Bed topography and lubrication inferred from surface measurements on fast-flowing ice streams

Thorsteinsson, Throstur, Raymond, Charles, Gudmundsson, Hilmar, Bindschadler, Robert, Vornberger, Paul and Joughin, Ian (2003) Bed topography and lubrication inferred from surface measurements on fast-flowing ice streams. Journal of Glaciology, 49 (167). pp. 481-490. ISSN 0022-1430

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Official URL: http://dx.doi.org/10.3189/172756503781830502

Abstract

Observations of surface elevation (s) and horizontal velocity components (u and v) are inverted to infer the topography (b) and lubrication (c) at the bed of an ice stream, based on a linearized perturbation theory of the transmission of flow disturbances through the ice thickness. Synthetic data are used to illustrate non-uniqueness in the inversion, but also demonstrate that effects of b and c can be separated when s, u and v are specified, even with added noise to simulate measurement errors. We have analyzed prominent short-horizontal-scale (∼2 km) features in topography and velocity pattern in a local 64 km by 32 km area of the surface of Ice Stream E,West Antarctica. Our preferred interpretation of bed conditions beneath the most prominent features on the surface identifies a deep trough in the basal topography with low lubrication in the base of the trough.

Item Type: Article
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Becky Skoyles
Date Deposited: 21 Feb 2019 11:46
Last Modified: 21 Feb 2019 11:46
URI: http://nrl.northumbria.ac.uk/id/eprint/38163

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