Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet
ABSTRACT. Sub- and proglacial bed conditions influence advance and retreat of an ice sheet. The existence and distribution of frozen ground is of major importance for better understanding of ice-flow dynamics and landform formation. The southern margin of the Laurentide ice sheet (LIS) was dominated...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.596.9099 2023-05-15T16:37:12+02:00 Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet Andreas Bauder David M. Mickelson Shawn J. Marshall The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.9099 http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.9099 http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf text ftciteseerx 2016-01-08T13:46:42Z ABSTRACT. Sub- and proglacial bed conditions influence advance and retreat of an ice sheet. The existence and distribution of frozen ground is of major importance for better understanding of ice-flow dynamics and landform formation. The southern margin of the Laurentide ice sheet (LIS) was dominated by the presence of relatively thin ice lobes that seem to have been very sensitive to external and internal physical conditions. Their extent and dynamics were highly influenced by the interaction of subglacial and proglacial conditions. A three-dimensional thermomechanical ice-sheet model was coupled with a model for the thermal regime in the upper Earth crust. The model has been applied to the LIS in order to investigate the spatial distribution of thermal conditions at the bed. The evolution of the whole LIS was modeled for the last glacial cycle, with primary attention on correct reconstruction of the southern margin. Our results show extensive temporal and spatial frozen ground conditions. Only a slow degradation of permafrost under the ice was found. We conclude that there are significant interactions between the ice sheet and the underlying frozen ground and that these influence both ice dynamics and landform development. 1. Text Ice Ice Sheet permafrost Unknown |
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English |
description |
ABSTRACT. Sub- and proglacial bed conditions influence advance and retreat of an ice sheet. The existence and distribution of frozen ground is of major importance for better understanding of ice-flow dynamics and landform formation. The southern margin of the Laurentide ice sheet (LIS) was dominated by the presence of relatively thin ice lobes that seem to have been very sensitive to external and internal physical conditions. Their extent and dynamics were highly influenced by the interaction of subglacial and proglacial conditions. A three-dimensional thermomechanical ice-sheet model was coupled with a model for the thermal regime in the upper Earth crust. The model has been applied to the LIS in order to investigate the spatial distribution of thermal conditions at the bed. The evolution of the whole LIS was modeled for the last glacial cycle, with primary attention on correct reconstruction of the southern margin. Our results show extensive temporal and spatial frozen ground conditions. Only a slow degradation of permafrost under the ice was found. We conclude that there are significant interactions between the ice sheet and the underlying frozen ground and that these influence both ice dynamics and landform development. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Andreas Bauder David M. Mickelson Shawn J. Marshall |
spellingShingle |
Andreas Bauder David M. Mickelson Shawn J. Marshall Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
author_facet |
Andreas Bauder David M. Mickelson Shawn J. Marshall |
author_sort |
Andreas Bauder |
title |
Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
title_short |
Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
title_full |
Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
title_fullStr |
Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
title_full_unstemmed |
Numerical modeling investigations of the subglacial conditions of the southern Laurentide ice sheet |
title_sort |
numerical modeling investigations of the subglacial conditions of the southern laurentide ice sheet |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.9099 http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.9099 http://www.geology.wisc.edu/~davem/abstracts/05-11.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766027496688451584 |