Sökning: "CH₄ flux"

Visar resultat 16 - 20 av 28 uppsatser innehållade orden CH₄ flux.

  1. 16. The impact of permafrost degradation on methane fluxes : a field study in Abisko

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Andreas Dahlbom; [2016]
    Nyckelord :Physical Geography and Ecosystem analysis; methane; chamber technique; permafrost; Abisko; Earth and Environmental Sciences;

    Sammanfattning : All over the arctic and sub-arctic region global warming is affecting permafrost. When permafrost thaws, organic material becomes available for decomposition, hence an increase of greenhouse gas emissions to the atmosphere. In the northernmost of Sweden, on a mire close to Abisko, a snow manipulation project is ongoing. LÄS MER

  3. 17. Diffusive gas fluxes in neotropical rainforest streams

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Björn Skoglund; [2015]
    Nyckelord :Carbon dioxide; diffusive flux; tropics; greenhouse gas; rainforest;

    Sammanfattning : Rainforests are of great importance to global carbon cycling, but the importance of deforestation and change in land use is poorly understood due to a lack of studies quantifying the difference in carbon fluxes between original rainforest and agricultural land. Furthermore, the aquatic outgassing of neotropical systems have been proven to have greater impact on global carbon cycling than previously anticipated (Richey et al 2002). LÄS MER

  4. 18. Variability of GHG emissions from emergent aquatic macrophytes in mixed boreal and Equisetum dominated communities

    Kandidat-uppsats, Linköpings universitet/Tema Miljöförändring; Linköpings universitet/Filosofiska fakulteten

    Författare :Nina Marliden; [2015]
    Nyckelord :plant-mediated; GHG flux; methane; carbon dioxide; nitrous oxide; Equisetum fluviatile; wetland; lake;

    Sammanfattning : Plants (macrophytes) growing in lake and wetland sediments are known mediators of greenhouse gases (GHG), specifically methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2O). Current studies have emphasized the potential risk of underestimation regarding emissions of plant-mediated GHGs from terrestrial systems including lakes, streams and other freshwater bodies. LÄS MER

  5. 19. The importance of winter for carbon emissions from boreal lakes

    Master-uppsats, Institutionen för ekologi, miljö och geovetenskap

    Författare :Cecilia Larsson; [2013]
    Nyckelord :Carbon dioxide; methane; winter accumulation; boreal lakes; dissolved organic carbon;

    Sammanfattning : The aim of this study was to investigate the importance of winter season for the production of carbon dioxide (CO2) and methane (CH4) in humic and clear-water boreal aquatic systems. The study was conducted in 16 experimental ponds in northern Sweden during the winter of 2013. LÄS MER

  7. 20. Utsläpp av växthusgaser under islossning i små boreala sjöar

    Kandidat-uppsats, Institutionen för ekologi, miljö och geovetenskap

    Författare :Martin Tarberg; [2013]
    Nyckelord :emission; carbon dioxide; methane; boreal lake; ice-thaw;

    Sammanfattning : Freshwater ecosystems have long been neglected as an important part of the global carbon cycle. However, research shows that most of the world’s lakes are net-heterotrophic and consequently emitters of greenhouse gases to the atmosphere. LÄS MER