Low-degree gravity change from GPS data of COSMIC and GRACE satellite missions

Tingjung Lin, Cheinway Hwang, Tzu Pang Tseng, B. F. Chao

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11 引文 斯高帕斯(Scopus)

摘要

This paper demonstrates estimation of time-varying gravity harmonic coefficients from GPS data of COSMIC and GRACE satellite missions. The kinematic orbits of COSMIC and GRACE are determined to the cm-level accuracy. The NASA Goddard's GEODYN II software is used to model the orbit dynamics of COSMIC and GRACE, including the effect of a static gravity field. The surface forces are estimated per one orbital period. Residual orbits generated from kinematic and reference orbits serve as observables to determine the harmonic coefficients in the weighted-constraint least-squares. The monthly COSMIC and GRACE GPS data from September 2006 to December 2007 (16 months) are processed to estimate harmonic coefficients to degree 5. The geoid variations from the GPS and CSR RL04 (GRACE) solutions show consistent patterns over space and time, especially in regions of active hydrological changes. The monthly GPS-derived second zonal coefficient closely resembles the SLR-derived and CSR RL04 values, and third and fourth zonal coefficients resemble the CSR RL04 values.

原文English
頁(從 - 到)34-42
頁數9
期刊Journal of Geodynamics
53
發行號1
DOIs
出版狀態Published - 2012 1月

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地表過程

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