The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study
The mechanisms causing widespread flow acceleration of Jakobshavn Isbræ, West Greenland, remain unclear despite an abundance of observations and modeling studies. Here we simulate the glacier's evolution from 1985 to 2016 using a three-dimensional thermomechanical ice flow model. The model capt...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Wiley
2017
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/45522/ https://hdl.handle.net/10013/epic.51618 |
id |
ftawi:oai:epic.awi.de:45522 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:45522 2023-05-15T16:21:27+02:00 The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study Bondzio, Johannes Morlighem, Mathieu Seroussi, Hélène Kleiner, Thomas Rückamp, Martin Mouginot, J. Moon, Twila Humbert, Angelika Larour, Eric 2017 https://epic.awi.de/id/eprint/45522/ https://hdl.handle.net/10013/epic.51618 unknown Wiley Bondzio, J. , Morlighem, M. , Seroussi, H. , Kleiner, T. orcid:0000-0001-7825-5765 , Rückamp, M. orcid:0000-0003-2512-7238 , Mouginot, J. , Moon, T. , Humbert, A. and Larour, E. (2017) The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study , Geophysical Research Letters, 44 , pp. 6252-6260 . doi:10.1002/2017GL073309 <https://doi.org/10.1002/2017GL073309> , hdl:10013/epic.51618 EPIC3Geophysical Research Letters, Wiley, 44, pp. 6252-6260, ISSN: 0094-8276 Article isiRev 2017 ftawi https://doi.org/10.1002/2017GL073309 2021-12-24T15:43:17Z The mechanisms causing widespread flow acceleration of Jakobshavn Isbræ, West Greenland, remain unclear despite an abundance of observations and modeling studies. Here we simulate the glacier's evolution from 1985 to 2016 using a three-dimensional thermomechanical ice flow model. The model captures the timing and 90% of the observed changes by forcing the calving front. Basal drag in the trough is low, and lateral drag balances the ice stream's driving stress. The calving front position is the dominant control on changes of Jakobshavn Isbræ since the ice viscosity in the shear margins instantaneously drops in response to the stress perturbation caused by calving front retreat, which allows for widespread flow acceleration. Gradual shear margin warming contributes 5 to 10% to the total acceleration. Our simulations suggest that the glacier will contribute to eustatic sea level rise at a rate comparable to or higher than at present. Article in Journal/Newspaper glacier Greenland Jakobshavn Jakobshavn isbræ Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) Geophysical Research Letters 44 12 6252 6260 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The mechanisms causing widespread flow acceleration of Jakobshavn Isbræ, West Greenland, remain unclear despite an abundance of observations and modeling studies. Here we simulate the glacier's evolution from 1985 to 2016 using a three-dimensional thermomechanical ice flow model. The model captures the timing and 90% of the observed changes by forcing the calving front. Basal drag in the trough is low, and lateral drag balances the ice stream's driving stress. The calving front position is the dominant control on changes of Jakobshavn Isbræ since the ice viscosity in the shear margins instantaneously drops in response to the stress perturbation caused by calving front retreat, which allows for widespread flow acceleration. Gradual shear margin warming contributes 5 to 10% to the total acceleration. Our simulations suggest that the glacier will contribute to eustatic sea level rise at a rate comparable to or higher than at present. |
format |
Article in Journal/Newspaper |
author |
Bondzio, Johannes Morlighem, Mathieu Seroussi, Hélène Kleiner, Thomas Rückamp, Martin Mouginot, J. Moon, Twila Humbert, Angelika Larour, Eric |
spellingShingle |
Bondzio, Johannes Morlighem, Mathieu Seroussi, Hélène Kleiner, Thomas Rückamp, Martin Mouginot, J. Moon, Twila Humbert, Angelika Larour, Eric The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
author_facet |
Bondzio, Johannes Morlighem, Mathieu Seroussi, Hélène Kleiner, Thomas Rückamp, Martin Mouginot, J. Moon, Twila Humbert, Angelika Larour, Eric |
author_sort |
Bondzio, Johannes |
title |
The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
title_short |
The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
title_full |
The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
title_fullStr |
The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
title_full_unstemmed |
The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study |
title_sort |
mechanisms behind jakobshavn isbræ’s acceleration and mass loss: a 3-d thermomechanical model study |
publisher |
Wiley |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/45522/ https://hdl.handle.net/10013/epic.51618 |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Greenland Jakobshavn Isbræ |
geographic_facet |
Greenland Jakobshavn Isbræ |
genre |
glacier Greenland Jakobshavn Jakobshavn isbræ |
genre_facet |
glacier Greenland Jakobshavn Jakobshavn isbræ |
op_source |
EPIC3Geophysical Research Letters, Wiley, 44, pp. 6252-6260, ISSN: 0094-8276 |
op_relation |
Bondzio, J. , Morlighem, M. , Seroussi, H. , Kleiner, T. orcid:0000-0001-7825-5765 , Rückamp, M. orcid:0000-0003-2512-7238 , Mouginot, J. , Moon, T. , Humbert, A. and Larour, E. (2017) The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study , Geophysical Research Letters, 44 , pp. 6252-6260 . doi:10.1002/2017GL073309 <https://doi.org/10.1002/2017GL073309> , hdl:10013/epic.51618 |
op_doi |
https://doi.org/10.1002/2017GL073309 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
12 |
container_start_page |
6252 |
op_container_end_page |
6260 |
_version_ |
1766009449639575552 |