is confirmed by those 129 Iodine measurements. Fig. 3a (Graphic: Alfred-Wegener-Institut) Fig. 3b (Graphic: Alfred-Wegener-Institut) Fig. 3c (Graphic: Alfred-Wegener-Institut) Figure 1: Surface circulation of the Arctic Ocean (Graphic: Alfred-Wegener-Institut) Figure 2: Mid-depth circulation in the Arctic Ocean, which is fed from the Atlantic. 129 Iodine releases (inlet) [...] mark the Atlantic origin waters (Karcher et al, 2012) (Graphic: Alfred-Wegener-Institut) Fig. 3d (Graphic: Alfred-Wegener-Institut) Figure 3: Concentration of 129 Iodine [10 7 at/l] at 240m depth, tracing