This is a commentary on DOI:10.1029/2005GL025561
New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island Glacier
Article first published online: 3 MAY 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 9, May 2006
How to Cite
2006), New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island Glacier, Geophys. Res. Lett., 33, L09501, doi:10.1029/2005GL025588., , , , , , , , , and (
- Issue published online: 3 MAY 2006
- Article first published online: 3 MAY 2006
- Manuscript Accepted: 8 MAR 2006
- Manuscript Revised: 13 FEB 2006
- Manuscript Received: 22 DEC 2005
 Predictions about future changes in the Amundsen Sea sector of the West Antarctic ice sheet (WAIS) have been hampered by poorly known subglacial topography. Extensive airborne survey has allowed us to derive improved subglacial topography for the Pine Island Glacier basin. The trunk of this glacier lies in a narrow, 250-km long, 500-m deep sub-glacial trough, suggesting a long-lived and constrained ice stream. Two tributaries lie in similar troughs, others lie in less defined, shallower troughs. The lower basin of the glacier is surrounded by bedrock, which, after deglaciation and isostatic rebound, could rise above sea level. This feature would impede ice-sheet collapse initiated near the grounding line of this glacier, and prevent its progress into the deepest portions of WAIS. The inland-slope of the bed beneath the trunk of the glacier, however, confirms potential instability of the lower basin, containing sufficient ice to raise global sea by ∼24 cm.