Document Type

Conference Proceeding

Publication Title

Annals of Glaciology

Rights and Access Note

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Publication Date

2005

First Page

71

Last Page

76

Volume Number

41

Abstract/ Summary

New ice-velocity measurements are obtained for the main trunk of Byrd Glacier, East Antarctica, using recently acquired Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery. The velocities are derived from the application of a cross-correlation technique to sequential images acquired in 2000 and 2001. Images were co-registered and ortho-rectified with the aid of a digital elevation model (DEM) generated from ASTER stereo imagery. This paper outlines the process of DEM generation, image co-registration and correction, and the application of the cross-correlation technique to obtain ice velocities. Comparison of the new velocity map with earlier measurements of velocity from 1978 indicates that the glacier has undergone a substantial deceleration between observations. Portions of the glacier flowing at speeds of similar to 850 m a(-1) in 1978/79 were flowing at similar to 650 m a(-1) in 2000/01. The cause of this change in ice dynamics is not known, but the observation shows that East Antarctic outlet glaciers can undergo substantial changes on relatively short timescales.

Citation/Publisher Attribution

Stearns, L, and Hamilton, G, 2005, A New Velocity Map for Byrd Glacier, East Antarctica, from Sequential Aster Satellite Imagery: Annals of Glaciology, Vol 41 2005, v. 41, p. 71-76. Available on publisher's site at: http://www.ingentaconnect.com/content/igsoc/agl/2005/00000041/00000001/art00012

Publisher Statement

© Copyright 2005 by the International Glaciological Society

DOI

10.3189/172756405781813393

Version

publisher's version of the published document

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In Copyright - Educational Use Permitted.