A high-resolution bedrock map for the Antarctic Peninsula 1Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, 8093 Zurich, Switzerland
18 Jul 2014
2Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland
3German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany
*Invited contribution by M. Huss, recipient of the EGU Arne Richter Award for Outstanding Young Scientists 2014.
Received: 23 January 2014 – Published in The Cryosphere Discuss.: 17 February 2014 Abstract. Assessing and projecting the dynamic response of glaciers on the Antarctic
Peninsula to changed atmospheric and oceanic forcing requires high-resolution
ice thickness data as an essential geometric constraint for ice flow models.
Here, we derive a complete bedrock data set for the Antarctic Peninsula north
of 70° S on a 100 m grid. We calculate distributed ice thickness
based on surface topography and simple ice dynamic modelling. Our approach is
constrained with all available thickness measurements from Operation
IceBridge and gridded ice flow speeds for the entire study region. The new
data set resolves the rugged subglacial topography in great detail, indicates
deeply incised troughs, and shows that 34% of the ice volume is grounded
below sea level. The Antarctic Peninsula has the potential to raise global
sea level by 69 ± 5 mm. In comparison to Bedmap2, covering all
Antarctica on a 1 km grid, a significantly higher mean ice thickness
(+48%) is found.
Revised: 26 May 2014 – Accepted: 12 June 2014 – Published: 18 July 2014
Citation: Huss, M. and Farinotti, D.: A high-resolution bedrock map for the Antarctic Peninsula, The Cryosphere, 8, 1261-1273, doi:10.5194/tc-8-1261-2014, 2014.