Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015
The Wordie Ice Shelf-Fleming Glacier system in the southern Antarctic Peninsula has experienced a long-term retreat and disintegration of its ice shelf in the past 50 years. Increases in the glacier velocity and dynamic thinning have been observed over the past two decades, especially after 2008 whe...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://research.ulapland.fi/fi/publications/386ada45-278e-4f3f-8bed-ecd1ca850205 https://doi.org/10.5194/tc-12-2653-2018 |
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ftulaplandcdispu:oai:lacris.ulapland.fi:publications/386ada45-278e-4f3f-8bed-ecd1ca850205 2024-01-28T09:58:56+01:00 Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 Zhao, Chen Gladstone, Rupert M.M. Warner, Roland C. King, Matt A. Zwinger, Thomas Morlighem, Mathieu 2018-08-15 https://research.ulapland.fi/fi/publications/386ada45-278e-4f3f-8bed-ecd1ca850205 https://doi.org/10.5194/tc-12-2653-2018 eng eng https://research.ulapland.fi/fi/publications/386ada45-278e-4f3f-8bed-ecd1ca850205 info:eu-repo/semantics/openAccess Zhao , C , Gladstone , R M M , Warner , R C , King , M A , Zwinger , T & Morlighem , M 2018 , ' Basal friction of Fleming Glacier, Antarctica - Part 2 : Evolution from 2008 to 2015 ' , Cryosphere , vol. 12 , no. 8 , pp. 2653-2666 . https://doi.org/10.5194/tc-12-2653-2018 WORDIE ICE SHELF GROUNDING LINES WEST ANTARCTICA PENINSULA SURFACE RETREAT SHEET SVALBARD DRIVEN MODEL /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences article 2018 ftulaplandcdispu https://doi.org/10.5194/tc-12-2653-2018 2024-01-04T00:03:21Z The Wordie Ice Shelf-Fleming Glacier system in the southern Antarctic Peninsula has experienced a long-term retreat and disintegration of its ice shelf in the past 50 years. Increases in the glacier velocity and dynamic thinning have been observed over the past two decades, especially after 2008 when only a small ice shelf remained at the Fleming Glacier front. It is important to know whether the substantial further speed-up and greater surface drawdown of the glacier since 2008 is a direct response to ocean forcing, or driven by feedbacks within the grounded marine-based glacier system, or both. Recent observational studies have suggested the 2008-2015 velocity change was due to the ungrounding of the Fleming Glacier front. To explore the mechanisms underlying the recent changes, we use a full-Stokes ice sheet model to simulate the basal shear stress distribution of the Fleming system in 2008 and 2015. This study is part of the first high resolution modelling campaign of this system. Comparison of inversions for basal shear stresses for 2008 and 2015 suggests the migration of the grounding line similar to 9 km upstream by 2015 from the 2008 ice front/grounding line positions, which virtually coincided with the 1996 grounding line position. This migration is consistent with the change in floating area deduced from the calculated height above buoyancy in 2015. The retrograde submarine bed underneath the lowest part of the Fleming Glacier may have promoted retreat of the grounding line. Grounding line retreat may also be enhanced by a feedback mechanism upstream of the grounding line by which increased basal lubrication due to increasing frictional heating enhances sliding and thinning. Improved knowledge of bed topography near the grounding line and further transient simulations with oceanic forcing are required to accurately predict the future movement of the Fleming Glacier system grounding line and better understand its ice dynamics and future contribution to sea level. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica glacier Ice Sheet Ice Shelf Svalbard West Antarctica Wordie Ice Shelf LaCRIS - University of Lapland Current Research System Antarctic Antarctic Peninsula Fleming Glacier ENVELOPE(-66.183,-66.183,-69.467,-69.467) Svalbard West Antarctica Wordie ENVELOPE(-67.500,-67.500,-69.167,-69.167) Wordie Ice Shelf ENVELOPE(-67.750,-67.750,-69.250,-69.250) The Cryosphere 12 8 2653 2666 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
WORDIE ICE SHELF GROUNDING LINES WEST ANTARCTICA PENINSULA SURFACE RETREAT SHEET SVALBARD DRIVEN MODEL /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
spellingShingle |
WORDIE ICE SHELF GROUNDING LINES WEST ANTARCTICA PENINSULA SURFACE RETREAT SHEET SVALBARD DRIVEN MODEL /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences Zhao, Chen Gladstone, Rupert M.M. Warner, Roland C. King, Matt A. Zwinger, Thomas Morlighem, Mathieu Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
