Laurentide Ice Sheet basal temperatures during the last glacial cycle as inferred from borehole data

被引：20

作者：

Pickler, C. ^{[1
]}

Beltrami, H. ^{[2
,3
,4
]}

Mareschal, J. -C. ^{[1
]}

机构：

[1] Univ Quebec, Ctr Rech Geochim & Geodynam, GEOTOP, Montreal, PQ H3C 3P8, Canada

[2] St Francis Xavier Univ, Climate & Atmospher Sci Inst, Antigonish, NS B2G 1C0, Canada

[3] St Francis Xavier Univ, Dept Earth Sci, Antigonish, NS B2G 1C0, Canada

[4] Univ Quebec, Ctr ESCER Etud & Simulat Climat Echelle Reg, Montreal, PQ H3C 3P8, Canada

来源：

CLIMATE OF THE PAST | 2016年 / 12卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

GROUND SURFACE-TEMPERATURE; HEAT-FLOW DENSITY; SUPERIOR PROVINCE; CANADIAN SHIELD; GEOTHERMAL EVIDENCE; HOLOCENE CLIMATE; FLUX CHANGES; INVERSION; DEPTH; SENSITIVITY;

D O I：

10.5194/cp-12-115-2016

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 degrees 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.

引用

页码：115 / 127

页数：13

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