Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan
To quantify the ablation processes on a debris covered glacier, a simple distributed ablation model has been developed and applied to a selected glacier. For this purpose, a set of field measurements was carried out to collect empirical data. A morphometric analysis of the glacier surface enables us...
Published in: | The Cryosphere |
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2014
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Online Access: | https://doi.org/10.5194/tc-8-377-2014 http://www.the-cryosphere.net/8/377/2014/tc-8-377-2014.pdf https://doaj.org/article/bd9a24cf72d4495cb484fb08c55939de |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:bd9a24cf72d4495cb484fb08c55939de 2023-05-15T18:32:22+02:00 Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan M. Juen C. Mayer A. Lambrecht H. Han S. Liu 2014-03-01 https://doi.org/10.5194/tc-8-377-2014 http://www.the-cryosphere.net/8/377/2014/tc-8-377-2014.pdf https://doaj.org/article/bd9a24cf72d4495cb484fb08c55939de en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-8-377-2014 http://www.the-cryosphere.net/8/377/2014/tc-8-377-2014.pdf https://doaj.org/article/bd9a24cf72d4495cb484fb08c55939de undefined The Cryosphere, Vol 8, Iss 2, Pp 377-386 (2014) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.5194/tc-8-377-2014 2023-01-22T19:27:39Z To quantify the ablation processes on a debris covered glacier, a simple distributed ablation model has been developed and applied to a selected glacier. For this purpose, a set of field measurements was carried out to collect empirical data. A morphometric analysis of the glacier surface enables us to capture statistically the areal distribution of topographic features that influence debris thickness and consequently ablation. Remote-sensing techniques, using high-resolution satellite imagery, were used to extrapolate the in situ point measurements to the whole ablation area and to map and classify melt-relevant surface types. As a result, a practically applicable method is presented that allows the estimation of ablation on a debris covered glacier by combining field data and remote-sensing information. The sub-debris ice ablation accounts for about 24% of the entire ice ablation, while the percentage of the moraine covered area accounts for approximately 32% of the entire glacierized area. Although the ice cliffs occupy only 1.7% of the debris covered area, the melt amount accounts for approximately 12% of the total sub-debris ablation and 2.5% of the total ablation respectively. Our study highlights the influence of debris cover on the response of the glacier terminus in a particular climate setting. Due to the fact that melt rates beyond 0.1 m of moraine cover are highly restricted, the shielding effect of the debris cover dominates over the temperature and elevation dependence of the ablation in the bare ice case. Article in Journal/Newspaper The Cryosphere Unknown The Cryosphere 8 2 377 386 |
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English |
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geo envir M. Juen C. Mayer A. Lambrecht H. Han S. Liu Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
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geo envir |
description |
To quantify the ablation processes on a debris covered glacier, a simple distributed ablation model has been developed and applied to a selected glacier. For this purpose, a set of field measurements was carried out to collect empirical data. A morphometric analysis of the glacier surface enables us to capture statistically the areal distribution of topographic features that influence debris thickness and consequently ablation. Remote-sensing techniques, using high-resolution satellite imagery, were used to extrapolate the in situ point measurements to the whole ablation area and to map and classify melt-relevant surface types. As a result, a practically applicable method is presented that allows the estimation of ablation on a debris covered glacier by combining field data and remote-sensing information. The sub-debris ice ablation accounts for about 24% of the entire ice ablation, while the percentage of the moraine covered area accounts for approximately 32% of the entire glacierized area. Although the ice cliffs occupy only 1.7% of the debris covered area, the melt amount accounts for approximately 12% of the total sub-debris ablation and 2.5% of the total ablation respectively. Our study highlights the influence of debris cover on the response of the glacier terminus in a particular climate setting. Due to the fact that melt rates beyond 0.1 m of moraine cover are highly restricted, the shielding effect of the debris cover dominates over the temperature and elevation dependence of the ablation in the bare ice case. |
format |
Article in Journal/Newspaper |
author |
M. Juen C. Mayer A. Lambrecht H. Han S. Liu |
author_facet |
M. Juen C. Mayer A. Lambrecht H. Han S. Liu |
author_sort |
M. Juen |
title |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
title_short |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
title_full |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
title_fullStr |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
title_full_unstemmed |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
title_sort |
impact of varying debris cover thickness on ablation: a case study for koxkar glacier in the tien shan |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-377-2014 http://www.the-cryosphere.net/8/377/2014/tc-8-377-2014.pdf https://doaj.org/article/bd9a24cf72d4495cb484fb08c55939de |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 2, Pp 377-386 (2014) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-8-377-2014 http://www.the-cryosphere.net/8/377/2014/tc-8-377-2014.pdf https://doaj.org/article/bd9a24cf72d4495cb484fb08c55939de |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-8-377-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
2 |
container_start_page |
377 |
op_container_end_page |
386 |
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1766216467250937856 |