Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 17
Articles | Volume 23, issue 17
https://doi.org/10.5194/bg-23-6317-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6317-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 17
Research article
 | 
14 Sep 2026
Research article |  | 14 Sep 2026

A boost on the final stretch: intense river metabolism and wetland discharge increase aquatic CO2 dynamics in the Danube Delta

Marie-Sophie Maier, Bernhard Wehrli, and Cristian R. Teodoru

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Short summary
Monitoring stations in the Danube Delta revealed two orders of magnitude difference in the intensity of oxygen and carbon dioxide cycles. Biological processes were driving more intense day-night cycles in delta channels compared to river reaches and were mainly controlled by changes in temperature and cloud cover. Wetland discharge added dissolved CO2 from anaerobic processes and caused higher emission rates in delta channels and downstream river reaches. 
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