HR: 11:35h
AN: C31D-06    [PDF]
TI: Surface Topography and Ice-Sheet Dynamics Over the Vostok Subglacial Lake, Antarctica
AU: * Wang, W
EM: weili@icesat2.gsfc.nasa.gov
AF: Raytheon,ITSS, NASA/Goddard Space Flight Center, Code 971, Greenbelt, MD 20771 United States
AU: Pattyn, F
EM: fpattyn@vub.ac.be
AF: Department of Geography, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussel Belgium
AU: Zwally, J
EM: zwally@icesat2.gsfc.nasa.gov
AF: Ocean and Ice Branch, NASA/Goddard Space Flight Center, Code 971, Greenbelt, MD 20771 United States
AU: Beckley, M
EM: matt@icesat2.gsfc.nasa.gov
AF: Raytheon,ITSS, NASA/Goddard Space Flight Center, Code 971, Greenbelt, MD 20771 United States
AB: Surface topography in the region of the Vostok subglacial lake, Antarctica, from the previous analysis of radio-echo sounding and satellite radar-altimeter data indicated a trough (2-8 m) along the western margins and a rise (5-7 m) along the eastern margins. The elevation data obtained from Ice, Cloud, and Land Elevation Satellite (ICESat) show the troughs and rises in more detail, such as a deeper trough (18 m) in the western margin. These troughs and rises have been assumed to be caused by ice dynamics as the ice flows from grounded to floating and to re-grounded status, and associated buoyancy effect. We use a newly developed time-dependent 3-D thermo-mechanical higher-order numerical model to simulate the ice flow across Vostok subglacial lake. By comparing the surface topography generated from the model with the ICESat measurements, the ice-sheet behavior is investigated to explain in more detail the cause of the troughs and rises.
DE: 0933 Remote sensing
DE: 1827 Glaciology (1863)
DE: 9310 Antarctica
DE: 9699 General or miscellaneous
SC: Cryosphere [C]
MN: 2003 Fall Meeting