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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ftunivtasecite:oai:ecite.utas.edu.au:123496 2023-05-15T15:33:55+02:00 Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard Gong, Y Zwinger, T Cornford, S Gladstone, R Schafer, M Moore, JC 2017 application/pdf https://doi.org/10.1017/jog.2016.121 http://ecite.utas.edu.au/123496 en eng Int Glaciol Soc http://ecite.utas.edu.au/123496/1/Gong et al 2017.pdf http://dx.doi.org/10.1017/jog.2016.121 Gong, Y and Zwinger, T and Cornford, S and Gladstone, R and Schafer, M and Moore, JC, Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard, Journal of Glaciology, 63, (237) pp. 106-117. ISSN 0022-1430 (2017) [Refereed Article] http://ecite.utas.edu.au/123496 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1017/jog.2016.121 2019-12-13T22:22:15Z 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 eCite UTAS (University of Tasmania) Svalbard Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Journal of Glaciology 63 237 106 117 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Gong, Y Zwinger, T Cornford, S Gladstone, R Schafer, M Moore, JC Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
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, Y Zwinger, T Cornford, S Gladstone, R Schafer, M Moore, JC |
author_facet |
Gong, Y Zwinger, T Cornford, S Gladstone, R Schafer, M Moore, JC |
author_sort |
Gong, Y |
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 |
publisher |
Int Glaciol Soc |
publishDate |
2017 |
url |
https://doi.org/10.1017/jog.2016.121 http://ecite.utas.edu.au/123496 |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) |
geographic |
Svalbard Austfonna |
geographic_facet |
Svalbard Austfonna |
genre |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
genre_facet |
Austfonna glacier Ice cap Journal of Glaciology Svalbard |
op_relation |
http://ecite.utas.edu.au/123496/1/Gong et al 2017.pdf http://dx.doi.org/10.1017/jog.2016.121 Gong, Y and Zwinger, T and Cornford, S and Gladstone, R and Schafer, M and Moore, JC, Importance of basal boundary conditions in transient simulations: case study of a surging marine-terminating glacier on Austfonna, Svalbard, Journal of Glaciology, 63, (237) pp. 106-117. ISSN 0022-1430 (2017) [Refereed Article] http://ecite.utas.edu.au/123496 |
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_ |
1766364508160262144 |