Bedrock Topography of the Greenland Ice Sheet in the Dye 3 Area
- C.C. Langway Jr.,
- H. Oeschger and
- W. Dansgaard
Published Online: 18 MAR 2013
Copyright 1985 by the American Geophysical Union.
Greenland Ice Core: Geophysics, Geochemistry, and the Environment
How to Cite
Overgaard, S. and Gundestrup, N. S. (1985) Bedrock Topography of the Greenland Ice Sheet in the Dye 3 Area, in Greenland Ice Core: Geophysics, Geochemistry, and the Environment (eds C.C. Langway, H. Oeschger and W. Dansgaard), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM033p0049
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1985
Print ISBN: 9780875900575
Online ISBN: 9781118664155
- Ice sheets—Greenland—Addresses, essays, lectures;
- Greenland Ice Sheet Program
The bedrock topography of a 1400 square kilometer area around the Dye 3 radar station on the Greenland Ice Sheet is obtained from radio-echo soundings. The subgîaciaî landscape is very mountainous with large changes in bedrock relief. The compiled map of the bedrock shows that the deep ice core from Dye 3 is on the eastern slope of a valley that trends northwest-southeast. In addition there are large undulations upstream of the drill site. Measurements were made by both an airborne 10 kw sounder, and a 1 kw lightweight surface sounder. Corrections for navigational errors were made to the airborne measurements when data from both were combined to produce topographical maps. The two-way dielectric absorption in the ice is calculated using a measured temperature profile in the borehole. It indicates the reflection coefficient at the ice-bedrock interface to be very low. A list of satellite-obtained locations of map control points is included.