Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland
Observations remain sparse for peripheral glaciers and ice caps in Greenland. Here, we present the results of a multi-frequency radar survey of Lyngmarksbræen Ice Cap in West Greenland conducted in April 2017. Radar measurements show thick ice of up to ~120 m in subglacial valleys associated with th...
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Cambridge University Press
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Online Access: | https://hdl.handle.net/11250/3125414 https://doi.org/10.1017/jog.2023.89 |
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fthsvestlandet:oai:hvlopen.brage.unit.no:11250/3125414 2024-09-15T18:09:01+00:00 Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland Gillespie, Mette Kusk Yde, Jacob Clement Andresen, Marit Svarstad Citterio, Michele Gillespie, Mark Andrew 2023 application/pdf https://hdl.handle.net/11250/3125414 https://doi.org/10.1017/jog.2023.89 eng eng Cambridge University Press urn:issn:0022-1430 https://hdl.handle.net/11250/3125414 https://doi.org/10.1017/jog.2023.89 cristin:2205023 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s), 2023 13 Journal of Glaciology Peer reviewed Journal article 2023 fthsvestlandet https://doi.org/10.1017/jog.2023.89 2024-08-06T09:22:16Z Observations remain sparse for peripheral glaciers and ice caps in Greenland. Here, we present the results of a multi-frequency radar survey of Lyngmarksbræen Ice Cap in West Greenland conducted in April 2017. Radar measurements show thick ice of up to ~120 m in subglacial valleys associated with the largest outlet glaciers, while relatively thin ice cover the upper plateau ice divides, suggesting future vulnerability to ice cap fragmentation. At the time of the radar survey, Lyngmarksbræen Ice Cap had a total volume of 0.82 ± 0.1 km3. Measurements show a 1.5–2 m thick end-of-winter snowpack, and that firn is largely absent, signifying a prolonged period of negative mass balance for most of the ice cap. The thermal regime of Lyngmarksbræen Ice Cap is investigated through analysis of scattering observed along radar profiles. Results show that the ice cap is largely below the pressure melting point, but that temperate ice exists both in deep basal pockets and in shallow zones that some places extend from ~15 m depth and to the ice base. The distribution of shallow temperate ice appears unrelated to variations in ice thickness; instead we find a strong correlation to the presence of nearby surface crevasses. publishedVersion Article in Journal/Newspaper Greenland Ice cap Journal of Glaciology Høgskulen på Vestlandet: HVL Open Journal of Glaciology 1 13 |
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Høgskulen på Vestlandet: HVL Open |
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fthsvestlandet |
language |
English |
description |
Observations remain sparse for peripheral glaciers and ice caps in Greenland. Here, we present the results of a multi-frequency radar survey of Lyngmarksbræen Ice Cap in West Greenland conducted in April 2017. Radar measurements show thick ice of up to ~120 m in subglacial valleys associated with the largest outlet glaciers, while relatively thin ice cover the upper plateau ice divides, suggesting future vulnerability to ice cap fragmentation. At the time of the radar survey, Lyngmarksbræen Ice Cap had a total volume of 0.82 ± 0.1 km3. Measurements show a 1.5–2 m thick end-of-winter snowpack, and that firn is largely absent, signifying a prolonged period of negative mass balance for most of the ice cap. The thermal regime of Lyngmarksbræen Ice Cap is investigated through analysis of scattering observed along radar profiles. Results show that the ice cap is largely below the pressure melting point, but that temperate ice exists both in deep basal pockets and in shallow zones that some places extend from ~15 m depth and to the ice base. The distribution of shallow temperate ice appears unrelated to variations in ice thickness; instead we find a strong correlation to the presence of nearby surface crevasses. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Gillespie, Mette Kusk Yde, Jacob Clement Andresen, Marit Svarstad Citterio, Michele Gillespie, Mark Andrew |
spellingShingle |
Gillespie, Mette Kusk Yde, Jacob Clement Andresen, Marit Svarstad Citterio, Michele Gillespie, Mark Andrew Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
author_facet |
Gillespie, Mette Kusk Yde, Jacob Clement Andresen, Marit Svarstad Citterio, Michele Gillespie, Mark Andrew |
author_sort |
Gillespie, Mette Kusk |
title |
Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
title_short |
Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
title_full |
Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
title_fullStr |
Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
title_full_unstemmed |
Ice geometry and thermal regime of Lyngmarksbræen Ice Cap, West Greenland |
title_sort |
ice geometry and thermal regime of lyngmarksbræen ice cap, west greenland |
publisher |
Cambridge University Press |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3125414 https://doi.org/10.1017/jog.2023.89 |
genre |
Greenland Ice cap Journal of Glaciology |
genre_facet |
Greenland Ice cap Journal of Glaciology |
op_source |
13 Journal of Glaciology |
op_relation |
urn:issn:0022-1430 https://hdl.handle.net/11250/3125414 https://doi.org/10.1017/jog.2023.89 cristin:2205023 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © The Author(s), 2023 |
op_doi |
https://doi.org/10.1017/jog.2023.89 |
container_title |
Journal of Glaciology |
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1 |
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13 |
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1810446399713574912 |