Seasonal redox variability allows vivianite to become a key form of phosphorus in marine sediments

This dataset comprises new geochemical data combined with previously published data from water column, porewater, and sediment samples collected in Scharendijke basin (the Netherlands) during sampling campaigns in March, June, August, and September 2021. The dataset also includes previously published porewater and sediment data from site NB8 in the Bothnian Sea, together with new data calculated from these published data.