1. Department of Surface Waters Swiss Federal Institute of Aquatic Science and Technology (EAWAG) Seestrasse 79, CH‐6047 Kastanienbaum Switzerland.
2. Department of Water Resources and Drinking Water Swiss Federal Institute of Aquatic Science and Technology (EAWAG) CH‐8600 Dübendorf Switzerland
3. Department of Environmental Physics Swiss Federal Institute of Technology (ETH) CH‐8902 Zürich Switzerland
4. Leibniz‐Institute of Marine Sciences at Kiel University (IFM‐GEOMAR) Wischhofstraße 1‐3, D‐24148 Kiel Germany
5. Department of Applied Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology (EAWAG) Seestrasse 79, CH‐6047 Kastanienbaum Switzerland
6. Renard Centre of Marine Geology, Department of Geology and Soil Science Ghent University B‐9000 Ghent Belgium
7. Department of Isotope Geology Swiss Federal Institute of Technology (ETH) CH‐8902 Zürich Switzerland