Time Variable Gravity from Weekly Solutions from 1993 to 2010 using SLR and DORIS data and Comparisons with GRACE

Details Time Variable Gravity from Weekly Solutions from 1993 to 2010 using SLR and DORIS data and Comparisons with GRACE Time Variable Gravity from Weekly Solutions from 1993 to 2010 using SLR and DORIS data and Comparisons with GRACE

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.g51c0684c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #G51C-0684

Physics

[1217] Geodesy And Gravity / Time Variable Gravity, [1240] Geodesy And Gravity / Satellite Geodesy: Results, [1294] Geodesy And Gravity / Instruments And Techniques, [1694] Global Change / Instruments And Techniques

Scientific paper

GRACE has been routinely monitoring the time-variable gravity field of the Earth since 2003 with either periodic solutions expressed as spherical harmonics or mascons. GRACE can resolve time-variable gravity to between degree 40 and 60, however the time series may be interrupted prior to the launch of a GRACE-2 spacecraft. A suite of satellites tracked by SLR, DORIS and also GPS has been in orbit for many years, and with these satellites it is possible to construct a time series of low degree spherical harmonics over several decades. We have recently reprocessed SLR and DORIS data from 1993 to 2010 using ITRF2008 and have developed weekly solutions based on SLR data to Lageos1, Lageos2, Starlette, Stella, Ajisai, Larets, TOPEX/Poseidon, Envisat, the SPOT satellites, and Jason-2. The new C20 solutions compare favorably to independent SLR solutions, however the annual amplitude in the SLR solutions is greater than in the annual amplitude of the C20 recoveries from GRACE-derived solutions. For non-zonal low degree coefficients, the GRACE and SLR time series seem in reasonable agreement over the time period where the data are in common. We summarize the current status of the processing, and the quality of the solutions that have been obtained thus far, and provide a perspective on future work that remains to be done.

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