Space Hydrology: What We Can Expect Today from the GRACE Mission
Biancale, R1; Lemoine, J-M1; Bruinsma, S1; Perosanz, F1; Balmino, G1; Bourgogne, S2; Ramilien, G3
1CNES/GRGS; 2NOVELTIS; 3LEGOS
Since 2002 the GRACE satellite mission has innovated a new means of surveying water mass variations on ground at very large scale (over 500km presently). This can be achieved through micrometric inter-satellite measurements at nearly 500 km altitude. Nevertheless the procedure for isolating water mass variations is quite complex and depends mainly on the a priori knowledge and modelling of other sources of mass displacement (solid Earth, atmosphere, oceanů).
We propose here:
- to show how continental mass variations are computed from space data;
- to evaluate mass variations per hydrologic basin; from 2002 to 2007;
- to compare with some hydrological models or other in situ data.
The GRGS GRACE water mass variation products are available to the scientific community through the BGI web site (http://bgi.cnes.fr). They could be used for refining the large scales of hydrological models.