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127892 - Basal friction of Fleming Glacier, Antarctica Part 1.pdf (6.11 MB)

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

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posted on 2023-05-19, 20:38 authored by Zhao, C, Gladstone, RM, Roland WarnerRoland Warner, Matt KingMatt King, Zwinger, T, Morlighem, M
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 theWordie 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 highaccuracy ice thickness/bed geometry data and precise location of the ice front boundary.

History

Publication title

The Cryosphere

Volume

12

Issue

8

Pagination

2637-2652

ISSN

1994-0416

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

Copernicus GmbH

Place of publication

Germany

Rights statement

Copyright 2018 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the earth sciences

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