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Mascon solutions with GRACE and GOCE for Time-Variable Gravity Recovery

Frank Lemoine(1), Scott Luthcke(2), David Rowlands(1), Richard Ray(1), Despina Pavlis(3), John McCarthy(3), Steve Klosko(3), Douglas Chinn(3), Sean Bruinsma(4) and Jean-Charles Marty(4)

(1) NASA GSFC, Code 698, Greenbelt, MD 20771, United States
(2) NASA GSFC, Code 698, Greenbelt, MD 20771, United States
(3) SGT Inc.,, Greenbelt Road, Greenbelt, MD 20770, United States
(4) CNES, 18, Avenue Edouard Belin, Toulouse, 31401 Cedex 09, France

Abstract

The GRACE and GOCE gravity missions provide unique and complementary sensitivity into the gravity spectrum. The GRACE data so far have been used to provide an order of magnitude improvement in the static gravity field, and a window into the mass variations on time scales as short as ten days and on spatial scales as short as 400 km. The localized nature of the GRACE inter-satellite measurement lends itself to localized solutions with mascons (mass concentrations) that offer unique advantages over solutions obtained using spherical harmonics. We review the latest mascon solutions from GRACE, and investigate the feasibility of integrating the data from both GRACE and GOCE in a complementary fashion to enhance the time-variable gravity recovery. In addition we describe the signal and information content of GRACE and GOCE gravity solutions compared with the signal spectrum from time-variable signals such as land hydrology, ocean tides, and surface ice mass variations.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry