Sediment-water fluxes of methane, dissolved inorganic carbon, ammonium and oxygen; sediment porosity and organic carbon content in Curonian, Vistula and Oder lagoons

The data file shows novel, previously unpublished data on: - sediment-water fluxes of methane (CH4) - sediment-water fluxes of dissolved inorganic carbon (DIC) - sediment-water fluxes of ammonium (NH4+) - sediment-water fluxes of oxygen (O2) - sedimentary porosity - sedimentary organic carbon content (Corg) collected from three European lagoons (Curonian, Vistula and Oder) between 2021 and 2023.