The Geophysical Institute Permafrost Lab (GIPL) model was developed specifically to assess the effect of a changing climate on permafrost. The GIPL 1.0 model is a quasi-transitional, spatially distributed, equilibrium model for calculating the active layer thickness and mean annual ground temperature. Input parameters to the model are spatial datasets of mean monthly air temperature and precipitation, prescribed vegetation, soil thermal properties, and water content, which are specific for each vegetation and soil class and geographical location. The Scenarios Network for Alaska Planning (SNAP) data set was used for climate forcing.