Fri Apr 10, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Lemoine, Jean–Michel, Bourgogne, Stéphane, Gégout, Pascal, Reinquin, Franck, Marty, Jean–Charles, Mercier, Flavien, Loyer, Sylvain, Bruinsma, Sean, and Balmino, Georges, 2026. 22 years of time–variable gravity field determination from GRACE and GRACE Follow–On: the CNES/GRGS RL05 solution. Journal of Geodesy, 100(2):20, doi:10.1007/s00190-026-02040-1.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026JGeod.100...20L,
author = {{Lemoine}, Jean-Michel and {Bourgogne}, St{\'e}phane and {G{\'e}gout}, Pascal and {Reinquin}, Franck and {Marty}, Jean-Charles and {Mercier}, Flavien and {Loyer}, Sylvain and {Bruinsma}, Sean and {Balmino}, Georges},
title = "{22 years of time-variable gravity field determination from GRACE and GRACE Follow-On: the CNES/GRGS RL05 solution}",
journal = {Journal of Geodesy},
keywords = {GRACE, GRACE-FO, Time-variable gravity field, K band ranging, Satellite laser ranging, Hydrology, Oceanography, Cryosphere, Earthquakes, Engineering, Geomatic Engineering},
year = 2026,
month = feb,
volume = {100},
number = {2},
eid = {20},
pages = {20},
abstract = "{The GRACE and GRACE Follow-On (GRACE-FO) missions aim to track temporal
changes in Earth's gravity field. Using data from these
missions, CNES/GRGS has produced the ``RL05'' satellite-only
series of geopotential solutions in spherical harmonics up to
degree and order 90. These solutions are available at both
monthly and 10-day temporal resolutions, covering the period
from April 2002 to July 2025. These solutions were derived using
a distinct processing strategy{\textemdash}particularly with
respect to background models and solution stabilization
techniques{\textemdash}compared to those adopted by most other
groups involved in GRACE/GRACE-FO data processing. Nevertheless,
the core parameter estimation approach remains fundamentally the
same. The main differences with other processing centers are the
combination of Satellite Laser Ranging (SLR) data from geodetic
satellites with GRACE data at the normal equation level (and not
as a substitution of low-degree SH coefficients) and the use of
truncated singular value decomposition (TSVD) for the time-
variable gravity (TVG) field solution. Examination of TVG time
series over test areas such as the Caspian Sea and Iceland
demonstrates the advantages of TSVD resolution over conventional
unconstrained methods such as Cholesky decomposition, which
require post-processing filtering. The DDK5 filter, for
instance, produces a strong decrease in the restored signal from
spherical harmonic degree 50, compared to approximately degree
70 for the TSVD solution. Our TSVD solution is also compared to
mascon solutions, showing a commensurability of the signal
content of the solutions, with the advantage of not relying on
geophysical assumptions and of providing, on the oceans, a less
constrained solution than mascons. Finally, an evaluation of the
noise of these different solutions is carried out by estimating
and comparing the errors of the solutions on the regions where
the TVG signal is particularly weak. The noise is estimated at
the level of 1.0 to 4.6 cm equivalent water height (EWH),
depending on the resolution, for the DDK5-filtered RL06
solutions from CSR, JPL and GFZ, and at the level of 0.9─3.3 cm
EWH for the COST-G, TUGRAZ and CNES-RL05-TSVD solutions.}",
doi = {10.1007/s00190-026-02040-1},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026JGeod.100...20L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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