1. Department of Geography, RWTH Aachen University, Germany
2. Geological Institute, RWTH Aachen University, Germany
3. Arctic Centre, University of Lapland, Rovaniemi, Finland
4. Department of Physics, University of Helsinki, Finland
5. Department of Ecology, TU Berlin, Germany
6. Geophysical Institute, University of Alaska, Fairbanks, USA
7. Centre for Remote Sensing on Land Applications (ZFL), University of Bonn, Germany
8. Department of Geomorphology, University of Silesia, Sosnowiec, Poland
9. Department of Earth Sciences, Uppsala University, Sweden
10. Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland