HR: 15:10h
AN: G23A-07    [Abstracts]
TI: Ice Mass Trend Observations from GRACE and ICESat
AU: * Luthcke, S B
EM: Scott.B.Luthcke@nasa.gov
AF: NASA GSFC, Space Geodesy Laboratory, Code 697, Greenbelt, MD 20770 United States
AU: Rowlands, D D
EM: David.D.Rowlands@nasa.gov
AF: NASA GSFC, Space Geodesy Laboratory, Code 697, Greenbelt, MD 20770 United States
AU: Klosko, S M
EM: sklosko@sgt-inc.com
AF: SGT Inc., 7701 Greenbelt Road, Suite 400, Greenbelt, MD 20771 United States
AU: Lemoine, F G
EM: Frank.G.Lemoine@nasa.gov
AF: NASA GSFC, Space Geodesy Laboratory, Code 697, Greenbelt, MD 20770 United States
AU: Williams, T A
EM: twilliams03@carolina.rr.com
AF: SGT Inc., 7701 Greenbelt Road, Suite 400, Greenbelt, MD 20771 United States
AB: On multi-decadal time scales or longer, the most important process affecting sea level are those associated with the mass balance over the Earth's ice sheets. The vulnerability of the cryosphere to climate change along with the difficulty in acquiring uniform in situ observations in these inhospitable regions, makes the problem of understanding ice sheet mass trends a focus within NASA's earth observing program. Towards this objective NASA has on orbit both the Ice Cloud and land Elevation Satellite (ICESat) and the Gravity Recovery and Climate Experiment (GRACE) mission. In combination, these missions provide unique observations to monitor ice sheet topographic change and relate these changes to their underlying mass flux. In order to improve upon the ice trend obtained from these two missions, we have employed unique data analysis approaches to further refine both the ice sheet elevation and mass change observations. Greenland and Antarctica ice sheet mass trend observations derived from our refined ICESat solutions are presented and compared to GRACE mass flux solutions derived from both regional mass anomalies as well as global spherical harmonic solutions estimated from KBRR data alone. ICESat and GRACE data processing refinement techniques, their contribution to more accurate signal recovery, and a preliminary comparison of dh/dt and dm/dt trends are presented.
DE: 0726 Ice sheets
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1225 Global change from geodesy (1222, 1622, 1630, 1641, 1645, 4556)
DE: 1294 Instruments and techniques
SC: Geodesy [G]
MN: Fall Meeting 2005