FIGURE 1.

(a) Schematic representation of the experimental site in Argentona showing the location of the piezometers (black bars) and the screened intervals (grey) of each piezometer (grey areas). Piezometer samples are referred to in the text as “groundwater” samples (n = 10) and are distinguished from the beach porewater and the seawater samples. N1 and N2 refer to two nests which consist of three piezometers screened at different depths. The red dots indicate the location of the four sites from which groundwater for the experimental incubations was collected. (b) Spatial variability in the measured physicochemical parameters. The vertical grey lines indicate the position of the piezometers, and the horizontal dotted line indicates the soil surface. The symbols indicate whether the samples belong to the aquifer (Groundwater), to beach porewater obtained next to the shoreline (Porewater) or to surface seawater (Sea). Cond, conductivity; DO, dissolved oxygen; Temp, temperature