Quaternary relief generation by polythermal glacier ice
Abstract The juxtaposition of wet‐based erosive ice in valleys and cold‐based, non‐erosive ice atop felsenmeer‐covered interfluve plateaus has generated relief in the Torngat Mountains of northeastern Canada. Measurements of in situ terrestrial cosmogenic nuclide (TCN) concentrations from 31 bedrock...
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crwiley:10.1002/esp.1267 2024-04-28T08:20:19+00:00 Quaternary relief generation by polythermal glacier ice Staiger, Jane K. W. Gosse, John C. Johnson, Jesse V. Fastook, James Gray, James T. Stockli, Daniel F. Stockli, Lisa Finkel, Robert 2005 http://dx.doi.org/10.1002/esp.1267 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1267 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1267 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 30, issue 9, page 1145-1159 ISSN 0197-9337 1096-9837 Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development journal-article 2005 crwiley https://doi.org/10.1002/esp.1267 2024-04-08T06:56:18Z Abstract The juxtaposition of wet‐based erosive ice in valleys and cold‐based, non‐erosive ice atop felsenmeer‐covered interfluve plateaus has generated relief in the Torngat Mountains of northeastern Canada. Measurements of in situ terrestrial cosmogenic nuclide (TCN) concentrations from 31 bedrock sites, coupled with soils and geomorphology, indicate that erosion of the valleys has been >2 m during a single glacial–interglacial cycle. However, on summit plateaus the long‐term (over several glacial–interglacial cycles) erosion rate is <1·4 m Ma −1 . TCN ratios reveal that the exposure plus ice‐cover history retained on some summit surfaces probably spans more than 800 ka despite complete ice cover as recently as 11 ka. A thermodynamic ice sheet model with a basal water calculation is used to calculate the sliding distance normalized by the duration of ice cover for the region. We formulate a general glacial erosion rule for the Torngat Mountains, which correlates TCN‐derived erosion rates for terrain once partially covered by cold‐based ice with modelled average ice basal sliding velocities. Erosion rates vary linearly with average sliding velocity by a glacial erosion coefficient of 5 × 10 −7 . Due to the significant distribution of cold‐based ice cover in this high latitude region, our estimates of net regional glacial erosion and glacial erosion coefficient are orders of magnitude lower than a previously published value. Copyright © 2005 John Wiley & Sons, Ltd. Article in Journal/Newspaper glacier* Ice Sheet Wiley Online Library Earth Surface Processes and Landforms 30 9 1145 1159 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
topic |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
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Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development Staiger, Jane K. W. Gosse, John C. Johnson, Jesse V. Fastook, James Gray, James T. Stockli, Daniel F. Stockli, Lisa Finkel, Robert Quaternary relief generation by polythermal glacier ice |
topic_facet |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
description |
Abstract The juxtaposition of wet‐based erosive ice in valleys and cold‐based, non‐erosive ice atop felsenmeer‐covered interfluve plateaus has generated relief in the Torngat Mountains of northeastern Canada. Measurements of in situ terrestrial cosmogenic nuclide (TCN) concentrations from 31 bedrock sites, coupled with soils and geomorphology, indicate that erosion of the valleys has been >2 m during a single glacial–interglacial cycle. However, on summit plateaus the long‐term (over several glacial–interglacial cycles) erosion rate is <1·4 m Ma −1 . TCN ratios reveal that the exposure plus ice‐cover history retained on some summit surfaces probably spans more than 800 ka despite complete ice cover as recently as 11 ka. A thermodynamic ice sheet model with a basal water calculation is used to calculate the sliding distance normalized by the duration of ice cover for the region. We formulate a general glacial erosion rule for the Torngat Mountains, which correlates TCN‐derived erosion rates for terrain once partially covered by cold‐based ice with modelled average ice basal sliding velocities. Erosion rates vary linearly with average sliding velocity by a glacial erosion coefficient of 5 × 10 −7 . Due to the significant distribution of cold‐based ice cover in this high latitude region, our estimates of net regional glacial erosion and glacial erosion coefficient are orders of magnitude lower than a previously published value. Copyright © 2005 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Staiger, Jane K. W. Gosse, John C. Johnson, Jesse V. Fastook, James Gray, James T. Stockli, Daniel F. Stockli, Lisa Finkel, Robert |
author_facet |
Staiger, Jane K. W. Gosse, John C. Johnson, Jesse V. Fastook, James Gray, James T. Stockli, Daniel F. Stockli, Lisa Finkel, Robert |
author_sort |
Staiger, Jane K. W. |
title |
Quaternary relief generation by polythermal glacier ice |
title_short |
Quaternary relief generation by polythermal glacier ice |
title_full |
Quaternary relief generation by polythermal glacier ice |
title_fullStr |
Quaternary relief generation by polythermal glacier ice |
title_full_unstemmed |
Quaternary relief generation by polythermal glacier ice |
title_sort |
quaternary relief generation by polythermal glacier ice |
publisher |
Wiley |
publishDate |
2005 |
url |
http://dx.doi.org/10.1002/esp.1267 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1267 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1267 |
genre |
glacier* Ice Sheet |
genre_facet |
glacier* Ice Sheet |
op_source |
Earth Surface Processes and Landforms volume 30, issue 9, page 1145-1159 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.1267 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
30 |
container_issue |
9 |
container_start_page |
1145 |
op_container_end_page |
1159 |
_version_ |
1797583272280064000 |