +0.28‰ over the sampling period. The negative values in early spring indicate transport of PFe from the oxic-anoxic boundary at ∼80 m depth. The average colloidal iron fraction (CFe) showed decreasing concentrations along the salinity gradient; Bothnian Sea 15 nM; Landsort Deep 1 nM, and Gotland Deep 0.5 nM. Field Flow Fractionation data indicate that the main colloidal carrier phase for Fe in the Baltic Sea is a carbon-rich fulvic acid associated compound, likely of riverine origin. A strong positive correlation between PFe and chl-a indicates that cycling of suspended Fe is at least partially controlled by primary production. However, this relationship may not be dominated by active uptake of Fe into phytoplankton, but instead may reflect scavenging and removal of PFe during phytoplankton sedimentation. | |
| 650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng |
| 653 | a Applied Geology | |
| 653 | a Tillämpad geologi | |
| 700 | 1 | a Breitbarth, Eike4 aut |
| 700 | 1 | a Stolpe, B.u University of Gothenburg4 aut |
| 700 | 1 | a Hassellöv, M.u University of Gothenburg4 aut |
| 700 | 1 | a Ingri, Johanu Luleå tekniska universitet,Geovetenskap och miljöteknik4 aut0 (Swepub:ltu)join |
| 710 | 2 | a University of Gothenburgb Geovetenskap och miljöteknik4 org |
| 773 | 0 | t Biogeosciencesd : Copernicus GmbHg 7:8, s. 2489-2508q 7:8<2489-2508x 1726-4170x 1726-4189 |
| 856 | 4 | u https://www.biogeosciences.net/7/2489/2010/bg-7-2489-2010.pdf |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-3606 |
| 856 | 4 8 | u https://doi.org/10.5194/bg-7-2489-2010 |
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