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Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty

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

Basal friction of Fleming Glacier, Antarctica – Part 1: Sensitivity of inversion to temperature and bedrock uncertainty

Abstract

Abstract. Many glaciers in the Antarctic Peninsula are now rapidly losing mass. Understanding of the dynamics of these fast-flowing glaciers, and their potential future behaviour, can be improved through ice sheet modelling studies. Inverse methods are commonly used in ice sheet models to infer the spatial distribution of a basal friction coefficient, which has a large effect on the basal velocity and ice deformation. Here we use the full-Stokes Elmer/Ice model to simulate the Wordie Ice Shelf–Fleming Glacier system in the southern Antarctic Peninsula. With an inverse method, we infer the pattern of the basal friction coefficient from surface velocities observed in 2008. We propose a multi-cycle spin-up scheme to reduce the influence of the assumed initial englacial temperature field on the final inversion. This is particularly important for glaciers like the Fleming Glacier, which have areas of strongly temperature-dependent deformational flow in the fast-flowing regions. Sensitivity tests using various bed elevation datasets, ice front positions and boundary conditions demonstrate the importance of high-accuracy ice thickness/bed geometry data and precise location of the ice front boundary.

Country
United States
Subjects by Vocabulary

Microsoft Academic Graph classification: Spatial distribution Boundary value problem Inverse method Geomorphology geography geography.geographical_feature_category Bedrock Glacier Inversion (meteorology) Ice thickness Ice sheet Geology

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

Keywords

Oceanography, Meteorology & Atmospheric Sciences, Physical geography and environmental geoscience, Earth-Surface Processes, Water Science and Technology, Geology, Climate Action, Earth Sciences

49 references, page 1 of 5

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Cook, A. J., Vaughan, D., Luckman, A., and Murray, T.: A new Antarctic Peninsula glacier basin inventory and observed area changes since the 1940s, Antarct. Sci., 26, 614-624, 2014. [OpenAIRE]

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Förste, C., Schmidt, R., Stubenvoll, R., Flechtner, F., Meyer, U., König, R., Neumayer, H., Biancale, R., Lemoine, J.-M., Bruinsma, S., Loyer, S., Barthelmes, F., and Esselborn, S.: The GeoForschungsZentrum Potsdam/Groupe de Recherche de Gèodésie Spatiale satellite-only and combined gravity field models: EIGEN-GL04S1 and EIGEN-GL04C, J. Geodesy, 82, 331- 346, 2008.

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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).
    16
    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.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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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!
16
Top 10%
Average
Top 10%
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
,
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
,
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
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European Marine Science
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