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Citation link: https://doi.org/10.26092/elib/45
00103576-1.pdf
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Transformation processes of nitrogen, phosphorus and iron in sub-euphotic waters and surface sediments


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Other Titles: Transformationsprozesse von Stickstoff, Phosphor und Eisen in sub-euphotischem Wasser und Oberflächensedimenten
Authors: Sokoll, Sarah  
Supervisor: Kuypers, Marcel M. M. 
1. Expert: Kuypers, Marcel M. M. 
2. Expert: Zabel, Matthias  
Abstract: 
In the ocean, concentrations and ratios of nitrogen (N), phosphorus (P) and iron (Fe) determine primary production. In upwelling regions, nutrient-rich deep waters fuel this primary production. Knowledge of nutrient transformation processes in deep waters is still scarce. Therefore N-removal via denitrification and anaerobic ammonium oxidation (anammox) as well as P and Fe transformation processes were investigated. In the Arabian Sea up to 50% of N-loss was due to benthic N-removal, emphasizing the high potential of sediments to contribute to the N-deficit in the water column. In sandy permeable sediments off Mauritania, denitrification rates correlated with sediment grain size, indicating a strong relationship between benthic denitrification rates and advective porewater transport. On the shelf off Mauritania and Namibia, P-uptake was investigated in sub-euphotic waters and found to be largely biologically driven. In conclusion, transformation processes determine concentration and bioavailability of nutrients in the sub-euphotic water column and sediments and may eventually have an impact on the primary production in the surface ocean.
Keywords: nitrogen loss; phosphate uptake; nutrient cycling; sediment; benthic boundary layer; upwelling regions; oxygen minimum zones; stable isotopes; radiotracers; nirS functional genes
Issue Date: 20-Nov-2013
Type: Dissertation
DOI: 10.26092/elib/45
URN: urn:nbn:de:gbv:46-00103576-18
Institution: Universität Bremen 
Faculty: FB5 Geowissenschaften 
Appears in Collections:Dissertationen

  

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