HR: 1340h
AN: G33C-0062 [Abstracts]
TI: Mascon Solutions From GRACE
AU: * Lemoine, F G
EM: Frank.G.Lemoine@nasa.gov
AF: NASA Goddard Space Flight Center, Code 697, Space Geodesy Laboratory, Greenbelt, MD 20771
United States
AU: Luthcke, S B
G33C-0062
AF: NASA Goddard Space Flight Center, Code 697, Space Geodesy Laboratory, Greenbelt, MD 20771
United States
AU: Rowlands, D D
G33C-0062
AF: NASA Goddard Space Flight Center, Code 697, Space Geodesy Laboratory, Greenbelt, MD 20771
United States
AU: Chinn, D S
G33C-0062
AF: SGT Inc., 7701 Greenbelt Road, Greenbelt, MD 20770
United States
AU: Boy, J
G33C-0062
AF: University of Strasbourg, Ecole et Observatoire des Sciences de la Terre, Institut de Physique du Globe,
Strasbourg, 67084
France
AU: Cox, C M
G33C-0062
AF: Raytheon ITSS Corp., 1616 McCormick Drive, Upper Marlboro, MD 20774
United States
AU: Klosko, S M
G33C-0062
AF: SGT Inc., 7701 Greenbelt Road, Greenbelt, MD 20770
United States
AB:
We have analyzed GRACE Level 1B data from April 2003 through November 2004 using both a spherical harmonic and an approach
based on local solutions using mass concentrations (mascons). In our mascon approach, we explicitly solve for the mass of
water in surface blocks using only the KBRR data collected as the GRACE spacecraft overfly the regions of interest. The
local representation of gravity minimizes errors from other areas due to leakage and mismodelling. We focus on mascon
solutions at submonthly intervals over the Amazon, India, the continental US, and other regions with interesting
hydrological signals. We characterize the effects of errors in the ocean tidal modeling, and in the atmospheric gravity on
the mascon solutions, based on the differences between NCEP and ECMWF. In addition we perform detailed comparisons between
the mascon solutions, and parallel solutions done with spherical harmonics, and we make detailed comparison of the mascon
solutions with hydrological models.
DE: 1214 Geopotential theory and determination (0903)
DE: 1217 Time variable gravity (7223, 7230)
DE: 1222 Ocean monitoring with geodetic techniques (1225, 1641, 3010, 4532, 4556, 4560, 6959)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: Fall Meeting 2005