HR: 1340h
AN: G33B-0047    [Abstracts]
TI: Intercomparison of GRACE and SLR Gravity Field Results at Annual and Semiannual Periods
AU: * Cox, C M
EM: ccox@bowie.gsfc.nasa.gov
AF: Raytheon Information Solutions and NASA/GSFC, Space Geodesy Laboratory, NASA GSFC, Code 697, Greenbelt, MD 20771 United States
AU: Lemoine, F G
EM: flemoine@bowie.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Laboratory, NASA GSFC, Greenbelt, MD 20771 United States
AU: Luthcke, S B
EM: sluthcke@bowie.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Laboratory, NASA GSFC, Greenbelt, MD 20771 United States
AU: Rowlands, D D
EM: drowland@bowie.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Laboratory, NASA GSFC, Greenbelt, MD 20771 United States
AU: Chao, B F
EM: chao@bowie.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Laboratory, NASA GSFC, Greenbelt, MD 20771 United States
AU: Klosko, S M
EM: Steven_M_Klosko@raytheon.com
AF: SGT Inc. and NASA GSFC, Space Geodesy Laboratory, NASA GSFC, Code 697, Greenbelt, MD 20771 United States
AB: Temporal variations of the Earth's gravity field have been observed by studying the perturbations of orbiting satellites using Satellite Laser Ranging (SLR) for over twenty years. More recently the Gravity Recovery And Climate Experiment (GRACE) mission is opening a window on details of global gravity variation and mass budget and precision. Nonetheless, the spherical harmonic solutions show some problems at the longest wavelengths. While the long wavelengths were never intended to be as accurately determined as the rest of the gravity field, simulations have shown that they should still be accurately recovered. Newer processing of the GRACE data, as well as alternate methods are improving the performance in the longer wavelengths. Recent results from NASA GSFC, the GRACE mission, and SLR and DORIS (Doppler Orbitography and Radio Positioning Integrated by Satellite) derived time-variable gravity data series will be presented. This set of comparisons is focused on the annual and inter-annual signals up to spherical harmonic degree 6 (wavelengths of ~3300 km), as well as a look at the differences between the mean signals. Geographically, similar results are seen through a typical year in terms of equivalent water mass height over the Amazon, the monsoons in Southeast Asia, and Africa, Europe, and Western Asia.
DE: 1200 GEODESY AND GRAVITY
DE: 1217 Time variable gravity (7223, 7230)
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: Fall Meeting 2005