Behaviour of Tritium and Tritiogenic Helium in Freshwater Lens Groundwater Systems: Insights from Langeoog Island, Germany

Figure 2

Time series data used in the model: (a) total annual abstraction () from the freshwater lens (blue bars) as well as seasonally distributed abstraction per unit of surface area () versus time (red line); (b) calculated groundwater recharge (, bars) and ³H concentration of groundwater recharge (³H_rech, solid red line) and seawater (³H_sea, dashed red line) as a function of time (see text for source of data). The colour of the bars in (b) indicates relatively dry (yellow) or wet (green) phases based on the cumulative deviation from the mean recharge rate. The small green arrow pointing to the axis in (b) indicates the mean recharge rate () that was used in simulation A1.