In Phase I two composite time-series, the hydrology corrected GRACE derived time-variable mass change and the steric-corrected sea level change from altimeter observations, are regionally compared at seasonal and interannual scales over the interval 2002-2007. The leakage of mass change from land in the GRACE estimates of ocean mass change is accounted for by removing hydrologic models (Fenoglio et al., 2006, 2007). The leakage of the remaining land signal is largest in the smallest basin considered, the Black Sea.
In Phase III the assimilation of data in models will play a very important role in constraining and improving models. On land, GRACE will provide data input to hydrology modelling in regions where traditional data are missing. On sea GRACE data will be used for constraining time-variable mass transport. The effects of de-aliasing on the GRACE fields and the leakage effects in small basins are studied. Furthermore, GOCE data will be used to better quantify the mean circulation in the Black Sea.
1) Fenoglio-Marc L., J. Kusche and M. Becker (2006). Mass variation in the M Fenoglio-Marc, L., J. Kusche, and M. Becker (2006), Mass variation in the Mediterranean Sea from GRACE and its validation by altimetry, steric and hydrologic fields, Geophys. Res. Lett., 33, L19606, doi:10.1029/2006GL026851
2) Fenoglio-Marc L., J. Kusche, M. Becker and I. Fukumori (2007). Comments on “On the steric and mass-induced contributions to the annual sea level variations in he Mediterranean Sea” by D. Garcia et al., J. of Geoph. Res., Vol. 112, C12018,doi:10.1029/2007JC004196
3) Fenoglio-Marc L., J. Kusche, M. Becker (2007). Estimation of mass variation and mean dynamic topography in the Mediterranean Sea from altimetry and GRACE/GOCE geoids, in 3rd GOCE Users Symposium Proceedings, SP-627, ESA Publications Division
4) Kusche, J (2007): Approximate decorrelation and non-isotropic smoothing of time-variable GRACE-type gravity fields, Journal of Geodesy, 81:733-749.
5)Kusche J, Schmidt R, Petrovic S, Rietbroek R (2009): Decorrelated GRACE time-variable gravity solutions for science by GFZ, and their validation using a hydrological model, Journal of Geodesy, (accepted Feb 2009)
More information from: www.ipg.tu-darmstadt.de/en/p_fenoglio