Comparison of measurements from different radio-echo sounding systems and synchronization with the ice core at Dome C, Antarctica

We present a compilation of radio-echo sounding (RES) measurements of five radar systems (AWI, BAS, CRe-SIS, 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 reflect...

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Bibliographic Details
Published in:The Cryosphere
Main Authors: Winter, Anna, Steinhage, Daniel, Arnold, Emily J., Blankenship, Donald D., Cavitte, Marie G. P., Corr, Hugh F. J., Paden, John D., Urbini, Stefano, Young, Duncan A., Eisen, Olaf
Other Authors: #PLACEHOLDER_PARENT_METADATA_VALUE#, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia
Format: Article in Journal/Newspaper
Language:English
Published: 2017
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Online Access:http://hdl.handle.net/2122/11858
https://doi.org/10.5194/tc-11-653-2017
Description
Summary:We present a compilation of radio-echo sounding (RES) measurements of five radar systems (AWI, BAS, CRe-SIS, 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 bed topography, penetration depth and capacity 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 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 bottom-most region. Considering both aspects, which we judge as crucial factors in the search for old ice, the CReSIS and the UTIG systems are the most suitable ones. In addition to the RES data set comparison we calculate a synthetic radar trace from EDC density and conductivity profiles. We identify 10 common IRHs in the measured RES data and the synthetic trace. We then conduct a sensitivity study for which we remove certain peaks from the input conductivity profile. As a result the respective reflections disappear from the modeled radar trace. In this way, we establish a depth conversion of the measured travel times of the IRHs. Furthermore, we use these sensitivity studies to investigate the cause of observed reflections. The identified IRHs are assigned ages from the EDC’s timescale. 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. Published 653-668 5A. Paleoclima e ricerche polari JCR Journal