1. Norwegian Institute for Water Research, Oslo, Norway, and Lancaster Environment Centre, Lancaster, U.K.
2. ETH, Zürich, Switzerland
3. Norwegian Institute for Water Research, Oslo, Norway
4. Aarhus University, Roskilde, Denmark
5. Lancaster University, Lancaster, U.K.
6. Lund University, Sweden
7. University of Kassel, Witzenhausen, Germany
8. Centre for Ecology and Hydrology Lancaster Environment Centre, Lancaster, U.K.
9. Michigan Technological University, Houghton, Michigan
10. ETH Zürich, Switzerland
11. University of Göttingen, Germany
12. UFZ - Helmholtz Centre for Environmental Research, Leipzig, Germany
13. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, China