Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model

J. Kusche*, R. Schmidt, S. Petrovic, R. Rietbroek

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

202 Citations (Scopus)

Abstract

We have analyzed recent gravity recovery and climate experiment (GRACE) RL04 monthly gravity solutions, using a new decorrelating post-processing approach. We find very good agreement with mass anomalies derived from a global hydrological model. The post-processed GRACE solutions exhibit only little amplitude damping and an almost negligible phase shift and period distortion for relevant hydrological basins. Furthermore, these post-processed GRACE solutions have been inspected in terms of data fit with respect to the original inter-satellite ranging and to SLR and GPS observations. This kind of comparison is new. We find variations of the data fit due to solution post-processing only within very narrow limits. This confirms our suspicion that GRACE data do not firmly 'pinpoint' the standard unconstrained solutions. Regarding the original Kusche (J Geod 81:733-749, 2007) decorrelation and smoothing method, a simplified (order-convolution) approach has been developed. This simplified approach allows to realize a higher resolution - as necessary, e.g., for generating computed GRACE observations - and needs far less coefficients to be stored.

Original languageEnglish
Pages (from-to)903-913
Number of pages11
JournalJournal of Geodesy
Volume83
Issue number10
DOIs
Publication statusPublished - 8 Mar 2009
Externally publishedYes

Keywords

  • Decorrelation
  • GRACE
  • Hydrological model validation
  • Smoothing
  • Time-variable gravity
  • ITC-CV

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