Global Ocean Tides from GRACE Satellite Accelerations
Abstract
Models such as FES2004 are routinely used to remove the effects of global ocean tides from GRACE data, but errors in ocean tide models alias into monthly GRACE solutions. Fortunately, GRACE inter-satellite ranging data can be used to solve for these tides directly. Nine years of GRACE inter-satellite acceleration data are inverted using a mascon approach to solve for residual amplitudes and phases of major solar and lunar tides relative to FES2004. Uncertainty estimates are derived from tidal solutions over land, and by subtracting two independent solutions that each use 4.5 years of data. Solutions are also obtained for non-sinusoidal oceanic signals with power at short (sub-monthly) periods.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFMOS23A1618K
- Keywords:
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- 1217 GEODESY AND GRAVITY / Time variable gravity;
- 1222 GEODESY AND GRAVITY / Ocean monitoring with geodetic techniques;
- 1240 GEODESY AND GRAVITY / Satellite geodesy: results;
- 4283 OCEANOGRAPHY: GENERAL / Water masses