Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard
We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-...
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ftulaplandcdispu:oai:lacris.ulapland.fi:publications/e3be261a-3022-4898-ab7a-eed306014b0b 2024-01-28T10:04:36+01:00 Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard Gong, Yongmei Zwinger, Thomas Cornford, Stephen L. Gladstone, Rupert Schäfer, Martina Moore, John C. 2017 https://research.ulapland.fi/fi/publications/e3be261a-3022-4898-ab7a-eed306014b0b https://doi.org/10.1017/jog.2016.121 eng eng https://research.ulapland.fi/fi/publications/e3be261a-3022-4898-ab7a-eed306014b0b info:eu-repo/semantics/openAccess Gong , Y , Zwinger , T , Cornford , S L , Gladstone , R , Schäfer , M & Moore , J C 2017 , ' Importance of basal boundary conditions in transient simulations : Case study of a surging marine-terminating glacier on Austfonna, Svalbard ' , Journal of Glaciology , vol. 63 , no. 237 , pp. 106-117 . https://doi.org/10.1017/jog.2016.121 /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences article 2017 ftulaplandcdispu https://doi.org/10.1017/jog.2016.121 2024-01-04T00:03:10Z We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-varying surface mass-balance data from the regional climate model HIRHAM5 are downscaled according to elevation. Basal friction coefficient is varied through time by interpolating between two data-constrained inversions of surface velocity fields, from 1995 and 2011. Evolution of the basal boundary condition appears to be much more important for mass discharge and the dynamic response of the fast flowing unit in Basin 3 than either model choice or the downscaling method for the surface mass balance. In addition, temporally linear extrapolation of the evolution of basal friction coefficient beyond the 2011 distribution could not reproduce the expansion of the acceleration observed in southern Basin 3 between January 2012 and June 2013. This implies that changes in basal friction patterns, and in turn basal processes that are not currently represented in either model, are among the most important factors for the 2012 acceleration. Article in Journal/Newspaper Austfonna glacier Ice cap Journal of Glaciology Svalbard LaCRIS - University of Lapland Current Research System Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Svalbard Journal of Glaciology 63 237 106 117 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
spellingShingle |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences Gong, Yongmei Zwinger, Thomas Cornford, Stephen L. Gladstone, Rupert Schäfer, Martina Moore, John C. Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
topic_facet |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
description |
We assess the importance of basal boundary conditions for transient simulations of Basin 3, Austfonna ice cap between January 1995 and December 2011 and for the surge starting in 2012 by carrying out simulations with the full-Stokes model Elmer/Ice and the vertically-integrated model BISICLES. Time-varying surface mass-balance data from the regional climate model HIRHAM5 are downscaled according to elevation. Basal friction coefficient is varied through time by interpolating between two data-constrained inversions of surface velocity fields, from 1995 and 2011. Evolution of the basal boundary condition appears to be much more important for mass discharge and the dynamic response of the fast flowing unit in Basin 3 than either model choice or the downscaling method for the surface mass balance. In addition, temporally linear extrapolation of the evolution of basal friction coefficient beyond the 2011 distribution could not reproduce the expansion of the acceleration observed in southern Basin 3 between January 2012 and June 2013. This implies that changes in basal friction patterns, and in turn basal processes that are not currently represented in either model, are among the most important factors for the 2012 acceleration. |
format |
Article in Journal/Newspaper |
author |
Gong, Yongmei Zwinger, Thomas Cornford, Stephen L. Gladstone, Rupert Schäfer, Martina Moore, John C. |
author_facet |
Gong, Yongmei Zwinger, Thomas Cornford, Stephen L. Gladstone, Rupert Schäfer, Martina Moore, John C. |
author_sort |
Gong, Yongmei |
title |
Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_short |
Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_full |
Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_fullStr |
Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_full_unstemmed |
Importance of basal boundary conditions in transient simulations:Case study of a surging marine-terminating glacier on Austfonna, Svalbard |
title_sort |
importance of basal boundary conditions in transient simulations:case study of a surging marine-terminating glacier on austfonna, svalbard |
publishDate |
2017 |
url |
https://research.ulapland.fi/fi/publications/e3be261a-3022-4898-ab7a-eed306014b0b https://doi.org/10.1017/jog.2016.121 |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) |
geographic |
Austfonna Svalbard |
geographic_facet |
Austfonna Svalbard |
genre |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
genre_facet |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
op_source |
Gong , Y , Zwinger , T , Cornford , S L , Gladstone , R , Schäfer , M & Moore , J C 2017 , ' Importance of basal boundary conditions in transient simulations : Case study of a surging marine-terminating glacier on Austfonna, Svalbard ' , Journal of Glaciology , vol. 63 , no. 237 , pp. 106-117 . https://doi.org/10.1017/jog.2016.121 |
op_relation |
https://research.ulapland.fi/fi/publications/e3be261a-3022-4898-ab7a-eed306014b0b |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2016.121 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
237 |
container_start_page |
106 |
op_container_end_page |
117 |
_version_ |
1789330374971621376 |