A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet

JL Bamber, RJ Hardy, P Huybrechts, I Joughin

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)

Abstract

Balance velocities for the Greenland ice sheet have been calculated from a new digital-elevation model, accumulation-rates compilation and an existing ice-thickness grid, using a two-dimensional finite-difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic-aperture-radar interferometry for part of northern Greenland and a limited number of global positioning system data. This comparison indicated that the balance-velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance-velocity data could provide a valuable method of constraining a numerical ice-sheet model. The balance velocities were compared with the diagnostic velocity field calculated from several different configurations of a numerical ice-sheet model. The general pattern of flow agrees well. The detail, however, is quite different. For example, the large (>300 km) ice stream in the northeast is not generated by the numerical model and much of the detailed flow pattern is completely lost due to the limited model resolution and limitations in the model physics.
Translated title of the contributionA comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet
Original languageEnglish
Pages (from-to)211 - 216
Number of pages6
JournalAnnals of Glaciology
Volume30 (1)
DOIs
Publication statusPublished - Jan 2000

Bibliographical note

Publisher: International Glaciological Society

Fingerprint Dive into the research topics of 'A comparison of balance velocities, measured velocities and thermomechanically modelled velocities for the Greenland Ice Sheet'. Together they form a unique fingerprint.

Cite this