Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data
We use temperature profiles from 4 deep (>1600 m) boreholes across Canada to determine ground surface temperature histories (GSTH's) through and after the Last Glacial Maximum (LGM). Inversion yields the temperature history at the base of the glacier and the surface temperature evolution aft...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2003
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834/document https://hal.archives-ouvertes.fr/hal-00067834/file/2003GL018046.pdf https://doi.org/10.1029/2003GL018046 |
id |
ftunivnantes:oai:HAL:hal-00067834v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-00067834v1 2023-05-15T16:22:21+02:00 Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data Rolandone, Frédérique Mareschal, J.C. Jaupart, C. Laboratoire de tectonique (LT) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Cergy Pontoise (UCP) Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS) 2003 https://hal.archives-ouvertes.fr/hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834/document https://hal.archives-ouvertes.fr/hal-00067834/file/2003GL018046.pdf https://doi.org/10.1029/2003GL018046 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL018046 hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834/document https://hal.archives-ouvertes.fr/hal-00067834/file/2003GL018046.pdf doi:10.1029/2003GL018046 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-00067834 Geophysical Research Letters, American Geophysical Union, 2003, 30 (18), pp.1944. ⟨10.1029/2003GL018046⟩ [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2003 ftunivnantes https://doi.org/10.1029/2003GL018046 2022-10-11T23:25:46Z We use temperature profiles from 4 deep (>1600 m) boreholes across Canada to determine ground surface temperature histories (GSTH's) through and after the Last Glacial Maximum (LGM). Inversion yields the temperature history at the base of the glacier and the surface temperature evolution after the glacial retreat. The results indicate geographic differences in basal temperature history across the Ice Sheet. During the Last Glacial Maximum, temperatures at the base of the Ice Sheet were lower in eastern Canada, at the southeastern edge of the glacier, than in central Canada, southwest of the glacier center. At all sites, basal temperatures were above the melting point of ice during and after the LGM, which may explain the highly unstable character of the Ice Sheet. The GSTH's are consistent with information on the history of the Laurentide ice sheet and provide quantitative constraints on glacier flow dynamics. Article in Journal/Newspaper glacier* Ice Sheet Université de Nantes: HAL-UNIV-NANTES Canada Geophysical Research Letters 30 18 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Rolandone, Frédérique Mareschal, J.C. Jaupart, C. Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
We use temperature profiles from 4 deep (>1600 m) boreholes across Canada to determine ground surface temperature histories (GSTH's) through and after the Last Glacial Maximum (LGM). Inversion yields the temperature history at the base of the glacier and the surface temperature evolution after the glacial retreat. The results indicate geographic differences in basal temperature history across the Ice Sheet. During the Last Glacial Maximum, temperatures at the base of the Ice Sheet were lower in eastern Canada, at the southeastern edge of the glacier, than in central Canada, southwest of the glacier center. At all sites, basal temperatures were above the melting point of ice during and after the LGM, which may explain the highly unstable character of the Ice Sheet. The GSTH's are consistent with information on the history of the Laurentide ice sheet and provide quantitative constraints on glacier flow dynamics. |
author2 |
Laboratoire de tectonique (LT) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Cergy Pontoise (UCP) Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Rolandone, Frédérique Mareschal, J.C. Jaupart, C. |
author_facet |
Rolandone, Frédérique Mareschal, J.C. Jaupart, C. |
author_sort |
Rolandone, Frédérique |
title |
Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
title_short |
Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
title_full |
Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
title_fullStr |
Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
title_full_unstemmed |
Temperatures at the base of the Laurentide Ice Sheet inferred from borehole temperature data |
title_sort |
temperatures at the base of the laurentide ice sheet inferred from borehole temperature data |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.archives-ouvertes.fr/hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834/document https://hal.archives-ouvertes.fr/hal-00067834/file/2003GL018046.pdf https://doi.org/10.1029/2003GL018046 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
glacier* Ice Sheet |
genre_facet |
glacier* Ice Sheet |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-00067834 Geophysical Research Letters, American Geophysical Union, 2003, 30 (18), pp.1944. ⟨10.1029/2003GL018046⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003GL018046 hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834 https://hal.archives-ouvertes.fr/hal-00067834/document https://hal.archives-ouvertes.fr/hal-00067834/file/2003GL018046.pdf doi:10.1029/2003GL018046 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2003GL018046 |
container_title |
Geophysical Research Letters |
container_volume |
30 |
container_issue |
18 |
_version_ |
1766010314176856064 |