XY Plot of Total Carbonic Acid vs. Alkalinity

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• XY plot of total carbonic acid vs. alkalinity

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  • Total carbonation and alkalinity changes

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• Distribution of total carbonic acid (DIC) and alkalinity (Alk)
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    XY plots of DIC and Alk 웹페이지

    　In this section, we consider the distribution of DIC and alkalinity and how they are determined in all oceans.

    　Solving a total of six equations for the carbonic acid components (three equations), the equilibrium conditions of water, and the defining equations for DIC and Alk, we can find the other two if two of the four items, DIC, Alk, pCO₂, and pH, are given. If we try to solve the equation by including boric acid ions, we will end up with a numerical solution of a fifth-order equation, so we simplified the equation to Alk = 【HCO₃^-】 + 2【CO₃^2-】, and the relationship between DIC, Alk, and pCO₂ is shown in the figure below under a water temperature of 20°C and a constant salinity of 34.

    
    

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    XY plots of DIC and Alk (oceanographic data) 웹페이지

    　Actual ocean data is included in the XY plot showing the relationship between DIC, Alk, and pCO₂. DIC and Alk in the North Atlantic High Latitudes are marked with blue circles. You can see how Alk and DIC increase as this water sinks into the deeper layers and flows into the deep South Atlantic, deep Antarctic, and deep North Pacific. Noteworthy, from the North Atlantic to the Deep South Atlantic, the increase in Alk is small. Why is this?
    

    
    

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    Go to the "Ocean Chemistry" contents URL
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    Go to the previous course (Vertical Cross Section of Alkalinity and Total Carbonic Acid in the Pacific Ocean) URL
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    Go to the next course (Oxygen of the Earth) URL