Sökning: "Nutrient runoff"

Visar resultat 21 - 25 av 26 avhandlingar innehållade orden Nutrient runoff.

  1. 21. Late Miocene to Pliocene orbital and climatic forcing on marine productivity

    Författare :Boris-Theofanis Karatsolis; Jorijntje Henderiks; Thomas Stevens; David De Vleeschouwer; Clara T. Bolton; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The late Miocene to Pliocene was a geological time interval of global cooling, albeit in a warmer-than-present world, which is commonly used as a past analogue for future anthropogenic climate change. The investigation of marine sediments recovered by the International Ocean Discovery Program (IODP) sheds light on different paleoclimatic, paleoceanographic and paleobiological characteristics of this period. LÄS MER

  3. 22. Bacterioplankton in the Baltic Sea : influence of allochthonous organic matter and salinity

    Författare :Daniela Figueroa; Agneta Andersson; Laura Alonso-Saéz; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bacterioplankton production; bacterial community structure; allochthonous organic matter; carbon utilization; dissolved organic carbon composition; bacterioplankton ecological function; bacterial diversity; bacterial network; Baltic Sea estuary; food web; climate change.; Environmental Science; miljövetenskap;

    Sammanfattning : Climate change is expected to increase the precipitation ~30% in higher latitudes during the next century, increasing the land runoff via rivers to aquatic ecosystems. The Baltic Sea will receive higher river discharges, accompanied by larger input of allochthonous dissolved organic matter (DOM) from terrestrial ecosystems. LÄS MER

  4. 23. Nonpoint source water pollution management : Monitoring, assessment and wetland treatment

    Författare :Lorin Reinelt; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The management of nonpoint (diffuse) sources of-water pollution has received increased attention during the past decade. New techniques that aid in the identification and assessment of these diffuse sources can increase the chances for success of nonpoint source control efforts. LÄS MER

  5. 24. Fluxes and transformation of carbon in the Siberian shelf seas under changing environment

    Författare :Irene Wåhlström; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon system; Carbon dioxide; Arctic Ocean; Siberian shelf seas; Climate change;

    Sammanfattning : The Arctic is especially vulnerable to the increased air temperature caused by emissions of greenhouse gases to the atmosphere, carbon dioxide being one of them. In this thesis, both fieldwork and modelling of the East Siberian Arctic Shelf (the Laptev Sea and the East Siberian Sea) have been carried out to investigate the carbon system in this region. LÄS MER

  7. 25. Remediation of mercury contaminated soil and biological mercury methylation in the landscape

    Författare :Jingying Xu; Stefan Bertilsson; Andrea Garcia Bravo; Dario Acha; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mercury contamination; Soil remediation; Methylmercury; Mercury methylation; hgcA; Community composition; Bacteria; Landscape; Biologi med inriktning mot mikrobiologi; Biology with specialization in Microbiology;

    Sammanfattning : Accumulation of mercury (Hg) in soil originating from both natural and anthropogenic sources poses a major hazard to environmental and human health. Inorganic Hg(II) in soil can be transformed to highly toxic methylmercury (MeHg) mainly via methylating microorganisms. LÄS MER