Naslov
Impact of new Gravity Missions for Satellite Altimetry Application

Autori
Gruber, Th. ; Peters, Th. ; Flury, J. ; Švehla, Dražen

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Skup
XXIII IUGG General Assembly

Mjesto i datum
Sapporo, Japan, 30.06.2003. - 11.07.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
CHAMP; GOCE; GRACE; satellite altimetry

Sažetak
The new gravity field missions CHAMP, GRACE and GOCE promise to provide significantly improved global gravity field models of the Earth. Satellite altimetry, which closely links the geodetic and oceanographic areas of research, immediately benefits from improved gravity field information in two ways. Apart from possible improvements in the radial accuracy of altimeter satellite orbits by using better gravity field information, the oceanic geoid and its variations is the quantity of main interest, because it enters into the determination of dynamic ocean topography and into bottom pressure variations. The paper investigates both aspects based on the most recent CHAMP (and if available GRACE) gravity field solutions. (1) Orbits for altimeter satellites based on the new gravity field models are analysed in order to identify the impact of the new gravity field models on their radial accuracy. (2) The ocean geoid, derived from these models is analysed in the spatial and spectral domains in order to identify its impact on newly computed sea surface topography solutions. For this purpose several sea surface topography solutions are computed by subtracting the oceanic geoid from altimetry derived mean sea surfaces and subsequent filtering. Comparisons to oceanographically derived sea surface topography solutions are used to assess the quality of the new gravity field solutions over the oceans.

Izvorni jezik
Engleski

Znanstvena područja
Geodezija

POVEZANOST RADA