Evolution of pH plume from a CO
flux = 103 t/yr (0.63 t/m2/yr) and 0.3% hydraulic gradient. CO2 source is at 170 m depth in an aquifer bounded by relatively impermeable clay layers. Plots show plume details between the CO2 leak source and sampling well at discrete time steps. The full lateral extent of the plume is shown in Movie 2 (see Additional file 2). The plots are also identified on the pH breakthrough curves in Figure 5.