Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica

F.J. Navarro, J. Otero, Yu Ya Macheret, E.V. Vasilenko, J.J. Lapazaran, A.P. Ahlstrøm, F. Machío

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

24 Citationer (Scopus)

Abstrakt

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 (2025 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 ± 0.03 km 2. 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.

OriginalsprogEngelsk
Sider (fra-til)17-24
Antal sider8
TidsskriftAnnals of Glaciology
Vol/bind50
Udgave nummer51
DOI
StatusUdgivet - 2009

Programområde

  • Programområde 5: Natur og klima

Fingeraftryk

Dyk ned i forskningsemnerne om 'Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica'. Sammen danner de et unikt fingeraftryk.

Citationsformater