Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 10
Articles | Volume 23, issue 10
https://doi.org/10.5194/bg-23-3323-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3323-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 10
Research article
 | 
18 May 2026
Research article |  | 18 May 2026

Marine carbonate system variability from tidal to seasonal timescales at the interface between the North Sea and Wadden Sea

Yasmina Ourradi, Gert-Jan Reichart, Sonja van Leeuwen, and Matthew P. Humphreys

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Short summary
Coastal seas play a key role in the global carbon cycle, yet what drives their carbonate chemistry remains poorly understood. We measured pH at high frequency for a year at the Wadden Sea-North Sea interface. Biological activity drives pH changes, while freshwater inflow shapes total alkalinity. Both processes influence dissolved inorganic carbon. The Wadden Sea acts as a net carbon dioxide source to the atmosphere. High-frequency monitoring is essential under a changing climate.
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