Sökning: "Lakes"

Visar resultat 16 - 20 av 381 avhandlingar innehållade ordet Lakes.

  1. 16. The role of inland waters in the carbon cycle at high latitudes

    Författare :Erik Lundin; Jan Karlsson; Reiner Giesler; Robert Striegl; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lakes; streams; carbon C ; carbon dioxide CO2 ; methane CH4 ; dissolved inorganic carbon DIC ; boreal; sub-arctic; arctic; emission; sediments; burial; budget; limnologi; Limnology; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys; naturgeografi; Physical Geography;

    Sammanfattning : Understanding the drivers of climate change requires knowledge about the global carbon (C) cycle. Although inland waters play an important role in the C cycle by emitting and burying C, streams and lakes are in general overlooked in bottom-up approached C budgets. LÄS MER

  3. 17. Aqueous geochemistry of pit lakes : two cases studies at Rävlidmyran and Udden, Sweden

    Författare :Lu Ming; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Two abandoned pit lakes in northern Sweden were studied in order to improve the understanding of the geochemistry of pit lakes, Rävlidmyran Pit Lake and Udden Pit Lake. Both lakes show strong similarity with other mining lakes in terms of low pH and high metal and sulphate contents. LÄS MER

  4. 18. Local and global contaminants in Swedish waters : studies on PCBs, DDTs, 4,5,6-trichloroguaiacol and their transformation products in fish and sediments

    Författare :Maria Söderström; Åke Bergman; Bert van Bavel; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PCB; DDT; HCB; trichloroguaiacol; transformation products; dimerisation; bromination; environmental pollutants; eutrophication; lakes; fresh water; baltic sea; monitoring; sediments; fish; phytoplankton; PCB; DDT; HCB; triklorguajakol; omvandlingsprodukter; dimerisering; bromering; miljöföroreningar; eutrofiering; sjöar; sötvatten; östersjön; miljöövervakning; sediment; fisk; fytoplankton; miljökemi; Environmental Chemistry;

    Sammanfattning : This thesis is focused on studies on the environmental fate and methodological improvements for determination of the global contaminants, PCBs and DDTs, and locally discharged phenolics, e.g. 4,5,6-trichloroguaiacol (4,5,6-TCG), and their transformation products. LÄS MER

  5. 19. Lake Dissolved Organic Matter Quantity and Quality : Variability across Temporal and Spatial Scales

    Författare :Roger André Müller; Gesa Weyhenmeyer; Emily Stanley; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dissolved organic matter; organic carbon; CDOM; lakes; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

    Sammanfattning : Surface waters receive large amounts of dissolved organic matter (DOM) via runoff from land. The DOM is rich in organic carbon that serves as an energy source for the aquatic biota. During uptake of this energy, aquatic organisms mineralize organic carbon. LÄS MER

  7. 20. Benthic-Pelagic Microbial Interactions and Carbon Cycling in Clearwater Lakes

    Författare :Eva Andersson; Anna-Kristina Brunberg; Lars Tanvik; Kristina Sundbäck; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; microphytobenthos; phytoplankton; heterotrophic bacteria; interactions; nutrients; carbon cycling; clearwater lakes; Biologi; Biology; Biologi;

    Sammanfattning : This thesis focuses on the interactions among microbiota in clearwater lakes. Field sampling and field experiments were performed to evaluate interactions among microbiota and the importance of benthic versus pelagic microbiota in terms of biomass and production. In addition, carbon cycling in an oligotrophic clearwater lake was calculated. LÄS MER