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Korea Polar Data Center Scientific observations and results from Antarctica shall
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An englacial image and water pathways of the Fourcade glacier on King George Island, Antarctic Peninsula, inferred from ground-penetrating radar

The distribution of small fractures and water content of the Fourcade glacier on King George Island, Antarctica, was investi- gated in November 2006 and December 2007 by two ground-based (470- and 490-m-long profiles) and one helicopter-borne (470-m-long profile) ground-penetrating radar (GPR) surveys using 50-, 100-, and 500-MHz antennas. Radar images in the pre-migrated GPR sections are characterized by a smooth ice surface and irregular bed topography, numerous diffraction hy- perbolas in the ice and at the glacier bed, strong scattering noise, and near-surface folded layers. Scattering noise above a mound in the center of the profiles is associated with an area of dense fractures extending down from the ice surface that has relatively low reflection strength. Near the northeast ends of the profiles where few englacial fractures occur, scattering noise may result from the presence of warmer ice. A water-filled conduit and an air-filled cavity are interpreted as the source of two distinct hyperbolas in sub-glacial valleys based on the polarity of the reflections. Through migration velocity analysis on 106 hyperbolas, radar velocities were obtained for the 100-MHz ground-based profile. Using the velocities and Paren’s mixture formula, we calculated the water content of the ice to have been in the range of 0.00–0.09. High water content occurs near the glacier margin, in sub-glacial valleys, and in zones of scattering noise.

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Entry ID
DOI
https://dx.doi.org/doi:10.22663/KOPRI-KPDC-00000303
Copyright
Science Keyword
ISO Topic
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Instruments
GPR(ground-penetrating radar)
Personnel
  • Joohan Lee (joohan@kopri.re.kr)
Project
Create/Update Date
2013-02-21 / 2013-02-21
Location
Continent > Antarctica > King George Island > Antarctic Peninsula
Dataset
An englacial image and water pathways of the Fourcade glacier on King George Island, Antarctic Peninsula, inferred from ground-penetrating radar Formation, evolution and neotectonics of Antarctica Lee,Joohan
An englacial image and water pathways of the Fourcade glacier on King George Island, Antarctic Peninsula, inferred from ground-penetrating radar Antarctic Marine Geological Survey Lee,Joohan
Citation
The data(KOPRI-KPDC-00000303) used in this work was provided by the Korea Polar Research Institute.

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