Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar
Proglacial icings accumulate in front of many High Arctic glaciers during the winter months, as water escapes from englacial or subglacial storage. Such icings have been interpreted as evidence for warm-based subglacial conditions, but several are now known to occur in front of cold-based glaciers....
Published in: | The Cryosphere |
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Copernicus Publications
2011
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00027717 2023-05-15T15:09:23+02:00 Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar Bælum, K. Benn, D. I. 2011-03 electronic https://doi.org/10.5194/tc-5-139-2011 https://noa.gwlb.de/receive/cop_mods_00027717 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00027672/tc-5-139-2011.pdf https://tc.copernicus.org/articles/5/139/2011/tc-5-139-2011.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-5-139-2011 https://noa.gwlb.de/receive/cop_mods_00027717 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00027672/tc-5-139-2011.pdf https://tc.copernicus.org/articles/5/139/2011/tc-5-139-2011.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2011 ftnonlinearchiv https://doi.org/10.5194/tc-5-139-2011 2022-02-08T22:48:32Z Proglacial icings accumulate in front of many High Arctic glaciers during the winter months, as water escapes from englacial or subglacial storage. Such icings have been interpreted as evidence for warm-based subglacial conditions, but several are now known to occur in front of cold-based glaciers. In this study, we investigate the drainage system of Tellbreen, a 3.5 km long glacier in central Spitsbergen, where a large proglacial icing develops each winter, to determine the location and geometry of storage elements. Digital elevation models (DEMs) of the glacier surface and bed were constructed using maps, differential GPS and ground penetrating radar (GPR). Rates of surface lowering indicate that the glacier has a long-term mass balance of −0.6 ± 0.2 m/year. Englacial and subglacial drainage channels were mapped using GPR, showing that Tellbreen has a diverse drainage system that is capable of storing, transporting and releasing water year round. In the upper part of the glacier, drainage is mainly via supraglacial channels. These transition downglacier into shallow englacial "cut and closure" channels, formed by the incision and roof closure of supraglacial channels. Below thin ice near the terminus, these channels reach the bed and contain stored water throughout the winter months. Even though no signs of temperate ice were detected and the bed is below pressure-melting point, Tellbreen has a surface-fed, channelized subglacial drainage system, which allows significant storage and delayed discharge. Article in Journal/Newspaper Arctic glacier Long Glacier Svalbard The Cryosphere Spitsbergen Niedersächsisches Online-Archiv NOA Arctic Long Glacier ENVELOPE(-96.717,-96.717,-72.500,-72.500) Svalbard Tellbreen ENVELOPE(16.217,16.217,78.250,78.250) The Cryosphere 5 1 139 149 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Bælum, K. Benn, D. I. Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
topic_facet |
article Verlagsveröffentlichung |
description |
Proglacial icings accumulate in front of many High Arctic glaciers during the winter months, as water escapes from englacial or subglacial storage. Such icings have been interpreted as evidence for warm-based subglacial conditions, but several are now known to occur in front of cold-based glaciers. In this study, we investigate the drainage system of Tellbreen, a 3.5 km long glacier in central Spitsbergen, where a large proglacial icing develops each winter, to determine the location and geometry of storage elements. Digital elevation models (DEMs) of the glacier surface and bed were constructed using maps, differential GPS and ground penetrating radar (GPR). Rates of surface lowering indicate that the glacier has a long-term mass balance of −0.6 ± 0.2 m/year. Englacial and subglacial drainage channels were mapped using GPR, showing that Tellbreen has a diverse drainage system that is capable of storing, transporting and releasing water year round. In the upper part of the glacier, drainage is mainly via supraglacial channels. These transition downglacier into shallow englacial "cut and closure" channels, formed by the incision and roof closure of supraglacial channels. Below thin ice near the terminus, these channels reach the bed and contain stored water throughout the winter months. Even though no signs of temperate ice were detected and the bed is below pressure-melting point, Tellbreen has a surface-fed, channelized subglacial drainage system, which allows significant storage and delayed discharge. |
format |
Article in Journal/Newspaper |
author |
Bælum, K. Benn, D. I. |
author_facet |
Bælum, K. Benn, D. I. |
author_sort |
Bælum, K. |
title |
Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
title_short |
Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
title_full |
Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
title_fullStr |
Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
title_full_unstemmed |
Thermal structure and drainage system of a small valley glacier (Tellbreen, Svalbard), investigated by ground penetrating radar |
title_sort |
thermal structure and drainage system of a small valley glacier (tellbreen, svalbard), investigated by ground penetrating radar |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/tc-5-139-2011 https://noa.gwlb.de/receive/cop_mods_00027717 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00027672/tc-5-139-2011.pdf https://tc.copernicus.org/articles/5/139/2011/tc-5-139-2011.pdf |
long_lat |
ENVELOPE(-96.717,-96.717,-72.500,-72.500) ENVELOPE(16.217,16.217,78.250,78.250) |
geographic |
Arctic Long Glacier Svalbard Tellbreen |
geographic_facet |
Arctic Long Glacier Svalbard Tellbreen |
genre |
Arctic glacier Long Glacier Svalbard The Cryosphere Spitsbergen |
genre_facet |
Arctic glacier Long Glacier Svalbard The Cryosphere Spitsbergen |
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-5-139-2011 https://noa.gwlb.de/receive/cop_mods_00027717 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00027672/tc-5-139-2011.pdf https://tc.copernicus.org/articles/5/139/2011/tc-5-139-2011.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-5-139-2011 |
container_title |
The Cryosphere |
container_volume |
5 |
container_issue |
1 |
container_start_page |
139 |
op_container_end_page |
149 |
_version_ |
1766340585486024704 |