Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 15
Articles | Volume 23, issue 15
https://doi.org/10.5194/bg-23-5533-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-5533-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 15
Research article
 | 
11 Aug 2026
Research article |  | 11 Aug 2026

Estuarine mixing drives organic nitrogen transformation and bioavailability dynamics

Chenglong Han, Shaojun Qiu, Xinyi Li, Ying Ke, Rolf D. Vogt, and Xueqiang Lu

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Short summary
Estuaries shape how nitrogen from rivers reaches the sea. We mixed river and seawater across a range of salinities and traced organic nitrogen using light signals and isotope patterns. Salt rapidly made much of the land-derived material stick to particles, boosting long-term burial in sediments. Meanwhile, microbes converted part of the remaining dissolved nitrogen into smaller compounds and ammonia that algae can use. These linked processes improve forecasts and management of coastal nitrogen.
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