Sökning: "CH₄ flux"

Visar resultat 11 - 15 av 28 uppsatser innehållade orden CH₄ flux.

  1. 11. Methane flux in the Doñana wetlands : Waterbird guano addition and benthicinvertebrate effects

    Magister-uppsats,

    Författare :Noa Ratia; [2019]
    Nyckelord :aquatic invertebrates; bottom-up effects; CH4; Doñana; greenhouse gases; mesocosm; methane; sediment cores; akvatiska evertebrater; bottom-up effekter; CH4; Doñana; mesokosm; metan; sedimentkärnor; växthusgaser;

    Sammanfattning : Wetlands are globally important biogeochemical hotspots, and their roles as either significant sources of greenhouse gas or carbon sinks are strongly controlled by environmental drivers such as carbon, nitrogen, and phosphorus availability, which can stimulate emission of three greenhouse gases: nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4). Mounting evidence suggests that aquatic invertebrate activity can enhance wetland greenhouse gas flux, through bioturbation and bioirrigation of surrounding sediments. LÄS MER

  3. 12. Methane fluxes in lakes at different spatiotemporal scales

    Kandidat-uppsats, Linköpings universitet/Institutionen för tema

    Författare :Erik Hallgren; Olle Åman; [2019]
    Nyckelord :Methane; Variability; Small-lakes; Floating Chamber; Spatial Temporal; Greenhouse gas; Metan; Variabilitet; Sjöar; Spatial; Temporal; Flöden; Växthusgas;

    Sammanfattning : Freshwater bodies such as lakes release the greenhouse gas methane (CH4) into the atmosphere. Global emissions from lakes are estimated to emit more CH4 than oceans, despite that lakes occupies a much smaller global land area. Lakes are therefore significant components for global budgets of CH4. LÄS MER

  4. 13. Methane fluxes from tree stems in Amazon floodplains : Evaluating methodological aspect of measuring spatial and seasonal variability in a flooded system

    Kandidat-uppsats, Linköpings universitet/Tema Miljöförändring

    Författare :felicia Widing; Nina Rubensson; [2018]
    Nyckelord :CH4; Tree stems; Amazon floodplain forest; Wetlands; flux; Solimões; Negro; Tapajós;

    Sammanfattning : Träd i tropiska våtmarker har uppmärksammats som en viktig källa till regionala och globala metan (CH4) utsläpp, då träd fungerar som utsläppskanaler för metan som bildas i sedimenten. Dock finns det en osäkerhet gällande säsongsvariation och rumslig variation samt mängden CH4 utsläpp från träd, eftersom kunskapen kring regionala flöden är begränsad. LÄS MER

  5. 14. Methane flux from Carex ramenskii on coastal meadows and grazing lawns in western Alaska

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

    Författare :Kaj Lynöe; [2017]
    Nyckelord :Arctic wetlands; Greenhouse gases; CH4 emission; Plant mediated gas release; Geese grazing;

    Sammanfattning : In this study we determined the magnitude of plant mediated CH4 emission (flux) in two vegetation types of Carex ramenskii. The objectives of this paper were to quantify the proportion of CH4 emissions from plant mediated flux and the total flux (plant and soil). LÄS MER

  7. 15. Methods of measuring GHG fluxes at a full-scale Swedish WWTP: : A focus on nitrous oxide, methane and carbon dioxide in the SHARON treatment

    Kandidat-uppsats, Linköpings universitet/Tema Miljöförändring

    Författare :Sjögren Jimmy; Enhäll Elin; [2017]
    Nyckelord :Wastewater treatment; SHARON; nitrious oxide; methane; carbon dioxide; greenhouse gas emission; flux chamber; gas sensors;

    Sammanfattning : The Stable high rate ammonia removal over nitrite (SHARON) at Nykvarnsverket in Linköping is a relatively new kind of biological treatment. Fluxes of nitrous oxide (N2O) has not been fully mapped at Nykvarnsverket and additional efforts are needed for increased knowledge about possible emissions. LÄS MER