Open AccessEstimating geocenter variations from a combination of GRACE and ocean model output
Author(s) -
Swenson Sean,
Chambers Don,
Wahr John
Publication year - 2008
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2007jb005338
Subject(s) - satellite , satellite laser ranging , degree (music) , geodesy , series (stratigraphy) , climatology , component (thermodynamics) , meteorology , geology , environmental science , geography , physics , laser ranging , paleontology , laser , astronomy , acoustics , optics , thermodynamics
In this study, we estimate a time series of geocenter anomalies from a combination of data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission and the output from ocean models. A matrix equation is derived relating total geocenter variations to the GRACE coefficients of degrees two and higher and to the oceanic component of the degree one coefficients. We estimate the oceanic component from two state‐of‐the‐art ocean models. Results are compared to independent estimates of geocenter derived from other satellite data, such as satellite laser ranging and GPS. Finally, we compute degree one coefficients that are consistent with the processing applied to the GRACE Level‐2 gravity field coefficients. The estimated degree one coefficients can be used to improve estimates of mass variability from GRACE, which alone cannot provide them directly.