Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 17
Articles | Volume 23, issue 17
https://doi.org/10.5194/bg-23-6037-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6037-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 17
Research article
 | 
03 Sep 2026
Research article |  | 03 Sep 2026

Ecosystem respiration during snowmelt and soil thaw leads to a rare annual CO2 net loss in a boreal fen

Karoliina Särkelä, Timo Vesala, Torben R. Christensen, Juval Cohen, Angelika Kübert, Xuefei Li, Hannu Marttila, Jouni Pulliainen, Eeva-Stiina Tuittila, and Efrén López-Blanco

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Latest update: 03 Nov 2026
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Short summary
Using a 17-year record of year-round peatland carbon exchange, we found that over half of the carbon sequestrated during summer was released during winter. In one year, CO₂ emissions during snow melt and soil thaw in spring were large enough to shift the peatland from a net carbon sink to a source. These findings demonstrate that winter and early-spring processes have a strong impact over the annual carbon balance of northern peatlands.
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