From AAAS online:
Widespread Persistent Thickening of the East Antarctic Ice Sheet by Freezing from the Base
An International Polar Year aerogeophysical investigation of the high interior of East Antarctica reveals widespread freeze-on that drives significant mass redistribution at the bottom of the ice sheet. While surface accumulation of snow remains the primary mechanism for ice sheet growth, beneath Dome A 24% of the base by area is frozen-on ice. In some places, up to half the ice thickness has been added from below.
These ice packages result from conductive cooling of water ponded near the Gamburtsev Subglacial Mountain ridges and supercooling of water forced up steep valley walls. Persistent freeze-on thickens the ice column, alters basal ice rheology and fabric and upwarps the overlying ice sheet, including the oldest atmospheric climate archive, and drives flow behavior not captured in present models.
- Received for publication 8 November 2010.
- Accepted for publication 18 February 2011.
- Robin E. Bell1,
- Fausto Ferraccioli2,
- Timothy T. Creyts1,
- David Braaten3,
- Hugh Corr2,
- Indrani Das1,
- Detlef Damaske4,
- Nicholas Frearson1,
- Thomas Jordan2,
- Kathryn Rose2,
- Michael Studinger5, and
- Michael Wolovick1
+ Author Affiliations
1Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.
2British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK.
3Center for the Remote Sensing of Ice Sheets, Kansas University, Lawrence, KS, USA.
4Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany.
5Goddard Earth Science and Technology Center, University of Maryland Baltimore County, MD, and NASA Goddard Space Flight Center, MD, USA.