topic_facet |
WORDIE ICE SHELF GROUNDING LINES WEST ANTARCTICA PENINSULA SURFACE RETREAT SHEET SVALBARD DRIVEN MODEL /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
description |
The Wordie Ice Shelf-Fleming Glacier system in the southern Antarctic Peninsula has experienced a long-term retreat and disintegration of its ice shelf in the past 50 years. Increases in the glacier velocity and dynamic thinning have been observed over the past two decades, especially after 2008 when only a small ice shelf remained at the Fleming Glacier front. It is important to know whether the substantial further speed-up and greater surface drawdown of the glacier since 2008 is a direct response to ocean forcing, or driven by feedbacks within the grounded marine-based glacier system, or both. Recent observational studies have suggested the 2008-2015 velocity change was due to the ungrounding of the Fleming Glacier front. To explore the mechanisms underlying the recent changes, we use a full-Stokes ice sheet model to simulate the basal shear stress distribution of the Fleming system in 2008 and 2015. This study is part of the first high resolution modelling campaign of this system. Comparison of inversions for basal shear stresses for 2008 and 2015 suggests the migration of the grounding line similar to 9 km upstream by 2015 from the 2008 ice front/grounding line positions, which virtually coincided with the 1996 grounding line position. This migration is consistent with the change in floating area deduced from the calculated height above buoyancy in 2015. The retrograde submarine bed underneath the lowest part of the Fleming Glacier may have promoted retreat of the grounding line. Grounding line retreat may also be enhanced by a feedback mechanism upstream of the grounding line by which increased basal lubrication due to increasing frictional heating enhances sliding and thinning. Improved knowledge of bed topography near the grounding line and further transient simulations with oceanic forcing are required to accurately predict the future movement of the Fleming Glacier system grounding line and better understand its ice dynamics and future contribution to sea level. |
format |
Article in Journal/Newspaper |
author |
Zhao, Chen Gladstone, Rupert M.M. Warner, Roland C. King, Matt A. Zwinger, Thomas Morlighem, Mathieu |
author_facet |
Zhao, Chen Gladstone, Rupert M.M. Warner, Roland C. King, Matt A. Zwinger, Thomas Morlighem, Mathieu |
author_sort |
Zhao, Chen |
title |
Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
title_short |
Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
title_full |
Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
title_fullStr |
Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
title_full_unstemmed |
Basal friction of Fleming Glacier, Antarctica - Part 2:Evolution from 2008 to 2015 |
title_sort |
basal friction of fleming glacier, antarctica - part 2:evolution from 2008 to 2015 |
publishDate |
2018 |
url |
https://research.ulapland.fi/fi/publications/386ada45-278e-4f3f-8bed-ecd1ca850205 https://doi.org/10.5194/tc-12-2653-2018 |
long_lat |
ENVELOPE(-66.183,-66.183,-69.467,-69.467) ENVELOPE(-67.500,-67.500,-69.167,-69.167) ENVELOPE(-67.750,-67.750,-69.250,-69.250) |
geographic |
Antarctic Antarctic Peninsula Fleming Glacier Svalbard West Antarctica Wordie Wordie Ice Shelf |
geographic_facet |
Antarctic Antarctic Peninsula Fleming Glacier Svalbard West Antarctica Wordie Wordie Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica glacier Ice Sheet Ice Shelf Svalbard West Antarctica Wordie Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica glacier Ice Sheet Ice Shelf Svalbard West Antarctica Wordie Ice Shelf |
op_source |
Zhao , C , Gladstone , R M M , Warner , R C , King , M A , Zwinger , T & Morlighem , M 2018 , ' Basal friction of Fleming Glacier, Antarctica - Part 2 : Evolution from 2008 to 2015 ' , Cryosphere , vol. 12 , no. 8 , pp. 2653-2666 . https://doi.org/10.5194/tc-12-2653-2018 |
op_relation |
https://research.ulapland.fi/fi/publications/386ada45-278e-4f3f-8bed-ecd1ca850205 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-12-2653-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
8 |
container_start_page |
2653 |
op_container_end_page |
2666 |
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1789331186254872576 |