HR: 0800h
AN: U21C-0625    [Abstracts]
TI: GRACE Solutions for the Gravity Field over Central Europe Compared to the Surface Field as Recorded by the GGP Network.
AU: * Crossley, D J
EM: crossley@eas.slu.edu
AF: Dept. Earth and Atmospheric Sciences, Saint Louis University, 3642 Lindell Blvd., St. Louis, MO 63108, United States
AU: de Linage, C
EM: Caroline.De-Linage@eost.u-strasbg.fr
AF: EOST/IPG Strasbourg (UMR CNRS/ULP 7516), 5 rue Rene Descartes, Strasbourg, 67084, France
AU: Hinderer, J
EM: jhinderer@eost.u-strasbg.fr
AF: EOST/IPG Strasbourg (UMR CNRS/ULP 7516), 5 rue Rene Descartes, Strasbourg, 67084, France
AU: Boy, J
EM: jpboy@eost.u-strasbg.fr
AF: EOST/IPG Strasbourg (UMR CNRS/ULP 7516), 5 rue Rene Descartes, Strasbourg, 67084, France
AB: As the number of different solutions from the GRACE satellite gravity project evolves, we can make more meaningful comparisons between the satellite-derived field and the surface field as recorded by superconducting gravimeters. On the GRACE side, we use CSR Level 2 products RL01 and the recent RL04 solutions, GFZ RL04 solutions, and the CNES/GRGS 10-day solutions, all for the time periods these are available. On the GGP side, we take advantage of the 10 years of SG data since July 1997 from 6-8 ground stations in Europe, allowing for the change in the network configuration as stations begin and end recording. Only data since 2002 can be compared directly to GRACE. Our primary measure of variability is the first principal component of the EOF analysis of all the fields. Unsurprisingly, the seasonal components for all the comparisons are similar in phase, but different in amplitude, to the predictions from a global hydrology model (GLDAS), provided allowance is made for the location of the SG stations above or below the soil moisture horizon that controls the gravity signature. We use detailed modeling at the Strasbourg station, as well as published results for Moxa and Membach, to confirm the gravity effect of hydrology. Good agreement is found between the GGP and the CNES/GRGS 10-day solutions, indicating the higher temporal resolution of this satellite solution is valid for our limited geographical area. We also synthesize the gravity field over the sub-group of GGP stations in N.E. Asia to see how the GRACE variability compares to that for the European array and to assess future ground validation using new GGP stations in that part of the world.
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1217 Time variable gravity (7223, 7230)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1295 Integrations of techniques
SC: Union [U]
MN: 2007 Fall Meeting