Sökning: "CH₄ flux"

Visar resultat 1 - 5 av 19 uppsatser innehållade orden CH₄ flux.

  1. 1. Greenhoue gas flux over a 50-year post permafrost thaw gradient. Decomposition of soil organic carbon from the Swedish tussock tundra.

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Johan Martinelli; [2020-02-11]
    Nyckelord :greenhouse gas; permafrost;

    Sammanfattning : As the globe is warming the extent of permafrost drastically decreases in the high latitudes. Upon thawthe stored soil organic carbon (SOC) undergoes rapid decomposition and is partly released as trace gasesto the atmosphere. LÄS MER

  2. 2. Variability of summer CH4 and CO2 flux rates in and between three large Swedish lakes : A spatio-temporal field study

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

    Författare :Isak Nilsson; Filip Seifarth; [2020]
    Nyckelord :Large lakes; Freshwater; Flux chambers; Emissions; Ebullition; Diffusion; Carbon cycle; Carbon budget; Methane budget; Greenhouse gases; GHGs; Methane; CH4; Carbon dioxide; CO2; Variability; Spatial; Temporal; Stora sjöar; sötvatten; flödeskammare; utsläpp; bubblor; diffusion; kolcykel; kolbudget; metanbudget; växthusgaser; metan; CH4; koldioxid; CO2; variabilitet; rumslig; tidsmässig;

    Sammanfattning : Understanding of natural greenhouse gas (GHG) cycles is crucial for making GHG budgets, which work as basis in climate change and global warming policy programs. Lakes as a source for GHG activity have only recently been included in global GHG budgets, and most studies of lake GHG flux rates are conducted on lakes <10 km2, which only comprise roughly half of the global lake area—making data of large lake flux rates scarce. LÄS MER

  3. 3. 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

  4. 4. Methane fluxes in lakes at different spatiotemporal scales

    Kandidat-uppsats, Linköpings universitet/Institutionen för tema; 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

  5. 5. 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; 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