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Unique Approaches to Analysis of Time-Variable Gravity from GRACEWe have developed an innovative analysis strategy for analysis of GRACE data. We have developed a capability to recover local/regional gravity changes using non-global functional representations (Le. surface anomalies vs. global spherical harmonics) h m the GRACE data. Our approach can take regularly or irregularly shaped regions, populate them with surface anomaly blocks of suitable area and solve for the resulting mass flux with respect to a mean field. The surface mass or gravity anomalies benefit from the application of spatial and temporal constraints to add stability to the solution. In this paper we discuss the analysis of four months of GRACE Level 1B data (accelerometry, intersatellite data, attitude information and precise orbits) from July to October 2003, recently released to the GRACE Science Team. We compare and contrast this local approach to gravity recovery, with the more conventional approach using global spherical harmonics. We review simulations of this technique which allow us to pinpoint optimum strategies for applications of this local gravity recovery approach.
Document ID
20040171151
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Lemoine, Frank G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Luthcke, S. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rowlands, D. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cox, C. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kloska, S. M.
(Raytheon Information Technology and Scientific Services Upper Marlboro, MD, United States)
Chinn, D. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Numerical Analysis
Meeting Information
Meeting: Joint CHAMP/GRACE Science Meeting
Location: Potsdam
Country: Germany
Start Date: July 6, 2004
End Date: July 8, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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