Biogeosciences
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Articles | Volume 22, issue 18
Articles | Volume 22, issue 18
https://doi.org/10.5194/bg-22-4953-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4953-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 18
Research article
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25 Sep 2025
Research article | Highlight paper |  | 25 Sep 2025

Impacts of eutrophication and deoxygenation on the sediment biogeochemistry in the Sea of Marmara

İsmail Akçay, Süleyman Tuğrul, Hasan Örek, Devrim Tezcan, Koray Özhan, Barış Salihoğlu, and Mustafa Yücel

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This study provides evidence that the Sea of Marmara, a shallow shelf sea between the Mediterranean Sea and Black Sea, is on its way to becoming a "dead zone" similar to famous other examples in the Gulf of Mexico and Baltic Sea. Awareness of the large-scale formation of new oxygen-depleted zones in the ocean as a result of anthropogenic eutrophication and climate change-induced increased water columns stratification is of great importance.
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This study aims to understand the impacts of deoxygenation and eutrophication on sedimentary biogeochemical processes in the Sea of Marmara. We showed that diffusive phosphorus and fixed nitrogen fluxes were markedly high under highly eutrophic and hypoxic areas of the Sea of Marmara. This benthic feedback may exacerbate the ongoing eutrophication and deoxygenation in the Sea of Marmara, which is now at risk of becoming one of the major marine dead zones.
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