Figure 5.
The predicted isotopic equilibrium (θ) determined with various isotopic compositions of water at the site of CO2-H2O oxygen exchange (δex). Calculations were made with gw values ranging from 10 to 5 mol m−2 s−1 Pa−1. θ was calculated using Equation 7 where Δea was determined using Equation 5 and substituting δe with various values of δex. Δca was calculated from parameters taken from the high light wild-type F. bidentis measurements in Table II. δex values are presented relative to VSMOW.