Mon Feb 16, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Shi, Qiqi, Zhou, Yonghong, Chen, Jianli, and Xu, Xueqing, 2025. Recent disappearing and re–excited Earth's Chandler wobble: contributions from GRACE/GFO hydrological and cryospheric mass changes. Journal of Geodesy, 99(12):97, doi:10.1007/s00190-025-02021-w.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025JGeod..99...97S,
author = {{Shi}, Qiqi and {Zhou}, Yonghong and {Chen}, Jianli and {Xu}, Xueqing},
title = "{Recent disappearing and re-excited Earth's Chandler wobble: contributions from GRACE/GFO hydrological and cryospheric mass changes}",
journal = {Journal of Geodesy},
keywords = {Earth's Chandler wobble, Hydrology, Cryosphere, Satellite gravity, Earth Sciences, Physical Geography and Environmental Geoscience},
year = 2025,
month = nov,
volume = {99},
number = {12},
eid = {97},
pages = {97},
abstract = "{Geophysical sources and processes that excite the Earth's Chandler
wobble (CW) have long been debated. Significant discrepancies
remain at times between geophysical fluid models, especially
regarding inaccurate hydrological and cryospheric estimates, and
observed CW series. Recently, the CW experienced anomalous
behavior after 2015, with a disappearance and a re-excitation.
Understanding hydrological and cryospheric effects on the CW and
their contributions to this anomaly requires urgent
investigation. Utilizing the Gravity Recovery and Climate
Experiment (GRACE) and GRACE Follow-On (GFO) measurements, we
reconstruct the CW series contributed from the hydrology and
cryosphere for the GRACE period (April 2002 to December 2015)
and GFO period (June 2018 to December 2024), respectively. We
find that GRACE/GFO measurements can capture more accurate
hydrological and cryospheric forcing CW signals than models. For
the first time, our reconstructed results successfully account
for the recent observed disappearing and re-excited CW
phenomenon. Considering global mass conservation associated with
barystatic sea-level changes, the GRACE/GFO-derived hydrological
and cryospheric effects agree well with geodetic CW
observations. The absence of hydrological and cryospheric
contributions on the reconstructed CW would lead to the
unmanifested CW re-excitation phenomenon. Additionally, the
relative contributions of the hydrology and cryosphere to CW
amplitudes exhibit temporal variability, with ratios of
approximately 3 to 1 and 2 to 1 during the GRACE and GFO
periods, respectively. These findings improve our understanding
of the Earth's rotational dynamics under climate change in
relation to the effects of hydrological and cryospheric
processes.}",
doi = {10.1007/s00190-025-02021-w},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025JGeod..99...97S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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