HR: 15:10h
AN: C53A-07    [Abstracts]
TI: Subglacial water distribution and transfer in Antarctica mapped with ICESat and image differencing
AU: * Fricker, H A
EM: hafricker@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, La Jolla, CA 92093-0225, United States
AU: Scambos, T
EM: teds@icehouse.colorado.edu
AF: National Snow and Ice Data Center, CIRES Campus Box 449; 1540 30th St., University of Colorado, Boulder, CO 80309, United States
AU: Bell, R
EM: robinb@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory of Columbia University, 61 Rt. 9W, Palisades, NY 10964, United States
AU: Bindschadler, R
EM: Robert.A.Bindschadler@nasa.gov
AF: NASA Goddard Space Flight Center, Code 614, Greenbelt, MD 20771, United States
AU: Smith, B
EM: ben@ess.washington.edu
AF: Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195- 1310, United States
AB: We have used repeat-track satellite laser altimeter (ICESat) data acquired between 2003-2007 over several drainage basins in Antarctica to map the locations of pooled subglacial water and monitor the transfer of water between reservoirs. The altimeter results are supported by satellite image differencing using contemporaneous MODIS imagery. We have made estimates of the temporal variation in water volumes in the lakes using two independent methods and examined linkages between lakes within the same hydrologic regime. We also consider the source of the water and how it affects local ice stream dynamics. Mapping subglacial water distribution and movement in Antarctica is important for improving models of the Antarctic ice sheet system. Monitoring subglacial outflows from the ice sheet margins is also important for quantifying freshwater flux to the ocean and understanding ice-ocean interactions.
DE: 0726 Ice sheets
DE: 0746 Lakes (9345)
DE: 0776 Glaciology (1621, 1827, 1863)
DE: 0794 Instruments and techniques
SC: Cryosphere [C]
MN: 2007 Fall Meeting