Search for dissertations about: "biogeokemi"

Showing result 1 - 5 of 10 swedish dissertations containing the word biogeokemi.

  1. 1. The role of sediments in the biogeochemical cycles of nutrients in the Gulf of Riga

    University dissertation from Stockholm : Stockholm University

    Author : Juris Aigars; Stockholms universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biogeokemi; Biogeochemistry;

    Abstract : The sediment biogeochemistry of C, N, P and biologic silica (BSi) plays an important role in cycling of these elements in aquatic ecosystems. In shallow coastal and estuarine systems, water-sediment nutrient dynamics can influence biological processes (e.g., primary production) in overlying waters. READ MORE

  2. 2. The geochemistry of two selected areas of the deep sea, the TAG hydrothermal mound, Mid-Atlantic Ridge and the Lomonosov Ridge, central Arctic Ocean

    University dissertation from Stockholm : Stockholm University

    Author : Hakam Al-Hanbali; Stockholms universitet.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biogeokemi; Biogeochemistry;

    Abstract : .... READ MORE

  3. 3. Hydrothermal alteration of organic matter at spreading centers

    University dissertation from Stockholm : Department of Geology and Geochemistry, Stockholm University

    Author : Eva Andersson; Stockholms universitet.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; biogeokemi; Biogeochemistry;

    Abstract : Alteration of organic matter, mainly amino acids, at sub-seafloor hydrothermal conditions has been investigated by performing laboratory experiments and by studying deep-sea sediments from hydrothermally active areas on the northern Juan de Fuca Ridge, northeast Pacific Ocean.Quaternary sediments from Middle Valley and the eastern flank of the Juan de Fuca Ridge recovered during the Ocean Drilling Program Legs 139 and 168 have been analyzed for total hydrolyzable amino acid concentrations, individual amino acid abundances and stereochemistry in order to evaluate the effects of hydrothermal stress on the decomposition of sedimentary amino acids. READ MORE

  4. 4. Benthic metabolism and sediment nitrogen cycling in Baltic sea coastal areas the role of eutrophication, hypoxia and bioturbation

    University dissertation from Department of Geological Sciences, Stockholm Univeristy

    Author : Stefano Bonaglia; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Eutrophication; Sediment; Benthic Flux; Nitrogen Cycle; Denitrification; Baltic Sea; Biogeochemistry; biogeokemi; marin- och brackvattensekologi; Marine and Brackish Water Ecology; marin ekologi; Marine Ecology; geokemi; Geochemistry;

    Abstract : Eutrophication is one of the greatest threats for the Baltic Sea, and one of its more critical consequences is bottom water hypoxia. Nutrient enrichment and oxygen-depletion affect both the deep central basins and a number of coastal areas, even though strategies for nutrient reduction have lately been implemented. READ MORE

  5. 5. Organic geochemical investigation of sources, transport and fate of terrestrial organic matter in the southeast Laptev Sea

    University dissertation from Frescati, Stockholm : Stockholm University

    Author : Emma Karlsson; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; biogeokemi; Marine Geoscience; marin geovetenskap; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Permafrost carbon stores have been suggested to react to warming trends with increased terrestrial loading to its coastal waters. Presently, the warming has been seen to be especially high in the East Siberian Arctic and the fate of the major release of terrestrial matter to these coasts is yet to be detailed. READ MORE