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 modelling. The seasonal speed-up at 79N of 0.15km/yr is suggested to be driven by a d...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/89d1d127-f337-40ac-8c14-add51c217566 https://doi.org/10.1002/2017GL074368 https://backend.orbit.dtu.dk/ws/files/138546334/Rathmann_et_al_2017_Geophysical_Research_Letters_.pdf |
id |
ftdtupubl:oai:pure.atira.dk:publications/89d1d127-f337-40ac-8c14-add51c217566 |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/89d1d127-f337-40ac-8c14-add51c217566 2024-06-23T07:53:14+00:00 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, Aslak Gudmundsson, G. Hilmar Langen, Peter L. Nielsen, K. P. Kusk, Anders 2017 application/pdf https://orbit.dtu.dk/en/publications/89d1d127-f337-40ac-8c14-add51c217566 https://doi.org/10.1002/2017GL074368 https://backend.orbit.dtu.dk/ws/files/138546334/Rathmann_et_al_2017_Geophysical_Research_Letters_.pdf eng eng https://orbit.dtu.dk/en/publications/89d1d127-f337-40ac-8c14-add51c217566 info:eu-repo/semantics/openAccess Rathmann , N M , Hvidberg , C S , Solgaard , A M , Grinsted , A , Gudmundsson , G H , 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 , vol. 44 , no. 19 , pp. 9805–9814 . https://doi.org/10.1002/2017GL074368 Remote sensing Glaciers Mass balance Ice-sheet modelling Greenland ice sheet Climate change Sea-level changes /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2017 ftdtupubl https://doi.org/10.1002/2017GL074368 2024-06-11T14:47:43Z 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 modelling. The seasonal speed-up at 79N of 0.15km/yr is suggested to be driven by a decrease in effective basal pressure induced by surface melting, whereas for Zachariae its 0.11km/yr seasonal speed-up correlates equally well with the break-up of its large ice mélange. We investigate the influence 76km 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 speed-up. 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 Ice Sheet Technical University of Denmark: DTU Orbit Greenland Geophysical Research Letters 44 19 9805 9814 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Remote sensing Glaciers Mass balance Ice-sheet modelling Greenland ice sheet Climate change Sea-level changes /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
Remote sensing Glaciers Mass balance Ice-sheet modelling Greenland ice sheet Climate change Sea-level changes /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, Aslak Gudmundsson, G. Hilmar Langen, Peter L. Nielsen, K. P. Kusk, Anders Highly temporally resolved response to seasonal surface melt of the Zachariae and 79N outlet glaciers in Northeast Greenland |
topic_facet |
Remote sensing Glaciers Mass balance Ice-sheet modelling Greenland ice sheet Climate change Sea-level changes /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
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 modelling. The seasonal speed-up at 79N of 0.15km/yr is suggested to be driven by a decrease in effective basal pressure induced by surface melting, whereas for Zachariae its 0.11km/yr seasonal speed-up correlates equally well with the break-up of its large ice mélange. We investigate the influence 76km 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 speed-up. 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, Aslak Gudmundsson, G. Hilmar Langen, Peter L. Nielsen, K. P. Kusk, Anders |
author_facet |
Rathmann, N. M. Hvidberg, C. S. Solgaard, A. M. Grinsted, Aslak Gudmundsson, G. Hilmar Langen, Peter L. Nielsen, K. P. Kusk, Anders |
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 |
publishDate |
2017 |
url |
https://orbit.dtu.dk/en/publications/89d1d127-f337-40ac-8c14-add51c217566 https://doi.org/10.1002/2017GL074368 https://backend.orbit.dtu.dk/ws/files/138546334/Rathmann_et_al_2017_Geophysical_Research_Letters_.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Rathmann , N M , Hvidberg , C S , Solgaard , A M , Grinsted , A , Gudmundsson , G H , 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 , vol. 44 , no. 19 , pp. 9805–9814 . https://doi.org/10.1002/2017GL074368 |
op_relation |
https://orbit.dtu.dk/en/publications/89d1d127-f337-40ac-8c14-add51c217566 |
op_rights |
info:eu-repo/semantics/openAccess |
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_ |
1802644806219857920 |