Geodetic and geophysical use of geocenter time series
Abstract
The motion of the Earth's center of mass (geocenter) with respect to a terrestrial reference frame attached to the crust is usually described by time series of the coordinates of the origin of the individual data sets derived from SLR, DORIS or GPS. On the other hand, global atmospheric and oceanic dynamics can be used to predict such motions. We compare the observed time-series of geocenter components with the ones computed from model outputs for oceanic mass variations (ECCO assimilation) as well as for atmosphere (ECMWF and NCEP), in order to study the correlations with mass transfer in these surface fluid reservoirs. The intercomparison of space geodetic time series and their comparison with geophysical predictions at the seasonal, interannual and long term frequencies are used to evaluate the space geodetic reference frame results in terms of accuracy and stability. The ability to detect motions induced by the global geophysical fluids is evaluated.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35.1373F