Biogeosciences
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Articles | Volume 22, issue 21
Articles | Volume 22, issue 21
https://doi.org/10.5194/bg-22-6749-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-6749-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 21
Research article
 | 
13 Nov 2025
Research article |  | 13 Nov 2025

Deltaic burial of authigenic calcite modulates the carbon balance of hardwater lakes

Benedict V. A. Mittelbach, Margot E. White, Timo M. Y. Rhyner, Negar Haghipour, Marie-Elodie Perga, Nathalie Dubois, and Timothy I. Eglinton

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Short summary
Lakes can emit carbon dioxide but also store carbon in their sediments. In hardwater lakes like Lake Geneva, calcite precipitates in the water column, releasing CO2 to the atmosphere, but upon sinking these particles also transport carbon to the sediment. Using sediment traps and radiocarbon isotopes, we show that much of the precipitated calcite is buried, highlighting an overlooked carbon sink that partly offsets the CO2 outgassing and should be included in lake carbon budgets.
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