model CryoGrid 3 S. Westermann1, M. Langer2,3,4,5, J. Boike2, M. Heikenfeld2, M. Peter1,2, B. Etzelmüller1, and G. Krinner3,4 1Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 [...] runs with snow densities of 200 and 250 kgm−3. the snowmelt, since the dates obtained from the camera im- ages represent spatial averages, while the model calculates the snowmelt for only a single realization [...] 5 dx.doi.org/10.1007/978-3-540-74666-9 22 S. Westermann et al.: CryoGrid 3 Gisnås, K., Etzelmüller, B., Farbrot, H., Schuler, T., and Wester- mann, S.: CryoGRID 1.0: Permafrost distribution in Norway