Key points are not available for this paper at this time.
T. E. Osterkamp, V. E. Romanovsky, Characteristics of Changing Permafrost Temperatures in the Alaskan Arctic, U.S.A., Arctic and Alpine Research, Vol. 28, No. 3, Arctic Soils and Permafrost: Special Issue in Memory of Kaye R. Everett (Aug., 1996), pp. 267-273
Osterkamp et al. (Thu,) studied this question.