Bedrock Topography of the Greenland Ice Sheet in the Dye 3 Area

  1. C.C. Langway Jr.,
  2. H. Oeschger and
  3. W. Dansgaard
  1. S. Overgaard1 and
  2. N. S. Gundestrup2

Published Online: 18 MAR 2013

DOI: 10.1029/GM033p0049

Greenland Ice Core: Geophysics, Geochemistry, and the Environment

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

Author Information

  1. 1

    Electromagnetics Institute, Technical University, Denmark

  2. 2

    Geophysical Isotope Laboratory, University of Copenhagen, Denmark

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1985

ISBN Information

Print ISBN: 9780875900575

Online ISBN: 9781118664155

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Keywords:

  • Ice sheets—Greenland—Addresses, essays, lectures;
  • Greenland Ice Sheet Program

Summary

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.