Mon Aug 24, F. Flechtner
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Cheng, Minkang, 2026. Oscillations in the Earth's figure axis from 50–yr SLR data and polar motion. Geophysical Journal International, 246(2):ggag206, doi:10.1093/gji/ggag206.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026GeoJI.246..206C,
author = {{Cheng}, Minkang},
title = "{Oscillations in the Earth's figure axis from 50-yr SLR data and polar motion}",
journal = {Geophysical Journal International},
year = 2026,
month = aug,
volume = {246},
number = {2},
eid = {ggag206},
pages = {ggag206},
abstract = "{The Earth's figure axis is the axis of maximum inertia for the deformed
(oblate) Earth, as described by the degree-two, order-one
geopotential coefficients C$_{21}$ and S$_{21}$. An extended
mean-pole model is presented for evaluating solid-Earth and
ocean-pole tides. 50-yr Satellite Laser Ranging (SLR) data and
24-yr GRACE/GRACE-FO (Gravity Recovery and Climate Experiment
and followon) data were analysed to determine variations in
Earth's figure axis, as reflected in changes in the C$_{21}$ and
S$_{21}$ coefficients. This study reveals that a significant
atmosphere-ocean motion induced a variation in C$_{21}$ that is
captured by SLR data but does not appear in the GRACE solution.
The current glacial isostatic adjustment ICE-6 G model requires
improvement to account for the observed linear rates of C$_{21}$
and S$_{21}$. A significant 30- and 60-yr signal with an
amplitude of {\ensuremath{\sim}}3 {\texttimes}
10$^{{\ensuremath{-}}11}$ in the Earth's figure axis is observed
using SLR and an amplitude of {\ensuremath{\sim}}10 mas in the
polar-motion, which could be predominantly driven by a 0.05-deg
tilt of the inner-core figure axis relative to the figure axis
of the entire core and is linked to partial electromagnetic
core--mantle coupling.}",
doi = {10.1093/gji/ggag206},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026GeoJI.246..206C},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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