Decadal Long Wavelength Gravity Field Variations From GRACE and LAGEOS Satellite Missions

Three years of available GRACE data have given us the opportunity to compute decadal gravity field models, from March 2002 to March 2005 up to a resolution of 400 km. They are based on a global solution expanded in spherical harmonic expansion (up to degree 150) over these same three years. SLR data from LAGEOS satellites are used as well in order to better constrain the degree 2 of each field. On one hand, this series of models is presented with some details concerning the a priori models and parameterisation used. On the other hand, assessments of land and ocean geoid variations are shown and compared to other sources of data.