Fig. 6: Time series of δ2H / δ18O values in water samples collected between 18th March 2020 and 3rd March 2021 at the ferry harbour Kloster, Hiddensee (Vitter Bodden; sampling point I), in comparison to salinity and water temperature. Error bars indicate standard deviation of replicate measurements. Water level from Strela Sound (Stralsund; point #40) provided by WSV (WSV, 2022). Monthly surface flow data from NRBC to Vitter bodden (STALU, 2022).