[1] Geological Institute, Department of Earth Sciences, Swiss Federal Institute of Technology, Zürich, Switzerland
[2] Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
[3] Biological Sciences, University of Alberta, Edmonton, Canada
[4] John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge,MA, United States
[5] Woodwell Climate Research Center, Falmouth,MA, United States
[6] Northwest Territories Geological Survey, Yellowknife, Canada
[7] National Research Council, Institute of Polar Sciences, Bologna, Italy
[8] Department of Earth and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, United Kingdom
[9] Laboratory of Ion Beam Physics, Swiss Federal Institute of Technology, Zürich, Switzerland