A detailed description of CNES monthly and 10-day time-variable gravity solutions and a summary of the improvements to be applied to the next reprocessing
Year: 2026
Type: conference-abstract
Abstract: CNES has been producing solutions of the time-variable gravity field from GRACE and GRACE-FO data for many years. In addition to the unconstrained solutions — which along with many others are submitted to the COST-G international service to derive a combined monthly solution — CNES produces original stabilized solutions at monthly and 10-day time resolutions. These solutions thus differ from both unstabilized spherical harmonic solutions and mascon solutions.This presentation aims to detail the processes used to derive our solutions, specifically the singular value decomposition technique stabilized by a Tikhonov constraint, and the incorporation at the normal equations level of SLR data necessary for the accurate determination of low-degree terms. A comparison of the resulting solutions with spherical harmonic and mascon solutions will be presented. We will also outline efforts underway for a complete reprocessing of GRACE and GRACE-FO data, including the testing of new de-aliasing and ocean tide models, the fixing of GPS integer ambiguities, and the incorporation of instrument and geophysical model variance-covariance matrices required for data processing.
DOI: 10.5194/gstm2026-73
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7213889083