FIG. 6. Freezing characteristic data for the adjacent tundra. The curve used in the plot is the same as in Fig. 4, measured soil volumetric water content (v/v) versus temperature and fitted freezing characteristic curve, fitted to the nonsorted circle data. This figure expresses the difference in soil character for the nonsorted circle and adjacent tundra. The field data was obtained from the location of 1.0 x 1.0 m in our simulation grid.