Tidally-driven CO2 and 222Rn data from a Danish coastal lagoon

This dataset comprises raw data obtained from measurements conducted within a temperate coastal lagoon, Nissum Fjord, located at the west coast of Denmark. The dataset originates from continuous timeseries observations over four days in March 2025. It includes measurements of carbon dioxide partial pressure within the water column and the additional parameters water depth, temperature, salinity, dissolved oxygen, pH, wind speed, and radon decay. The timestamps correspond to the Central European Time zone (CET). This dataset was used to resolve tidal and gate opening dynamics of carbon dioxide water-air fluxes and related submarine groundwater discharge dynamics. Dataset is found in csv.file "Data". Units, parameter and instrument description are found in csv.file "Metadata".