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 |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2017
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/518482/ https://nora.nerc.ac.uk/id/eprint/518482/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL074368 |
id |
ftnerc:oai:nora.nerc.ac.uk:518482 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:518482 2023-05-15T16:27:26+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, G.H. Langen, P.L. Nielsen, K.P. Kusk, A. 2017-10 text http://nora.nerc.ac.uk/id/eprint/518482/ https://nora.nerc.ac.uk/id/eprint/518482/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL074368 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/518482/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf Rathmann, N.M.; Hvidberg, C.S.; Solgaard, A.M.; Grinsted, A.; Gudmundsson, G.H. orcid:0000-0003-4236-5369 Langen, P.L.; Nielsen, K.P.; 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). 9805-9814. https://doi.org/10.1002/2017GL074368 <https://doi.org/10.1002/2017GL074368> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/2017GL074368 2023-02-04T19:45:42Z 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 Natural Environment Research Council: NERC Open Research Archive Greenland Geophysical Research Letters 44 19 9805 9814 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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, G.H. Langen, P.L. Nielsen, K.P. Kusk, A. |
spellingShingle |
Rathmann, N.M. Hvidberg, C.S. Solgaard, A.M. Grinsted, A. Gudmundsson, G.H. 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 |
author_facet |
Rathmann, N.M. Hvidberg, C.S. Solgaard, A.M. Grinsted, A. Gudmundsson, G.H. 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 |
http://nora.nerc.ac.uk/id/eprint/518482/ https://nora.nerc.ac.uk/id/eprint/518482/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL074368 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://nora.nerc.ac.uk/id/eprint/518482/1/Rathmann_et_al-2017-Geophysical_Research_Letters.pdf Rathmann, N.M.; Hvidberg, C.S.; Solgaard, A.M.; Grinsted, A.; Gudmundsson, G.H. orcid:0000-0003-4236-5369 Langen, P.L.; Nielsen, K.P.; 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). 9805-9814. https://doi.org/10.1002/2017GL074368 <https://doi.org/10.1002/2017GL074368> |
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 |
_version_ |
1766016617535242240 |