Global groundwater DIC and total alkalinity dataset from coastal aquifers used for submarine groundwater discharge (SGD) flux calculations

His dataset compiles groundwater geochemical measurements from 58 published studies of coastal aquifers worldwide. The dataset includes dissolved inorganic carbon (DIC), total alkalinity (TA), pH, major ions, salinity classification (fresh, brackish, saline), aquifer lithology (carbonate, sand, alluvium, basalt), and derived enrichment/depletion values relative to conservative mixing between freshwater and seawater endmembers. Where DIC was not reported in the original publication, it was calculated from TA and pH using PHREEQC (v3) at 25°C and 1 atm. The dataset was used to estimate global freshwater and saline submarine groundwater discharge (SGD) fluxes of DIC and alkalinity, as presented in the associated manuscript: “Alkalinity and carbon fluxes from coastal aquifers to the ocean via submarine groundwater discharge.” Units are specified in the spreadsheet headers.