1. Department of Environmental System Science, Institute for Atmospheric and Climate ScienceETH Zurich Zurich Switzerland
2. Department of Civil, Environmental and Geomatic Engineering, Institute for Building MaterialsETH Zurich Zurich Switzerland
3. Department of Functional Materials, Cellulose & Wood MaterialsEMPA Dubendorf Switzerland
4. Now at Department of Geoscience, Section for Meteorology and OceanographyUniversity of Oslo Oslo Norway