where AP now includes the injection rate Q (if Q is nonzero) of species i and T represents the characteristic transport time. In Appendix B, it is shown that this approximation results from assuming that the transport characteristic time is not significantly affected by changes in the species concentrations. Equation 15 will be used as a diagnostic model to interpret the results of the more complete two-dimensional numerical model. The following features of Eq. 15 should be noted: Combining Eqs. 11 and 12, and dividing through by X gives
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