1. Centre for Biogeochemistry in the Anthropocene, Department of Chemistry, University of Oslo, P.O. Box 1033, 0315 Oslo, Norway
2. NILU-Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway
3. Aquatic Biology and Toxicology and Centre for Biogeochemistry in the Anthropocene, Department of Biosciences, University of Oslo, P.O. Box 1066, 0316 Oslo, Norway
4. Institute for Marine Sciences, University of Dar Es Salaam, Zanzibar, Tanzania
5. Department of Natural Sciences, Mbeya University of Science and Technology, Mbeya, Tanzania
6. Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265, Military Trail, ON MIC 1A4 Toronto, Canada
7. Norwegian Institute for Water Research, 0579 Oslo, Norway