Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 20
Articles | Volume 22, issue 20
https://doi.org/10.5194/bg-22-6173-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-6173-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 20
Research article
 | 
29 Oct 2025
Research article |  | 29 Oct 2025

Subsurface CO2 dynamics in a temperate karst system reveal complex seasonal and spatial variations

Sarah Ann Rowan, Marc Luetscher, Thomas Laemmel, Anna Harrison, Sönke Szidat, and Franziska A. Lechleitner

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Short summary
We explored CO2 from the soil to subsurface at Milandre cave, finding very high concentrations at all depths. While forest soils produced modern CO2 year-round, cave and meadow soil CO2 influences vary with temperature-controlled cave ventilation, with older CO2 input in winter from old organic matter stored underground. These findings show that CO2 fluxes in karst systems are highly dynamic, and a better understanding of them is important for accurate carbon cycle modelling.
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