Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream
The accelerated ice flow of ice streams that reach far into the interior of the ice sheets is associated with lubrication of the ice sheet base by basal meltwater. However, the amount of basal melting under the large ice streams – such as the Northeast Greenland Ice Stream (NEGIS) – is largely unkno...
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00057352 2024-09-15T18:07:46+00:00 Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream Zeising, Ole Humbert, Angelika 2021-07 electronic https://doi.org/10.5194/tc-15-3119-2021 https://noa.gwlb.de/receive/cop_mods_00057352 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057002/tc-15-3119-2021.pdf https://tc.copernicus.org/articles/15/3119/2021/tc-15-3119-2021.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-15-3119-2021 https://noa.gwlb.de/receive/cop_mods_00057352 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057002/tc-15-3119-2021.pdf https://tc.copernicus.org/articles/15/3119/2021/tc-15-3119-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-3119-2021 2024-06-26T04:38:21Z The accelerated ice flow of ice streams that reach far into the interior of the ice sheets is associated with lubrication of the ice sheet base by basal meltwater. However, the amount of basal melting under the large ice streams – such as the Northeast Greenland Ice Stream (NEGIS) – is largely unknown. In situ measurements of basal melt rates are important from various perspectives as they indicate the heat budget, the hydrological regime and the relative importance of sliding in glacier motion. The few previous estimates of basal melt rates in the NEGIS region were 0.1 m a−1 and more, based on radiostratigraphy methods. These findings raised the question of the heat source, since even an increased geothermal heat flux could not deliver the necessary amount of heat. Here, we present basal melt rates at the recent deep drill site EastGRIP, located in the centre of NEGIS. Within 2 subsequent years, we found basal melt rates of 0.19±0.04 m a−1 that are based on analysis of repeated phase-sensitive radar measurements. In order to quantify the contribution of processes that contribute to melting, we carried out an assessment of the energy balance at the interface and found the subglacial water system to play a key role in facilitating such high melt rates. Article in Journal/Newspaper glacier Greenland Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 15 7 3119 3128 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Zeising, Ole Humbert, Angelika Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
topic_facet |
article Verlagsveröffentlichung |
description |
The accelerated ice flow of ice streams that reach far into the interior of the ice sheets is associated with lubrication of the ice sheet base by basal meltwater. However, the amount of basal melting under the large ice streams – such as the Northeast Greenland Ice Stream (NEGIS) – is largely unknown. In situ measurements of basal melt rates are important from various perspectives as they indicate the heat budget, the hydrological regime and the relative importance of sliding in glacier motion. The few previous estimates of basal melt rates in the NEGIS region were 0.1 m a−1 and more, based on radiostratigraphy methods. These findings raised the question of the heat source, since even an increased geothermal heat flux could not deliver the necessary amount of heat. Here, we present basal melt rates at the recent deep drill site EastGRIP, located in the centre of NEGIS. Within 2 subsequent years, we found basal melt rates of 0.19±0.04 m a−1 that are based on analysis of repeated phase-sensitive radar measurements. In order to quantify the contribution of processes that contribute to melting, we carried out an assessment of the energy balance at the interface and found the subglacial water system to play a key role in facilitating such high melt rates. |
format |
Article in Journal/Newspaper |
author |
Zeising, Ole Humbert, Angelika |
author_facet |
Zeising, Ole Humbert, Angelika |
author_sort |
Zeising, Ole |
title |
Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
title_short |
Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
title_full |
Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
title_fullStr |
Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
title_full_unstemmed |
Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
title_sort |
indication of high basal melting at the eastgrip drill site on the northeast greenland ice stream |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-3119-2021 https://noa.gwlb.de/receive/cop_mods_00057352 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057002/tc-15-3119-2021.pdf https://tc.copernicus.org/articles/15/3119/2021/tc-15-3119-2021.pdf |
genre |
glacier Greenland Ice Sheet The Cryosphere |
genre_facet |
glacier Greenland Ice Sheet 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-15-3119-2021 https://noa.gwlb.de/receive/cop_mods_00057352 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057002/tc-15-3119-2021.pdf https://tc.copernicus.org/articles/15/3119/2021/tc-15-3119-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-3119-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
7 |
container_start_page |
3119 |
op_container_end_page |
3128 |
_version_ |
1810445132823003136 |