Seawater Carbonate System Calculator

Compute the full open-system carbonate speciation in seawater. Pick any two parameters from {TA, DIC, pH, pCO₂} plus salinity and temperature; the rest are calculated from equilibrium constants (Mehrbach 1973 refit by Dickson & Millero 1987, total pH scale; KSpCalcite/KSpAragonite from Mucci 1983). Validated against PyCO2SYS within 5 % across 7 reference cases.