1. Department of Environmental Systems Science Swiss Federal Institute of Technology, ETH Zurich Zürich Switzerland
2. Department of Earth and Environmental Sciences Rensselaer Polytechnic Institute Troy NY USA
3. Departments of Marine and Environmental Sciences, Chemistry and Chemical Biology, and Civil and Environmental Engineering Northeastern University Boston MA USA
4. Department of Soil Physics and Hydrology Congo Atomic Energy Commission Kinshasa XI Democratic Republic of Congo
5. Institute de Recherche en Sciences Exactes et Naturelles Ministère de la Recherche Scientifique Brazzaville Republic of Congo
6. Department of Earth, Ocean, and Atmospheric Science Florida State University Tallahassee FL USA