Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 21
Articles | Volume 23, issue 21
https://doi.org/10.5194/bg-23-8289-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-8289-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 21
Research article
 | 
13 Nov 2026
Research article |  | 13 Nov 2026

Growing-season variability and environmental controls of CH4 and N2O fluxes across high-latitude terrestrial ecosystems

Johannes Niemi, Miska Luoto, Anna-Maria Virkkala, Johanna Lehtinen, and Jenni Hultman

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Short summary
We present 1273 greenhouse gas flux measurements from 144 locations across subarctic wetlands, tundra, and forests. Fluxes were strongly linked with soil temperature, moisture, and pH with pronounced seasonal variation. Key findings include significant N₂O sinks and CH₄ emissions from wetlands, increasing CH₄ emissions from degrading permafrost, and small but consistent CH₄ sinks in forest and tundra. These results help in reducing uncertainties in global greenhouse gas budgets and measurements.
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