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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Online Access: | https://epic.awi.de/id/eprint/56008/ https://epic.awi.de/id/eprint/56008/1/tc-15-3119-2021.pdf https://hdl.handle.net/10013/epic.c8acd98f-7ef9-4c67-b8a3-359f93d75890 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:56008 2023-05-15T16:21:25+02:00 Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream Zeising, Ole Humbert, Angelika 2021-07-06 application/pdf https://epic.awi.de/id/eprint/56008/ https://epic.awi.de/id/eprint/56008/1/tc-15-3119-2021.pdf https://hdl.handle.net/10013/epic.c8acd98f-7ef9-4c67-b8a3-359f93d75890 https://hdl.handle.net/ unknown Copernicus Publications https://epic.awi.de/id/eprint/56008/1/tc-15-3119-2021.pdf https://hdl.handle.net/ Zeising, O. orcid:0000-0002-1284-8098 and Humbert, A. orcid:0000-0002-0244-8760 (2021) Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream , The Cryosphere, 15 , pp. 3119-3128 . doi:10.5194/tc-15-3119-2021 <https://doi.org/10.5194/tc-15-3119-2021> , hdl:10013/epic.c8acd98f-7ef9-4c67-b8a3-359f93d75890 EPIC3The Cryosphere, Copernicus Publications, 15, pp. 3119-3128 Article isiRev 2021 ftawi https://doi.org/10.5194/tc-15-3119-2021 2022-05-15T23:10:21Z 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 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 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland The Cryosphere 15 7 3119 3128 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 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 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 |
spellingShingle |
Zeising, Ole Humbert, Angelika Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream |
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://epic.awi.de/id/eprint/56008/ https://epic.awi.de/id/eprint/56008/1/tc-15-3119-2021.pdf https://hdl.handle.net/10013/epic.c8acd98f-7ef9-4c67-b8a3-359f93d75890 https://hdl.handle.net/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet The Cryosphere |
genre_facet |
glacier Greenland Ice Sheet The Cryosphere |
op_source |
EPIC3The Cryosphere, Copernicus Publications, 15, pp. 3119-3128 |
op_relation |
https://epic.awi.de/id/eprint/56008/1/tc-15-3119-2021.pdf https://hdl.handle.net/ Zeising, O. orcid:0000-0002-1284-8098 and Humbert, A. orcid:0000-0002-0244-8760 (2021) Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream , The Cryosphere, 15 , pp. 3119-3128 . doi:10.5194/tc-15-3119-2021 <https://doi.org/10.5194/tc-15-3119-2021> , hdl:10013/epic.c8acd98f-7ef9-4c67-b8a3-359f93d75890 |
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_ |
1766009419439538176 |