Dimitrios Koulialias, ETH Zürich, Department of Earth Sciences, Zürich, Switzerland, Barbara Lesniak, ETH Swiss Federal Institute of Technology Zurich, Department of Earth Sciences, Zurich, Switzerland, Susan Glasauer, University of Guelph, School of Environmental Sciences, Guelph, ON, Canada and Andreas Ulrich Gehring, ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland