Figure 5: The predicted δ13C(DIC) values from the box model (described in the text) plotted as a function of time for selected latitudes.

The steady state value for different latitudes differs from each other due to changes in the production rate of organic matter and the time to attain that value is within 1000 to 5000 days from the initial stage when the δ13C(DIC) value is taken to be zero.