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Article overview
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The consistency of interdecadal changes in the Earth's rotation variations | | Yachong An
; Hao Ding
; Zhifeng Chen
; | | Date: |
12 Jul 2021 | | Abstract: | To accurately restore interdecadal oscillations from the length of day
variation ({Delta}LOD) and the polar motion (PM), we propose a normal
time-frequency transform (NTFT) combing with curve fitting scheme. Compared
with the NTFT, the combined NTFT with a boundary extreme point
mirror-image-symmetric extension (BEPME) process, and singular spectrum
analysis (SSA) in some simulated tests, the superiority and reliability of this
new scheme have been confirmed; and we further verified the validity of it in a
mature case analysis from the Earth’s free oscillation modes 0S0 and 1S0. After
then, we use it to restore the ~5.9yr oscillation (referred to as SYO) and
~8.5yr oscillation (referred to as EYO) from the {Delta}LOD and the PM
records. Our results reconfirm that the SYO and EYO in the {Delta}LOD (and PM)
have no stable damping trend (which is different from results in some previous
studies), and for the first time, we find that the SYOs (and EYOs) contained in
the {Delta}LOD and the PM show very good consistency. Such consistency
demonstrates that the SYOs/EYOs in the {Delta}LOD and the PM must come from
the same source. As the external excitation sources of the Earth rotation
contain no such oscillations, we suggest that core motions are possible
sources. | | Source: | arXiv, 2107.05449 | | Services: | Forum | Review | PDF | Favorites | |
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