CryoGrid 3 is a land-surface scheme dedicated to modeling of ground temperatures in permafrost environments. Its excess ice module Xice is capable of simulating ground subsidence and thermokarst lake formation due to melting of excess ground ice. The basic version of CryoGrid 3 and Xice is described in the following article: Westermann, S., Langer, M., Boike, J., Heikenfeld, M., Peter, M., Etzelmüller, B., & Krinner, G. (2016). Simulating the thermal regime and thaw processes of ice-rich permafrost ground with the land-surface model CryoGrid 3. Geosci. Model Dev., 9(2), 523–546. https://doi.org/10.5194/gmd-9-523-2016 The model version of this release v1.0.0 has been extended by a hydrology scheme for unfrozen ground conditions, and schemes for the lateral transport of heat, water, and snow between adjacent parts of the simulated environment. It has been set-up to study the degradation of ice-wedge polygons as described in the following article which has been accepted for publication: Nitzbon, J., Langer, M., Westermann, S., Martin, L., Aas, K. S., & Boike, J. (2018). Pathways of ice-wedge degradation in polygonal tundra under different hydrological conditions. The Cryosphere Discussions, 1–61. https://doi.org/10.5194/tc-2018-211 The parameters are set to the default values that were used for the simulations in the article. Parameters different from the default values can be specified in the main script CryoGrid3_xice_mpi.m (general parameters) and in the function get_parallel_variables.m (tile-specific parameters) which is part of the module cryoGridLateral. To start the program, run the script CryoGrid3_xice_mpi.m. The default output directory is ./runs/.

{"references": ["Westermann, S., Langer, M., Boike, J., Heikenfeld, M., Peter, M., Etzelm\u00fcller, B., & Krinner, G. (2016). Simulating the thermal regime and thaw processes of ice-rich permafrost ground with the land-surface model CryoGrid 3. Geosci. Model Dev., 9(2), 523\u2013546. https://doi.org/10.5194/gmd-9-523-2016", "Nitzbon, J., Langer, M., Westermann, S., Martin, L., Aas, K. S., & Boike, J. (2018). Pathways of ice-wedge degradation in polygonal tundra under different hydrological conditions. The Cryosphere Discussions, 1\u201361. https://doi.org/10.5194/tc-2018-211"]}