Mon Oct 13, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Löcher, Anno, Kusche, Jürgen, and Nie, Yufeng, 2025. A 40-year record of the Earth's time-variable gravity field from SLR and DORIS. Advances in Space Research, 76(3):1281–1291, doi:10.1016/j.asr.2025.05.089.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025AdSpR..76.1281L,
author = {{L{\"o}cher}, Anno and {Kusche}, J{\"u}rgen and {Nie}, Yufeng},
title = "{A 40-year record of the Earth's time-variable gravity field from SLR and DORIS}",
journal = {Advances in Space Research},
keywords = {Time-variable gravity field, Satellite laser ranging, DORIS, GRACE, Empirical orthogonal functions},
year = 2025,
month = aug,
volume = {76},
number = {3},
pages = {1281-1291},
abstract = "{Since 2002, the temporal variations of the Earth's gravity field are
measured by the missions GRACE and GRACE Follow-On with
unprecedented resolution and accuracy. In this study, we present
a series of GRACE-like solutions going back to 1984 based on
tracking data to 16 satellites, observed either by satellite
laser ranging (SLR) or by means of the Doppler Orbitography and
Radiopositioning Integrated by Satellites (DORIS) system. The
match with GRACE in spatial resolution is achieved by
representing the gravity field by empirical orthogonal functions
(EOFs) obtained by a principal component analysis of the
GRACE/GRACE-Follow-On solutions. To make the modelling more
adaptive, the EOFs are supplemented by low-degree spherical
harmonics. The presented time series is intended to replace a
previous SLR-only solution applying the same parametrization. It
is shown that the combined SLR/DORIS solution is clearly
superior, reducing the average difference to the GRACE/GRACE-
Follow-On fields by 10.6 percent; on a local scale, the error is
reduced by up to 52 percent. As another enhancement, the
beginning of the time series was advanced by eight years by
extending the analysis to historical SLR data, albeit the noise
in these early gravity solutions is higher, as expected. The
time series now also includes a degree-1 solution based on an
own inversion approach and using the surface mass distribution
from the SLR/DORIS fields.}",
doi = {10.1016/j.asr.2025.05.089},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025AdSpR..76.1281L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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