Total alkalinity and PH

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    Total alkalinity

    Concentration of ions that can be converted to uncharged species by a strong acid. The model assumes AT =[HCO3-] + [CO32-], often referred to as carbonate alkalinity. Alkalinity and DIC together quantify the equilibrium state of the seawater carbon chemistry.

    PH

    pH based on [H+] calculated from carbon chemistry equlibra at water column values of T, S, DIC and AT.