Click on image to view larger version.
FIG. 9. (A) Chlorofluorocarbon and SF6 concentrations at the Central High Plains Conservation Reserve site CAL-121 measured in August 2001 compared with simulated profiles for porosity, moisture content, and tortuosity data shown in Table 2; and (B) comparison of simulated to measured N2O concentrations for production of 0.017 kg N2O-N ha–1 yr–1 at the 15- to 17-m zone and 0.004 kg N2O-N ha–1 yr–1 at the water table, beginning in 1990 with an initial concentration of 4000 nm3 m–3. X in line represents mean and range of groundwater (GW) equivalent equilibrium concentration in water-vapor-saturated air.
