CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Gosselin, C.; Mareschal, J.; Jaupart, C.; and Rolandone, F.
Date : 2002.
Title : 500 years ground surface temperature history in northwestern Ontario from borehole temperature profiles.
Publication : American Geophysical Union 2002 Fall Meeting, Moscone Center, San Francisco, California, 6-10 December 2002.
Issue :
Page(s) :
Abstract
A total of 49 temperature-depth profiles measured in drill holes have been obtained in the region northwest of Lake Superior and have been used for reconstruction of ground surface temperature history. The majority of these temperature profiles are 600m or deeper. Some of these profiles have been discarded because of known non climatic perturbations (lakes, topography, ground water circulation). The remaining temperature-depth profiles were inverted to infer the recent ($<$500 years) changes in ground surface temperature for northwestern Ontario. These were first inverted individually; then all the profiles from the same site were inverted jointly;and finally all the profiles with the same depth range were inverted simultaneously. The inversions suggest that a 1-2K warming of the ground surface started 200 years ago. This trend is similar to that inferred from similar studies in eastern Canada and in central Canada (northern Manitoba and Saskatchewan). However, there is no indication that a cold episode preceding the warming of the past 200 years, such as inferred both in eastern Canada and in Manitoba and Saskatchewan, also occured in northwestern Ontario.
Bibliography of Canadian Geomorphology