1. Department of Watershed Science, Utah State University, Logan, Utah 84332, United States
2. National Center for Earth-surface Dynamics, University of Minnesota, Minneapolis, Minnesota 55414, United States
3. Department of Geological Sciences, University of Minnesota-Duluth, Duluth, Minnesota 55812, United States
4. St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota 55047, United States
5. Department of Geography and Environmental Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
6. Geology and Geophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455, United States
7. Minnesota Geological Survey, St. Paul, Minnesota 55114, United States
8. Department of Civil and Environmental Engineering, Seattle University, Seattle, Washington 98122, United States
9. Department of Civil & Environmental Engineering and Department of Geology, University of Illinois, Urbana, Illinois 61801, United States
10. Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
11. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 3.4, Earth Surface Geochemistry, D-14473 Potsdam, Germany