Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
doi:10.5194/tc-2016-147
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
14 Jun 2016
Review status
A revision of this discussion paper was accepted for the journal The Cryosphere (TC).
Radio-echo sounding measurements and ice-core synchronization at Dome C, Antarctica
Anna Winter1, Daniel Steinhage1, Emily J. Arnold2, Donald D. Blankenship3, Marie G. P. Cavitte3, Hugh F. J. Corr4, John D. Paden2, Stefano Urbini5, Duncan A. Young3, and Olaf Eisen1,6 1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
2Center for Remote Sensing of Ice Sheets, Lawrence, KS, USA
3University of Texas Institute for Geophysics, Austin, TX, USA
4British Antarctic Survey, Cambridge, UK
5Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
6Fachbereich Geowissenschaften, Universität Bremen, Bremen, Germany
Abstract. We present a compilation of radio-echo sounding (RES) measurements of five radar systems (AWI, BAS, CReSIS, INGV and UTIG) around the EPICA Dome C (EDC) drill site, East Antarctica. The aim of our study is to investigate the differences of the various systems in their resolution of internal reflection horizons (IRHs) and bedrock topography, penetration depth, and quality of imaging the basal layer. We address the questions of the compatibility of existing radar data for common interpretation, and the suitability of the individual systems for Oldest Ice reconnaissance surveys. We find that the most distinct IRHs and IRH patterns can be identified and transferred between most data sets. Considerable differences between the RES systems exist in range resolution and depiction of the basal layer. Considering both aspects, which we judge as crucial factors in the search for old ice, the CReSIS and the UTIG systems are the most valuable ones. In addition to the RES data set comparison we calculate a synthetic radar trace from EDC density and conductivity profiles. We identify ten common IRHs in the measured RES data and the synthetic trace. The reflection-causing conductivity sections are determined by sensitivity studies with the synthetic trace. In this way, we accomplish an accurate two-way travel time to depth conversion for the reflectors, without having to use a precise velocity-depth function that would accumulate depth uncertainties with increasing depth. The identified IRHs are assigned with the AICC2012 time scale age. Due to the isochronous character of these conductivity-caused IRHs, they are a means to extend the Dome C age structure by tracing the IRHs along the RES profiles.

Citation: Winter, A., Steinhage, D., Arnold, E. J., Blankenship, D. D., Cavitte, M. G. P., Corr, H. F. J., Paden, J. D., Urbini, S., Young, D. A., and Eisen, O.: Radio-echo sounding measurements and ice-core synchronization at Dome C, Antarctica, The Cryosphere Discuss., doi:10.5194/tc-2016-147, in review, 2016.
Anna Winter et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Reviewer comments to Winter et al. 2016 (Tom Jordan, University of Bristol)', Thomas Jordan, 11 Jul 2016 Printer-friendly Version Supplement 
AC1: 'Author comment to RC1', Anna Winter, 21 Sep 2016 Printer-friendly Version Supplement 
 
RC2: 'Referee comments', Anonymous Referee #2, 27 Jul 2016 Printer-friendly Version 
AC2: 'Author comment to RC2', Anna Winter, 21 Sep 2016 Printer-friendly Version Supplement 
Anna Winter et al.
Anna Winter et al.

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