EGU24-8907, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

CO2 emission from a subarctic mire with different permafrost status 

Patryk Łakomiec1,2, Jutta Holst2, and Janne Rinne3
Patryk Łakomiec et al.
  • 1FAAM Airborne Laboratory, National Centre for Atmospheric Science, Cranfield MK43 0AL, UK,
  • 2Department of Physical Geography and Ecosystem Science, Lund University, 223 62, Lund, Sweden
  • 3Natural Resources Institute Finland (Luke), 00790, Helsinki, Finland

The main goal of this work is to quantify the differences in net ecosystem exchange (NEE) of CO2, and its component processes, Gross Primary Production (GPP) and ecosystem respiration (Reco) across surfaces with different permafrost status at a sub-arctic mire complex. The study site, Abisko-Stordalen mire in Swedish Lapland, is situated in the mire (68°20' N, 19°30' E). We used data from the Integrated Carbon observation system (ICOS) Ecosystem station (SE-Sto). Palsa plateu and thawing sector data were used from the years 2014-2021, and for fen for 2014.  

We analyzed CO2 diel cycle for the summer months (June, July, August), to compare it for the three ecosystems. We found out that diel cycle is similar in terms of time but order of magnitude of CO2 fluxes is different for the fen than for the palsa and the thawing sector. CO2 responds for the air temperature and incoming radiation were compared among three ecosystems.    

We used three different gapfilling methods: REddyProc (Jena), artificial neural network (ANN), and generalized linear models (GLM) for the annual balance calculation. Gap-filling was made on a half-hour basis, and this allow us to divide fluxes to Reco and GPP.  Comparison of those two NEE components has been done for the palsa plateu and the thawing sector for the whole period.

Of the three surfaces that were examined in this study, the tall sedge fen had the highest CO2 uptake during the daytime in the summer and the highest net respiration at night as the growing season. However, there were no significant differences in CO2 fluxes between the palsa plateau and the thawing sector, despite their different permafrost conditions and vegetation characteristics. In contrast, there were significant differences in methane emissions between these systems. Multiple gap filling methods were found to be important for accurate CO2 emission estimation.

How to cite: Łakomiec, P., Holst, J., and Rinne, J.: CO2 emission from a subarctic mire with different permafrost status , EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-8907,, 2024.