Long-term stability of geoidal geopotential from Topex/Poseidon satellite altimetry 1993-1999

Citation
M. Bursa et al., Long-term stability of geoidal geopotential from Topex/Poseidon satellite altimetry 1993-1999, EARTH MOON, 84(3), 1999, pp. 163-176
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
EARTH MOON AND PLANETS
ISSN journal
0167-9295 → ACNP
Volume
84
Issue
3
Year of publication
1999
Pages
163 - 176
Database
ISI
SICI code
0167-9295(1999)84:3<163:LSOGGF>2.0.ZU;2-Q
Abstract
The TOPEX/POSEIDON (T/P) satellite altimeter data from January 1, 1993 to O ctober 24, 1999 (cycles 11-261) was used for investigating the long-term va riations in the geoidal geopotential W-0 and/or in the geopotential scale f actor R-0 = GM/W-0 (GM is the adopted geocentric gravitational constant). T he mean values determined for the whole period covered are: W-0 = (62 636 8 56.161 +/- 0.002) m(2) s(-2), R-0 = (6 363 672.5448 +/- 0.0002) m. The actu al accuracy is limited by the altimeter calibration error (2-3 cm) and it i s estimated to be about +/- 0.5 m(2) s(-2) (+/- 5 cm). The yearly variation s of the above mean values are at the formal error level. No long-term tren d in W-0, representing the ocean volume change, was found for the seven yea rs period 1993-9 on the basis of T/P altimeter (AVISO) data. No sea surface topography model was used in the solution.