New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island Glacier

Details New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island Glacier New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island Glacier

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3309501v&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 9, CiteID L09501

Other

20

Cryosphere: Ice Sheets, Cryosphere: Glaciology (1621, 1827, 1863), Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Global Change: Sea Level Change (1222, 1225, 4556)

Scientific paper

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.

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