ON THE ORIGIN OF AGGRADATIONAL ICE IN PERMAFROST.
The water balance in the upper layers of permafrost, near Mayo, Yukon Territory, has been monitored at two sites by neutron probe and heave displacement tubes. Results obtained between 4 April 1984 and 2 May 1985 are reported. The principal forces controlling water movement are temperature-induced: net water movement depends on the thermal regime and temperature-dependent variations in the hydraulic conductivity (k//f) of the frozen soil. Moisture incorporation into frozen ground from the thawing active layer continues throughout the period from snowmelt to late fall freeze-back. A result of this is that the permafrost layer just below the active layer is enriched annually with water derived from the atmosphere.
Burn, C, & Smith, M.W. (M. W.). (1985). ON THE ORIGIN OF AGGRADATIONAL ICE IN PERMAFROST. Freezing and Thawing of Soil-Water Syst, 77–84.