Benthic processes in tidal basins release isotopically light DIC to the southern North Sea
2 Geochemistry & Isotope Biogeochemistry, Marine Geology, Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock, Germany/ present address: Biota, Institut für ökologische Forschung und Planung, Bützow, Germany
3 Geochemistry & Isotope Biogeochemistry, Marine Geology, Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock, Germany/ present address: Hydroisotop, Schweitenkirchen, Germany
4 Institute of Carbon Cycles, Helmholtz Research Field: Earth and Environment, Geesthacht, Germany
5 Niedersächsische Landesbetrieb für Wasserwirtschaft, Küsten- und Naturschutz (NLWKN), Germany
6 Geochemistry & Isotope Biogeochemistry, Marine Geology, Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock, Germany/ Marine Geochemistry, University of Greifswald, Germany/ Interdisciplinary Faculty, University of Rostock, Germany
O 3.5 in Earth System Science and Reconstruction
28.09.2023, 10:30-10:45, H 36
The Wadden Sea is a highly dynamic system that acts as an important driver for the North Sea carbonate system. Here, we focus on understanding the pelagic and benthic processes that control the production and release of DIC into the Wadden Sea surface waters. Surface and pore water samples were collected for major and trace elements, nutrients, and the stable isotope (H, C, O) composition measurements. Sediment samples were taken for organic and inorganic carbon contents, as well as C isotopes analyses. Among the different processes impacting the DIC of the Wadden Sea surface waters, the contribution from anoxic porewater is one of the most prominent. Downcore variations of pore water variables in sediments demonstrate the role of different mineralization processes in the release of DIC and the resulting of isotopic light fluxes of DIC across the sediment-water interface. Further work is needed to understand and quantify the net production of DIC and the resulting fluxes in and out of Wadden Sea sediments and further evaluate their role for the North Sea carbon system at different temporal and spatial scales.
The investigations belong to the BMBF project COOLSTYLE/CARBOSTORE, parts to BIOACID, and are further supported by Leibniz IOW.
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