Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM
Tidewater glacier velocity and mass balance are known to be highly responsive to terminus position change. Yet it remains challenging for ice flow models to reproduce observed ice margin changes. Here, using the Ice Sheet System Model (ISSM; Larour et al., 2012), we simulate the ice velocity and thi...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://orbit.dtu.dk/en/publications/1515b0de-299a-498e-91c8-d3dc6a32f189 https://doi.org/10.5194/tc-12-1511-2018 https://backend.orbit.dtu.dk/ws/files/148215725/tc_12_1511_2018.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/1515b0de-299a-498e-91c8-d3dc6a32f189 2023-10-25T01:38:48+02:00 Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM Haubner, Konstanze Box, Jason E. Schlegel, Nicole J. Larour, Eric Y. Morlighem, Mathieu Solgaard, Anne M. Kjeldsen, Kristian K. Larsen, Signe H. Rignot, Eric Dupont, Todd K. Kjaer, Kurt H. 2018 application/pdf https://orbit.dtu.dk/en/publications/1515b0de-299a-498e-91c8-d3dc6a32f189 https://doi.org/10.5194/tc-12-1511-2018 https://backend.orbit.dtu.dk/ws/files/148215725/tc_12_1511_2018.pdf eng eng info:eu-repo/semantics/openAccess Haubner , K , Box , J E , Schlegel , N J , Larour , E Y , Morlighem , M , Solgaard , A M , Kjeldsen , K K , Larsen , S H , Rignot , E , Dupont , T K & Kjaer , K H 2018 , ' Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM ' , Cryosphere , vol. 12 , no. 4 , pp. 1511-1522 . https://doi.org/10.5194/tc-12-1511-2018 article 2018 ftdtupubl https://doi.org/10.5194/tc-12-1511-2018 2023-09-27T22:57:21Z Tidewater glacier velocity and mass balance are known to be highly responsive to terminus position change. Yet it remains challenging for ice flow models to reproduce observed ice margin changes. Here, using the Ice Sheet System Model (ISSM; Larour et al., 2012), we simulate the ice velocity and thickness changes of Upernavik Isstrom (north-western Greenland) by prescribing a collection of 27 observed terminus positions spanning 164 years (18492012). The simulation shows increased ice velocity during the 1930s, the late 1970s and between 1995 and 2012 when terminus retreat was observed along with negative surface mass balance anomalies. Three distinct mass balance states are evident in the reconstruction: (1849-1932) with near zero mass balance, (1932-1992) with ice mass loss dominated by ice dynamical flow, and (1998-2012), when increased retreat and negative surface mass balance anomalies led to mass loss that was twice that of any earlier period. Over the multi-decadal simulation, mass loss was dominated by thinning and acceleration responsible for 70% of the total mass loss induced by prescribed change in terminus position. The remaining 30% of the total ice mass loss resulted directly from prescribed terminus retreat and decreasing surface mass balance. Although the method can not explain the cause of glacier retreat, it enables the reconstruction of ice flow and geometry during 1849-2012. Given annual or seasonal ob-served terminus front positions, this method could be a useful tool for evaluating simulations investigating the effect of calving laws. Article in Journal/Newspaper glacier Greenland Ice Sheet Tidewater Upernavik Technical University of Denmark: DTU Orbit Greenland The Cryosphere 12 4 1511 1522 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Tidewater glacier velocity and mass balance are known to be highly responsive to terminus position change. Yet it remains challenging for ice flow models to reproduce observed ice margin changes. Here, using the Ice Sheet System Model (ISSM; Larour et al., 2012), we simulate the ice velocity and thickness changes of Upernavik Isstrom (north-western Greenland) by prescribing a collection of 27 observed terminus positions spanning 164 years (18492012). The simulation shows increased ice velocity during the 1930s, the late 1970s and between 1995 and 2012 when terminus retreat was observed along with negative surface mass balance anomalies. Three distinct mass balance states are evident in the reconstruction: (1849-1932) with near zero mass balance, (1932-1992) with ice mass loss dominated by ice dynamical flow, and (1998-2012), when increased retreat and negative surface mass balance anomalies led to mass loss that was twice that of any earlier period. Over the multi-decadal simulation, mass loss was dominated by thinning and acceleration responsible for 70% of the total mass loss induced by prescribed change in terminus position. The remaining 30% of the total ice mass loss resulted directly from prescribed terminus retreat and decreasing surface mass balance. Although the method can not explain the cause of glacier retreat, it enables the reconstruction of ice flow and geometry during 1849-2012. Given annual or seasonal ob-served terminus front positions, this method could be a useful tool for evaluating simulations investigating the effect of calving laws. |
format |
Article in Journal/Newspaper |
author |
Haubner, Konstanze Box, Jason E. Schlegel, Nicole J. Larour, Eric Y. Morlighem, Mathieu Solgaard, Anne M. Kjeldsen, Kristian K. Larsen, Signe H. Rignot, Eric Dupont, Todd K. Kjaer, Kurt H. |
spellingShingle |
Haubner, Konstanze Box, Jason E. Schlegel, Nicole J. Larour, Eric Y. Morlighem, Mathieu Solgaard, Anne M. Kjeldsen, Kristian K. Larsen, Signe H. Rignot, Eric Dupont, Todd K. Kjaer, Kurt H. Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
author_facet |
Haubner, Konstanze Box, Jason E. Schlegel, Nicole J. Larour, Eric Y. Morlighem, Mathieu Solgaard, Anne M. Kjeldsen, Kristian K. Larsen, Signe H. Rignot, Eric Dupont, Todd K. Kjaer, Kurt H. |
author_sort |
Haubner, Konstanze |
title |
Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
title_short |
Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
title_full |
Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
title_fullStr |
Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
title_full_unstemmed |
Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM |
title_sort |
simulating ice thickness and velocity evolution of upernavik isstrom 1849-2012 by forcing prescribed terminus positions in issm |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/1515b0de-299a-498e-91c8-d3dc6a32f189 https://doi.org/10.5194/tc-12-1511-2018 https://backend.orbit.dtu.dk/ws/files/148215725/tc_12_1511_2018.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet Tidewater Upernavik |
genre_facet |
glacier Greenland Ice Sheet Tidewater Upernavik |
op_source |
Haubner , K , Box , J E , Schlegel , N J , Larour , E Y , Morlighem , M , Solgaard , A M , Kjeldsen , K K , Larsen , S H , Rignot , E , Dupont , T K & Kjaer , K H 2018 , ' Simulating ice thickness and velocity evolution of Upernavik Isstrom 1849-2012 by forcing prescribed terminus positions in ISSM ' , Cryosphere , vol. 12 , no. 4 , pp. 1511-1522 . https://doi.org/10.5194/tc-12-1511-2018 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-12-1511-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
4 |
container_start_page |
1511 |
op_container_end_page |
1522 |
_version_ |
1780733944187060224 |