An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model
By combining in situ measurements and a two-dimensional thermomechanically coupled ice flow model, we investigate the thermomechanical features of the largest valley glacier (Laohugou Glacier No. 12; LHG12) on Qilian Shan located in the arid region of western China. Our model results suggest that LH...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007066 2023-05-15T18:32:32+02:00 An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model Wang, Yuzhe Zhang, Tong Ren, Jiawen Qin, Xiang Liu, Yushuo Sun, Weijun Chen, Jizu Ding, Minghu Du, Wentao Qin, Dahe 2018-03 electronic https://doi.org/10.5194/tc-12-851-2018 https://noa.gwlb.de/receive/cop_mods_00007066 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007023/tc-12-851-2018.pdf https://tc.copernicus.org/articles/12/851/2018/tc-12-851-2018.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-12-851-2018 https://noa.gwlb.de/receive/cop_mods_00007066 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007023/tc-12-851-2018.pdf https://tc.copernicus.org/articles/12/851/2018/tc-12-851-2018.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-851-2018 2022-02-08T22:58:44Z By combining in situ measurements and a two-dimensional thermomechanically coupled ice flow model, we investigate the thermomechanical features of the largest valley glacier (Laohugou Glacier No. 12; LHG12) on Qilian Shan located in the arid region of western China. Our model results suggest that LHG12, previously considered as fully cold, is probably polythermal, with a lower temperate ice layer overlain by an upper layer of cold ice over a large region of the ablation area. Modelled ice surface velocities match well with the in situ observations in the east branch (main branch) but clearly underestimate those near the glacier terminus, possibly because the convergent flow is ignored and the basal sliding beneath the confluence area is underestimated. The modelled ice temperatures are in very good agreement with the in situ measurements from a deep borehole (110 m deep) in the upper ablation area. The model results are sensitive to surface thermal boundary conditions, for example surface air temperature and near-surface ice temperature. In this study, we use a Dirichlet surface thermal condition constrained by 20 m borehole temperatures and annual surface air temperatures. Like many other alpine glaciers, strain heating is important in controlling the englacial thermal structure of LHG12. Our transient simulations indicate that the accumulation zone becomes colder during the last two decades as a response to the elevated equilibrium line altitude and the rising summer air temperatures. We suggest that the extent of accumulation basin (the amount of refreezing latent heat from meltwater) of LHG12 has a considerable impact on the englacial thermal status. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 12 3 851 866 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Wang, Yuzhe Zhang, Tong Ren, Jiawen Qin, Xiang Liu, Yushuo Sun, Weijun Chen, Jizu Ding, Minghu Du, Wentao Qin, Dahe An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
topic_facet |
article Verlagsveröffentlichung |
description |
By combining in situ measurements and a two-dimensional thermomechanically coupled ice flow model, we investigate the thermomechanical features of the largest valley glacier (Laohugou Glacier No. 12; LHG12) on Qilian Shan located in the arid region of western China. Our model results suggest that LHG12, previously considered as fully cold, is probably polythermal, with a lower temperate ice layer overlain by an upper layer of cold ice over a large region of the ablation area. Modelled ice surface velocities match well with the in situ observations in the east branch (main branch) but clearly underestimate those near the glacier terminus, possibly because the convergent flow is ignored and the basal sliding beneath the confluence area is underestimated. The modelled ice temperatures are in very good agreement with the in situ measurements from a deep borehole (110 m deep) in the upper ablation area. The model results are sensitive to surface thermal boundary conditions, for example surface air temperature and near-surface ice temperature. In this study, we use a Dirichlet surface thermal condition constrained by 20 m borehole temperatures and annual surface air temperatures. Like many other alpine glaciers, strain heating is important in controlling the englacial thermal structure of LHG12. Our transient simulations indicate that the accumulation zone becomes colder during the last two decades as a response to the elevated equilibrium line altitude and the rising summer air temperatures. We suggest that the extent of accumulation basin (the amount of refreezing latent heat from meltwater) of LHG12 has a considerable impact on the englacial thermal status. |
format |
Article in Journal/Newspaper |
author |
Wang, Yuzhe Zhang, Tong Ren, Jiawen Qin, Xiang Liu, Yushuo Sun, Weijun Chen, Jizu Ding, Minghu Du, Wentao Qin, Dahe |
author_facet |
Wang, Yuzhe Zhang, Tong Ren, Jiawen Qin, Xiang Liu, Yushuo Sun, Weijun Chen, Jizu Ding, Minghu Du, Wentao Qin, Dahe |
author_sort |
Wang, Yuzhe |
title |
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
title_short |
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
title_full |
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
title_fullStr |
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
title_full_unstemmed |
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model |
title_sort |
investigation of the thermomechanical features of laohugou glacier no. 12 on qilian shan, western china, using a two-dimensional first-order flow-band ice flow model |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-851-2018 https://noa.gwlb.de/receive/cop_mods_00007066 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007023/tc-12-851-2018.pdf https://tc.copernicus.org/articles/12/851/2018/tc-12-851-2018.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-12-851-2018 https://noa.gwlb.de/receive/cop_mods_00007066 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007023/tc-12-851-2018.pdf https://tc.copernicus.org/articles/12/851/2018/tc-12-851-2018.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-12-851-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
3 |
container_start_page |
851 |
op_container_end_page |
866 |
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1766216657746788352 |