Key points are not available for this paper at this time.
F. E. Nelson, N. I. Shiklomanov, G. R. Mueller, K. M. Hinkel, D. A. Walker, J. G. Bockheim, Estimating Active-Layer Thickness over a Large Region: Kuparuk River Basin, Alaska, U.S.A., Arctic and Alpine Research, Vol. 29, No. 4 (Nov., 1997), pp. 367-378
Nelson et al. (Sat,) studied this question.