Sökning: "Lakes"

Visar resultat 1 - 5 av 316 avhandlingar innehållade ordet Lakes.

  1. 1. Carbon trace gas dynamics in subarctic lakes

    Detta är en avhandling från Stockholm : Department of Geological Sciences, Stockholm University

    Författare :Joachim Jansen; Patrick Crill; Andreas Lorke; [2020]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lakes; methane; carbon dioxide; fluxes; gas transfer; proxy; climate change; geokemi; Geochemistry;

    Sammanfattning : Northern lakes are important sources of greenhouse gases carbon dioxide and methane to the atmosphere. Emissions are expected to increase as the climate continues to warm. Even so, lake carbon budgets are currently poorly constrained. This is in part because of a limited understanding of the processes that govern the flux. LÄS MER

  2. 2. Phosphatases in lakes : characterization, activity and ecological implications

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Håkan Olsson; [1988]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  3. 3. Predictive Modelling of Heavy Metals in Urban Lakes

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Martin Lindström; [2000]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Predictive modelling; heavy metals; lakes; urban influences; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; Sedimentology; sedimentologi;

    Sammanfattning : Heavy metals are well-known environmental pollutants. In this thesis predictive models for heavy metals in urban lakes are discussed and new models presented. The base of predictive modelling is empirical data from field investigations of many ecosystems covering a wide range of ecosystem characteristics. LÄS MER

  4. 4. Food Quality for Zooplankton in Humic Lakes

    Detta är en avhandling från Lund University, Ecology Department/ Limnology

    Författare :Kelly Gutseit; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; limnology; Hydrobiology; marine biology; Clear water lakes; Plankton; Seston; Elements; Fatty acids; Humic lakes; Food quality; Zooplankton; limnologi; akvatisk ekologi; aquatic ecology; Marinbiologi;

    Sammanfattning : Food quality affects growth, reproduction and community structure of zooplankton, and has implications for nutrient cycling and the transfer of energy and matter in aquatic food chains. While the issue of food quality in clear water lakes has received great recent attention, studies on food quality for zooplankton in humic lakes are scarce. LÄS MER

  5. 5. Greenhouse Gas Dynamics in Ice-covered Lakes Across Spatial and Temporal Scales

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Blaize Amber Denfeld; Gesa Weyhenmeyer; Kimberly Wickland; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; carbon cycle; climate change; cryosphere; carbon dioxide; methane; lakes; winter limnology; methane oxidation; nutrients; catchment; Limnologi; Limnology;

    Sammanfattning : Lakes play a major role in the global carbon (C) cycle, despite making up a small area of earth’s surface. Lakes receive, transport and process sizable amounts of C, emitting a substantial amount of the greenhouse gases, carbon dioxide (CO2) and methane (CH4), into the atmosphere. LÄS MER