Naslov
Towards a characterization of temporal gravity field variations in GRACE observations and global hydrology models

Autori
Petrović, Svetozar ; Schmidt, Roland ; Wünsch, Johann ; Barthelmes, Franz ; Güntner, Andreas ; Rothacher, Markus

Izvornik
Harita dergisi (1300-5790) 73 (2007), Special Issue: 18; 199-204

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
time-variable gravity; GRACE satellite mission; global hydrological models; coherence; degree correlations; empirical orthogonal functions

Sažetak
In order to exploit the GRACE based time-variable gravity signals (e.g. in hydrological modeling of the global water cycle) appropriate techniques to separate the relevant hydrological signal from the integral satellite gravity data will be needed. Recent investigations focus on comparisons on the basis of time variations of the Earth gravity field reconstructed from monthly GRACE-only gravity field solutions and global hydrological models. This shows both pronounced similarities and considerable differences. On the other hand, since the same holds for comparisons between various state-of the-art hydrology models, a more general view on the morphology of time-variable gravity signals due to hydrological mass redistributions will be needed. In a preparatory study to this end we have investigated time-variable signals derived from three different state-of-the-art global hydrology models and from recent time series of monthly GRACE-only gravity models. In order to infer common characteristic features from the distinct data sources we use spectral coherence analysis and Empirical Orthogonal Functions analysis in the space domain. The contribution presents current results.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Geodezija

POVEZANOST RADA