due to a poor understanding of changes in the soil thermal regime and liquid water content during the soil-freezing process.using an integrated approach combining in situ soil measurements, (PolSAR) and a remote-sensing-driven permafrost model. To better capture landscape variability in snow cover and its influence on the soil thermal reanalysis snow depth data using MODIS snow cover extent (SCE) observations.along the Alaska North Slope the observed and model-simulated zero-curtain periods were positively correlated (R > 0:55, p < 0:01) with a MODISderived snow cover fraction (SCF) from September to October