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The Cryosphere (TC)
Other literature type . 2018
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The Cryosphere
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Basal friction of Fleming Glacier, Antarctica – Part 2: Evolution from 2008 to 2015

Authors: Chen Zhao; Rupert Gladstone; Roland C. Warner; Matt A. King; Thomas Zwinger; Mathieu Morlighem;

Basal friction of Fleming Glacier, Antarctica – Part 2: Evolution from 2008 to 2015

Abstract

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 draw-down 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 ∼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.

Country
United States
Subjects by Vocabulary

Microsoft Academic Graph classification: Buoyancy engineering.material Ice shelf Shear stress Geomorphology Sea level geography geography.geographical_feature_category Thinning Glacier Ice-sheet model Shear (geology) engineering Geology

Library of Congress Subject Headings: lcsh:Environmental sciences lcsh:GE1-350 lcsh:QE1-996.5 lcsh:Geology

Keywords

Oceanography, Physical Geography and Environmental Geoscience, Meteorology & Atmospheric Sciences, Life Below Water, Earth-Surface Processes, Water Science and Technology, Geology, Climate Action, Earth Sciences

49 references, page 1 of 5

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Dunse, T., Schuler, T. V., Hagen, J. O., and Reijmer, C. H.: Seasonal speed-up of two outlet glaciers of Austfonna, Svalbard, inferred from continuous GPS measurements, The Cryosphere, 6, 453- 466, https://doi.org/10.5194/tc-6-453-2012, 2012. [OpenAIRE]

Dunse, T., Schellenberger, T., Hagen, J. O., Kääb, A., Schuler, T. V., and Reijmer, C. H.: Glacier-surge mechanisms promoted by a hydro-thermodynamic feedback to summer melt, The Cryosphere, 9, 197-215, https://doi.org/10.5194/tc-9-197-2015, 2015. [OpenAIRE]

Durand, G., Gagliardini, O., Favier, L., Zwinger, T., and le Meur, E.: Impact of bedrock description on modeling ice sheet dynamics, Geophys. Res. Lett., 38, L20501, https://doi.org/10.1029/2011GL048892, 2011.

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Average
Average
gold
Funded byView all
ARC| Special Research Initiatives - Grant ID: SR140300001
Project
  • Funder: Australian Research Council (ARC) (ARC)
  • Project Code: SR140300001
  • Funding stream: Special Research Initiative (Antarctic) ; Special Research Initiatives
,
AKA| Simulating Antarctic marine ice sheet stability and multi-century contributions to sea level rise, EC| CRAG
Project
CRAG
A coupled ice sheet - ocean model for calibrated prediction of the future contribution to sea level change from the Pine Island Glacier, Antarctica
  • Funder: European Commission (EC)
  • Project Code: 299035
  • Funding stream: FP7 | SP3 | PEOPLE
iis
,
NSF| UNAVCO Community and Facility Support: Geodesy Advancing Earth Science Research
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 0735156
  • Funding stream: Directorate for Geosciences | Division of Earth Sciences
iis
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European Marine Science
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