Sediment Dissolved Organic Carbon Release in the Baltic Sea

Dissolved organic carbon (DOC) flux evaluated by Fick's first law of diffusion. The values were evaluated using the pore water dissolved organic matter, average weighted apparent molecular weight of DOM measured in samples collected by Rhizon samplers from the water 2 cm above the sediment and the top 10 cm of the sediment cores at 2 cm intervals. The porosity was evaluated as sediment water content was obtained from sediment samples collected via slicing of the upper 10 cm of sediment cores over 2 cm intervals. The sediment cores were recovered using GeMax sediment corer. These samples were collected between 2020 and 2021 during cruises onboard RV Oceania (Institute of Oceanology of the Polish Academy of Sciences), which took place in spring, autumn, and winter, to the Central and Southern Baltic Sea, i.e., Eastern Gotland Basin, Bornholm Basin, and Gdansk Basin. The reported DOC sediment fluxes are the final product.