Biogeosciences
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Articles | Volume 22, issue 6
Articles | Volume 22, issue 6
https://doi.org/10.5194/bg-22-1697-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-1697-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 6
Research article
 | 
01 Apr 2025
Research article |  | 01 Apr 2025

Surface CO2 gradients challenge conventional CO2 emission quantification in lentic water bodies under calm conditions

Patrick Aurich, Uwe Spank, and Matthias Koschorreck

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Short summary
Lakes can be sources and sinks of the greenhouse gas carbon dioxide. The gas exchange between the atmosphere and the water can be measured by taking gas samples from them. However, the depth of water samples is not well defined, which may cause errors. We hypothesized that gradients of CO2 concentrations develop under the surface when wind speeds are very low. Our measurements show that such a gradient can occur on calm nights, potentially shifting lakes from a CO2 sink to a source.
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