Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock
Past glaciation is known to have caused a substantial morphological change to high latitude regions of the northern hemisphere. In the assessment of the long-term performance of deep geological repositories for radioactive wastes, future glaciation is a critical factor to take into consideration. Th...
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ftdoajarticles:oai:doaj.org/article:b2bf133eeb5548d1a739bc94ecb2a992 2024-01-07T09:43:23+01:00 Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock Zhenze Li Thanh Son Nguyen 2021-01-01T00:00:00Z https://doi.org/10.3390/min11020120 https://doaj.org/article/b2bf133eeb5548d1a739bc94ecb2a992 EN eng MDPI AG https://www.mdpi.com/2075-163X/11/2/120 https://doaj.org/toc/2075-163X doi:10.3390/min11020120 2075-163X https://doaj.org/article/b2bf133eeb5548d1a739bc94ecb2a992 Minerals, Vol 11, Iss 2, p 120 (2021) Greenland Analogue Project glaciation erosion rheology ice sheet TM coupling Mineralogy QE351-399.2 article 2021 ftdoajarticles https://doi.org/10.3390/min11020120 2023-12-10T01:43:09Z Past glaciation is known to have caused a substantial morphological change to high latitude regions of the northern hemisphere. In the assessment of the long-term performance of deep geological repositories for radioactive wastes, future glaciation is a critical factor to take into consideration. This study develops a thermal-mechanical model to investigate ice sheet thermal evolution and the impact on bedrock erosion. The model is based on comprehensive field data resulting from international collaborative research on the Greenland Analogue Project. The ice sheet model considers surface energy balance and basal heat flux, as well as the temperature-dependent flow of ice that follows Glen’s law. The ice-bedrock interface is treated with a mechanical contact model, which solves the relative velocity and predicts the abrasional erosion and meltwater flow erosion. The numerical model is calibrated with measured temperature profiles and surface velocities at different locations across the glacier cross-section. The erosion rate is substantially larger near the glacier edge, where channel flow erosion becomes predominant. The abrasional erosion rate is averaged at 0.006 mm/a, and peaks at regions near the ridge divide. The mean meltwater flow erosion rate in the study area is estimated to be about 0.12 mm/a for the melted base region. Article in Journal/Newspaper glacier Greenland Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Minerals 11 2 120 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Greenland Analogue Project glaciation erosion rheology ice sheet TM coupling Mineralogy QE351-399.2 |
spellingShingle |
Greenland Analogue Project glaciation erosion rheology ice sheet TM coupling Mineralogy QE351-399.2 Zhenze Li Thanh Son Nguyen Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
topic_facet |
Greenland Analogue Project glaciation erosion rheology ice sheet TM coupling Mineralogy QE351-399.2 |
description |
Past glaciation is known to have caused a substantial morphological change to high latitude regions of the northern hemisphere. In the assessment of the long-term performance of deep geological repositories for radioactive wastes, future glaciation is a critical factor to take into consideration. This study develops a thermal-mechanical model to investigate ice sheet thermal evolution and the impact on bedrock erosion. The model is based on comprehensive field data resulting from international collaborative research on the Greenland Analogue Project. The ice sheet model considers surface energy balance and basal heat flux, as well as the temperature-dependent flow of ice that follows Glen’s law. The ice-bedrock interface is treated with a mechanical contact model, which solves the relative velocity and predicts the abrasional erosion and meltwater flow erosion. The numerical model is calibrated with measured temperature profiles and surface velocities at different locations across the glacier cross-section. The erosion rate is substantially larger near the glacier edge, where channel flow erosion becomes predominant. The abrasional erosion rate is averaged at 0.006 mm/a, and peaks at regions near the ridge divide. The mean meltwater flow erosion rate in the study area is estimated to be about 0.12 mm/a for the melted base region. |
format |
Article in Journal/Newspaper |
author |
Zhenze Li Thanh Son Nguyen |
author_facet |
Zhenze Li Thanh Son Nguyen |
author_sort |
Zhenze Li |
title |
Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
title_short |
Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
title_full |
Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
title_fullStr |
Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
title_full_unstemmed |
Thermo-Mechanical Regime of the Greenland Ice Sheet and Erosion Potential of the Crystalline Bedrock |
title_sort |
thermo-mechanical regime of the greenland ice sheet and erosion potential of the crystalline bedrock |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/min11020120 https://doaj.org/article/b2bf133eeb5548d1a739bc94ecb2a992 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
Minerals, Vol 11, Iss 2, p 120 (2021) |
op_relation |
https://www.mdpi.com/2075-163X/11/2/120 https://doaj.org/toc/2075-163X doi:10.3390/min11020120 2075-163X https://doaj.org/article/b2bf133eeb5548d1a739bc94ecb2a992 |
op_doi |
https://doi.org/10.3390/min11020120 |
container_title |
Minerals |
container_volume |
11 |
container_issue |
2 |
container_start_page |
120 |
_version_ |
1787424647943290880 |