Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 12, 115-127, 2016
https://doi.org/10.5194/cp-12-115-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 Jan 2016
Laurentide Ice Sheet basal temperatures during the last glacial cycle as inferred from borehole data
C. Pickler1, H. Beltrami2,3, and J.-C. Mareschal1 1GEOTOP, Centre de Recherche en Géochimie et en Géodynamique, Université du Québec à Montréal, Québec, Canada
2Climate & Atmospheric Sciences Institute and Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
3Centre ESCER pour l'étude et la simulation du climat à l'échelle régionale, Université du Québec à Montréal, Québec, Canada
Abstract. Thirteen temperature–depth profiles ( ≥  1500 m) measured in boreholes in eastern and central Canada were inverted to determine the ground surface temperature histories during and after the last glacial cycle. The sites are located in the southern part of the region that was covered by the Laurentide Ice Sheet. The inversions yield ground surface temperatures ranging from −1.4 to 3.0 °C throughout the last glacial cycle. These temperatures, near the pressure melting point of ice, allowed basal flow and fast flowing ice streams at the base of the Laurentide Ice Sheet. Despite such conditions, which have been inferred from geomorphological data, the ice sheet persisted throughout the last glacial cycle. Our results suggest some regional trends in basal temperatures with possible control by internal heat flow.

Citation: Pickler, C., Beltrami, H., and Mareschal, J.-C.: Laurentide Ice Sheet basal temperatures during the last glacial cycle as inferred from borehole data, Clim. Past, 12, 115-127, https://doi.org/10.5194/cp-12-115-2016, 2016.
Publications Copernicus
Download
Share