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Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica

  • F.J. Navarro (a1), J. Otero (a1), Yu.Ya. Macheret (a2), E.V. Vasilenko (a3), J.J. Lapazaran (a1), A.P. Ahlstrøm (a4) and F. Machío (a5)...
Abstract
Abstract

We present the results of several radio-echo sounding surveys carried out on Johnsons and Hurd Glaciers, Livingston Island, Antarctica, between the 1999/2000 and 2004/05 austral summer campaigns, which included both radar profiling and common-midpoint measurements with low (20– 25 MHz)- and high (200 MHz)-frequency radars. The latter have allowed us to estimate the radio-wave velocity in ice and firn and the corresponding water contents in temperate ice, which vary between 0 and 1.6% depending on the zone. Maximum ice thickness is ~200 m, with a mean value of 93.6±2.5 m. Total ice volume is 0.968±0.026 km3, for an area of 10.34±0.03km2. The subglacial relief of Johnsons Glacier is quite smooth, while that of Hurd Glacier shows numerous overdeepenings and peaks. The radar records suggest that Hurd Glacier has a polythermal structure, contrary to the usual assumption that glaciers in Livingston Island are temperate. This is also supported by other dynamical and geomorphological evidence.

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References
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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
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