WET HORIZONS

Part of EU Open Research Repository
Published January 16, 2025 | Version v1
Journal article Open

Air temperature and precipitation constraining the modelled wetland methane emissions in a boreal region in northern Europe

Creators

  • 1. ROR icon Finnish Meteorological Institute
  • 2. ROR icon CSC - IT Center for Science (Finland)
  • 3. ROR icon University of Bern
  • 4. ROR icon University of Exeter
  • 5. ROR icon Max Planck Institute for Meteorology
  • 6. ROR icon Norwegian University of Science and Technology
  • 7. EDMO icon CSC, IT Center for Science Ltd.
  • 8. Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici
  • 9. ROR icon Lund University
  • 10. Centro Euro-Mediterraneo sui Cambiamenti Climatici
  • 11. ROR icon Natural Resources Institute Finland
  • 12. NASA
  • 13. ROR icon University of Helsinki
  • 14. ROR icon Laboratoire des Sciences du Climat et de l'Environnement
  • 15. ROR icon Université de Versailles Saint-Quentin-en-Yvelines
  • 16. Lunds Universitet Naturvetenskapliga fakulteten
  • 17. Max Planck Institute for Biogeochemistry

Description

Wetland methane responses to temperature and precipitation are studied in a boreal wetland-rich region in northern Europe using ecosystem process models. Six ecosystem models (JSBACH-HIMMELI, LPX-Bern, LPJ-GUESS, JULES, CLM4.5, and CLM5) are compared to multi-model means of ecosystem models and atmospheric inversions from the Global Carbon Project and upscaled eddy covariance flux results for their temperature and precipitation responses and seasonal cycles of the regional fluxes. Two models with contrasting response patterns, LPX-Bern and JSBACH-HIMMELI, are used as priors in atmospheric inversions with Carbon Tracker Europe–CH4 (CTE-CH4) in order to find out how the assimilation of atmospheric concentration data changes the flux estimates and how this alters the interpretation of the flux responses to temperature and precipitation. Inversion moves wetland emissions of both models towards co-limitation by temperature and precipitation. Between 2000 and 2018, periods of high temperature and/or high precipitation often resulted in increased emissions. However, the dry summer of 2018 did not result in increased emissions despite the high temperatures. The process models show strong temperature and strong precipitation responses for the region (51 %–91 % of the variance explained by both). The month with the highest emissions varies from May to September among the models. However, multi-model means, inversions, and upscaled eddy covariance flux observations agree on the month of maximum emissions and are co-limited by temperature and precipitation. The setup of different emission components (peatland emissions, mineral land fluxes) has an important role in building up the response patterns. Considering the significant differences among the models, it is essential to pay more attention to the regional representation of wet and dry mineral soils and periodic flooding which contribute to the seasonality and magnitude of methane fluxes. The realistic representation of temperature dependence of the peat soil fluxes is also important. Furthermore, it is important to use process-based descriptions for both mineral and peat soil fluxes to simulate the flux responses to climate drivers.

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Additional details

Funding

European Commission
WET HORIZONS - WET HORIZONS - upgrading knowledge and solutions to fast-track wetland restoration across Europe 101056848

Dates

Accepted
2024-11-06

Software

Repository URL
https://doi.org/10.57707/FMI-B2SHARE.23392F65B1354D49ABD5146AA5589F9B

References

  • Aalto, T., Tsuruta, A., Mäkelä, J., Müller, J., Tenkanen, M., Burke, E., Chadburn, S., Gao, Y., Mannisenaho, V., Kleinen, T., Lee, H., Leppänen, A., Markkanen, T., Materia, S., Miller, P. A., Peano, D., Peltola, O., Poulter, B., Raivonen, M., Saunois, M., Wårlind, D., and Zaehle, S.: Air temperature and precipitation constraining the modelled wetland methane emissions in a boreal region in northern Europe, Biogeosciences, 22, 323–340, https://doi.org/10.5194/bg-22-323-2025, 2025.