Читать книгу Isotopic Constraints on Earth System Processes - Группа авторов - Страница 63

Here we show that the model outputs and conclusions are not dependent on whether the activity is linearly or exponentially dependent on SiO₂ concentration. If the activity is an exponential function of SiO₂, then the equation for C_e

(2.A1)

becomes

(2.A2)

where the parameter B is functionally similar to the parameter C_f (Zhang, 1993). An exponential dependence was also adopted by Richter (1993). Fig. 2.9 compares the two approaches side by side and shows that the results and conclusions are not sensitive to this particular aspect of the Zhang model.