HR: 1340h
AN: C23A-0941    [Abstracts]
TI: Ice Penetrating Radar Surveys in the Fourcade Glacier of King George Island, Antarctica
AU: * Kim, K Y
EM: kykim@kangwon.ac.kr
AF: Kangwon National University, 192-1 Hyoja-2-dong, Chunchon, 200-701, Korea, Republic of
AU: Lee, J H
EM: jhlee@kopri.re.kr
AF: Korea Polar Research Institute, Songdo Techno Park, 7-50, Songdo-dong, Yeonsu-gu, Inchon, 406-840, Korea, Republic of
AU: Hong, M H
EM: hmh2525@kangwon.ac.kr
AF: Korea Polar Research Institute, Songdo Techno Park, 7-50, Songdo-dong, Yeonsu-gu, Inchon, 406-840, Korea, Republic of
AU: Hong, J K
EM: jkhong@kopri.re.kr
AF: Korea Polar Research Institute, Songdo Techno Park, 7-50, Songdo-dong, Yeonsu-gu, Inchon, 406-840, Korea, Republic of
AU: Goo, K M
EM: kmgoo@kopri.re.kr
AF: Korea Polar Research Institute, Songdo Techno Park, 7-50, Songdo-dong, Yeonsu-gu, Inchon, 406-840, Korea, Republic of
AU: Shon, H W
EM: hshon@mail.paichai.ac.kr
AF: Pai Chai University, 14 Yeon-Ja 1 Gil, Seo-gu, Daejon, 302-735, Korea, Republic of
AB: To determine subglacial topography and internal features of the Fourcade Glacier of King George Island in Antarctica, helicopter-borne and ground-towed GPR data were recorded along four profiles in November 2006. Signature deconvolution, F-K migration velocity analysis, and finite difference depth migration applied to the mixed-phase, single-channel, ground-towed data, were effective in increasing vertical resolution, obtaining the velocity function, and yielding clear depth images, respectively. The radar sections show rugged subglacial topography, englacial gliding surfaces, and localized scattering noise. The maximum depth to the basement is over 79 m in the subglacial valley adjacent to the southeastern slope of the divide ridge between Fourcade and Moczydlowski Glaciers. In the ground-towed profile, we interpret a complicated conduit above possible basal water and other isolated cavities, which are a few meters wide. Near the terminus, the GPR profiles image gliding surfaces, fractures, and faults, which will contribute to the tidewater calving mechanism forming icebergs in Potter Cove. The ice cliff at the terminus of the outlet glacier has retreated up to 100 m during the last two years.
DE: 0720 Glaciers
DE: 0738 Ice (1863)
DE: 0776 Glaciology (1621, 1827, 1863)
DE: 0794 Instruments and techniques
DE: 0910 Data processing
SC: Cryosphere [C]
MN: 2007 Fall Meeting