Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland
The seasonal response to surface melting of the Northeast Greenland Ice Stream outlets, Zachariae and 79N, is investigated using new highly temporally resolved surface velocity maps for 2016 combined with numerical modeling. The seasonal speedup at 79N of 0.15 km/yr is suggested to be driven by a de...
Published in: | Geophysical Research Letters |
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Language: | English |
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American Geophysical Union
2017
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/34630/ https://doi.org/10.1002/2017GL074368 https://nrl.northumbria.ac.uk/id/eprint/34630/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:34630 2023-05-15T16:27:41+02:00 Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, A. Gudmundsson, Hilmar Langen, P. L. Nielsen, K. P. Kusk, A. 2017-10-16 text https://nrl.northumbria.ac.uk/id/eprint/34630/ https://doi.org/10.1002/2017GL074368 https://nrl.northumbria.ac.uk/id/eprint/34630/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf en eng American Geophysical Union https://nrl.northumbria.ac.uk/id/eprint/34630/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf Rathmann, N. M., Hvidberg, C. S., Solgaard, A. M., Grinsted, A., Gudmundsson, Hilmar, Langen, P. L., Nielsen, K. P. and Kusk, A. (2017) Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland. Geophysical Research Letters, 44 (19). pp. 9805-9814. ISSN 0094-8276 F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2017 ftunivnorthumb https://doi.org/10.1002/2017GL074368 2022-09-25T06:07:28Z The seasonal response to surface melting of the Northeast Greenland Ice Stream outlets, Zachariae and 79N, is investigated using new highly temporally resolved surface velocity maps for 2016 combined with numerical modeling. The seasonal speedup at 79N of 0.15 km/yr is suggested to be driven by a decrease in effective basal pressure induced by surface melting, whereas for Zachariae its 0.11 km/yr seasonal speedup correlates equally well with the breakup of its large ice mélange. We investigate the influence 76 km long floating tongue at 79N, finding it provides little resistance and that most of it could be lost without impacting the dynamics of the area. Furthermore, we show that reducing the slipperiness along the tongue‐wall interfaces produces a velocity change spatially inconsistent with the observed seasonal speedup. Finally, we find that subglacial sticky spots such as bedrock bumps play a negligible role in the large‐scale response to a seasonally enhanced basal slipperiness of the region. Article in Journal/Newspaper Greenland Northumbria University, Newcastle: Northumbria Research Link (NRL) Greenland Geophysical Research Letters 44 19 9805 9814 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, A. Gudmundsson, Hilmar Langen, P. L. Nielsen, K. P. Kusk, A. Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
The seasonal response to surface melting of the Northeast Greenland Ice Stream outlets, Zachariae and 79N, is investigated using new highly temporally resolved surface velocity maps for 2016 combined with numerical modeling. The seasonal speedup at 79N of 0.15 km/yr is suggested to be driven by a decrease in effective basal pressure induced by surface melting, whereas for Zachariae its 0.11 km/yr seasonal speedup correlates equally well with the breakup of its large ice mélange. We investigate the influence 76 km long floating tongue at 79N, finding it provides little resistance and that most of it could be lost without impacting the dynamics of the area. Furthermore, we show that reducing the slipperiness along the tongue‐wall interfaces produces a velocity change spatially inconsistent with the observed seasonal speedup. Finally, we find that subglacial sticky spots such as bedrock bumps play a negligible role in the large‐scale response to a seasonally enhanced basal slipperiness of the region. |
format |
Article in Journal/Newspaper |
author |
Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, A. Gudmundsson, Hilmar Langen, P. L. Nielsen, K. P. Kusk, A. |
author_facet |
Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, A. Gudmundsson, Hilmar Langen, P. L. Nielsen, K. P. Kusk, A. |
author_sort |
Rathmann, N. M. |
title |
Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
title_short |
Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
title_full |
Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
title_fullStr |
Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
title_full_unstemmed |
Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland |
title_sort |
highly temporally resolved response to seasonal surface melt of the zachariae and 79n outlet glaciers in northeast greenland |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
https://nrl.northumbria.ac.uk/id/eprint/34630/ https://doi.org/10.1002/2017GL074368 https://nrl.northumbria.ac.uk/id/eprint/34630/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/34630/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf Rathmann, N. M., Hvidberg, C. S., Solgaard, A. M., Grinsted, A., Gudmundsson, Hilmar, Langen, P. L., Nielsen, K. P. and Kusk, A. (2017) Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in northeast Greenland. Geophysical Research Letters, 44 (19). pp. 9805-9814. ISSN 0094-8276 |
op_doi |
https://doi.org/10.1002/2017GL074368 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
19 |
container_start_page |
9805 |
op_container_end_page |
9814 |
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1766017138670174208 |