CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Allen, D.M.
Date : 1988
Title : The permafrost regime in the Mackenzie Delta-Beaufort Sea Region, NWT and its paleoclimatic implications
Publication : Unpublished M.Sc. thesis. Carleton University, Ottawa
Issue :
Page(s) :
Abstract
Observed depths to the base of the ice-bearing permafrost in the Mackenzie Delta Region, N.W.T. range from over 700m to less than 100m. The wide variation in the thickness and distribution of permafrost is due in part to differences in the subsurface deltaic lithologies and to the complexity of the past surface temperature history, exhibited, for example, by fluctuations of the mean annual ground temperature, Paleoclimatic reconstructions for the Mackenzie Delta using numerical models of permafrost aggradation indicate that permafrost has aggraded since the end of the Sangamonian (75,000 years B.P.) when surface temperatures were approximately -1 C. An Early and Late Wisconsinan surface temperature of -18 C and a Mid-Wisconsinan rise to -8 C, similar to mean surface temperature today, are sufficient to account for the observed maximum permafrost thicknesses in the region.
Bibliography of Canadian Geomorphology