HR: 09:45h
AN: C21B-08 INVITED     [Abstracts]
TI: High-resolution Antarctic topography from the ICESat mission near $86\deg$S
AU: * Smith, B E
EM: ben@ess.washington.edu
AF: Benjamin E Smith, 310 Condon Hall Box 351310, Seattle, WA 98195 United States
AB: At the southern limit of ICESat's coverage, the satellite ground-tracks converge. Between $86^o$S and $85^o$S the density of topographic data allows the generation of topographic maps with a resolution of 300-500 meters. At this resolution, fine-scale features of mountain and outlet glaciers as well as aeolean and depositional ice-sheet surface features become visible, in addition to the large-scale ice sheet morphology. In the Transantarctic mountains, dramatic flow-striping is revealed on the Reedy, Scott and Amundsen glaciers. Through the Horilick mountains a unique regime of glacier-flow appears that is mid-way between ice-sheet flow and valley glacier flow. On the East Antarctic plateau, our data reveal the height distribution and orientation of megadune fields. In the relatively featureless parts of the ice sheet where no mountains or nunataks are present, these data also allow the extraction of two-dimensional Fourier spectra of the ice-sheet surface. Analysis of these spectra demonstrates variations in the topographic texture of the ice-sheet that reflect variations in ice- thickness and flow conditions.
DE: 1827 Glaciology (1863)
DE: 1243 Space geodetic surveys
DE: 0933 Remote sensing
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting