1. Department of Ecology and Environmental Sciences Umeå University Umeå Sweden
2. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Potsdam Germany
3. Institute for Geosciences University of Potsdam Potsdam Germany
4. Centre for Microbiology and Environmental Systems Science University of Vienna Vienna Austria
5. Department of Physical Geography Stockholm University Stockholm Sweden
6. Bolin Centre for Climate Research Stockholm University Stockholm Sweden