HR: 14:55h
AN: G33C-06    [Abstracts]
TI: Recent results from GRACE in Antarctica and Greenland: comparison with Insar mass balance estimates.
AU: * Velicogna, I
EM: isabella.velicogna@gmail.com
AF: Earth System Science, University of California, Irvine, 3202 Croul Hall, Irvine, CA 92697- 3100, United States
AU: * Velicogna, I
EM: isabella.velicogna@gmail.com
AF: Dept of Physics and CIRES University of Colorado, UCB 390, boulder, CO 80309-0390, United States
AU: Wahr, J
EM: wahr@colorado.edu
AF: Dept of Physics and CIRES University of Colorado, UCB 390, boulder, CO 80309-0390, United States
AU: rignot, e
EM: eric.rignot@jpl.nasa.gov
AF: Jet Propulsion Laboratory, Mail Stop 300-319 4800 Oak Grove Drive, Pasadena, CA 91109-8099, United States
AB: Using measurements of time variable gravity from GRACE satellites we determine long term and seasonal mass variations of the Antarctic and Greenland ice sheets for over a five year period starting in Apr 2002.We use monthly GRACE gravity fields to estimate the linear trends in Greenland and Antarctic ice mass. Both ice sheets display a large mass imbalance during the analyzed period. This presentation will examine uncertainties associated with GRACE ice sheet mass balance. Particularly we will focus on the interpretation of Antarctic mass balance by comparing GRACE and InSAR derived estimates. The mass of the Antarctic ice sheet decreases significantly during the observation period. Most of this mass loss is generated by the West Antarctic Ice Sheet. We will compare ice mass balance from GRACE with InSAR derived estimates in Antarctica and with particular attention to the West Antarctic ice sheet. This comparison will provide an independent verification of the quality of the new snow accumulation model adopted for the InSAR derived estimate as well as of the post glacial rebound estimates.
DE: 0758 Remote sensing
DE: 0762 Mass balance (1218, 1223)
DE: 1217 Time variable gravity (7223, 7230)
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1621 Cryospheric change (0776)
SC: Geodesy [G]
MN: 2007 Fall Meeting