Cristin-resultat-ID: 2053251
Sist endret: 4. november 2022, 08:49
Resultat
Poster
2022

The influence of hydrology on methane production in sediments of subarctic lakes

Bidragsytere:
  • Marie Bulinová
  • Alexandra Rouillard
  • Giuliana Panieri og
  • Anders Schomacker

Presentasjon

Navn på arrangementet: Methane in a changing Arctic
Sted: Tromsø, Norway
Dato fra: 14. september 2022
Dato til: 16. september 2022

Om resultatet

Poster
Publiseringsår: 2022

Beskrivelse Beskrivelse

Tittel

The influence of hydrology on methane production in sediments of subarctic lakes

Sammendrag

Northern lakes are globally significant sources of atmospheric methane (CH4) and are especially sensitive to environmental changes. Due to ongoing climate change (e.g., increasing mean annual air temperature, changes in precipitation and seasonality), many Arctic and subarctic lakes are at risk of transitioning from a clearwater into a brown-water state. However, little is known about the direct effects of this transition on the CH4 cycle in lake sediments. Here, we seek to improve our understanding of methane related processes in Arctic lake sediments to help to improve the predictions of future CH4 emissions from Arctic lakes. Through high-resolution sampling of lake sediment cores, we investigate sediment CH4-production responses to various hydrology and landscape variables. We collected short lacustrine surface sediment cores (40-60 cm) using a gravity corer from two sets of lakes with different hydrology. One set is located in northern Norway (4 lakes: Troms area); the other, following a precipitation gradient increasing from the coast towards inland in northern Sweden (3 lakes: Abisko area). We focus on the catchment-to-lake area ratio, which has a potential for organic carbon transport; the steepness of catchment, vegetation cover, elevation, annual precipitation, bathymetry of each lake, groundwater discharge and other possible physical and chemical properties of the lakes. We explore the potential to predict variability in sediment CH4 concentrations from different variables (landscape and hydrology factors, sediment depth, total organic carbon (TOC), δ13C-TOC, dissolved inorganic carbon (DIC), δ13C-DIC). Our preliminary results indicate most variability in sediment CH4 concentration may be related to the groundwater input, however the lowest CH4 concentration was measured from a glacial meltwater-fed lake. Overall, CH4 concentration is stable below the upper 30 cm of sediment, whereas in this upper interval, we observe a decrease in CH4 concentration caused by CH4 consumption

Bidragsytere

Marie Bulinová

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Alexandra Rouillard

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Giuliana Panieri

  • Tilknyttet:
    Forfatter
    ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet

Anders Schomacker

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet
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