Dissolved inorganic carbon is the total dissolved carbon in inorganic species, principally aqueous carbon dioxide, bicarbonate and carbonate. A reservoir model may express its concentration in moles of carbon per kilogram of water. Air–sea exchange, river inputs, carbonate chemistry and burial affect its inventory; a single linear concentration-pressure relation is a model simplification.
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Dissolved inorganic carbon (DIC) refers to the total concentration of inorganic carbon species present in water. It primarily includes carbon dioxide (CO2), carbonic acid (H2CO3), bicarbonate (HCO3-), and carbonate (CO3^2-). DIC is a crucial component of the carbon cycle and plays a significant role in regulating the acidity (pH) of natural waters, including oceans and freshwater systems.