Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 13
Articles | Volume 22, issue 13
https://doi.org/10.5194/bg-22-3375-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-3375-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 13
Research article
 | 
11 Jul 2025
Research article |  | 11 Jul 2025

Spring–neap tidal cycles modulate the strength of the carbon source at the estuary–coast interface

Vlad A. Macovei, Louise C. V. Rewrie, Rüdiger Röttgers, and Yoana G. Voynova

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Short summary
We found that biogeochemical variability at the land–sea interface (LSI) in two major temperate estuaries is modulated by the 14 d spring–neap tidal cycle, with large effects on dissolved inorganic and organic carbon concentrations and distribution. As this effect increases the strength of the carbon source to the atmosphere by up to 74 % during spring tide, it should be accounted for in regional models, which aim to resolve biogeochemical processing at the LSI. 
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