Amplitude and phase variations of Earth's Chandler wobble under continual excitation

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Title:	Amplitude and phase variations of Earth's Chandler wobble under continual excitation
Authors:	趙丰;Chao, Benjamin F.;Chung, Wei-Yung
Contributors:	地球科學學院地球科學學系
Keywords:	Amplitudes;Chandler wobble;Computer simulation;Earth;Earth rotation;Excitation;Geodynamics;Monte Carlo methods;Phase shift;Polar motion;Time series
Date:	2012-12-01
Issue Date:	2026-04-23 11:28:08 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： ► We demonstrate a physical explanation for the baffling behavior of CW during ∼1925. ► In pendulum analogy, a phase jump would occur when a near-zero amplitude is reached. ► We do so by simulating the statistical behavior of the Earth's CW by Monte Carlo. ► The peculiar event was fortuitous and not something extraordinary that had occurred. We demonstrate a simple physical explanation for the cause of the well-known but so-far baffling behavior of the Chandler wobble during ∼1925 when it reached a near-zero amplitude and underwent a concurrent large phase jump. We do so by numerical Monte-Carlo simulations, designed based on simple physical reasoning, of the statistical behavior of the Earth's Chandler wobble under continual excitation. Rather than subscribing to the view that something extraordinary or anomalous had occurred to the Earth system sometime during the later half of the 1920s, we assert the scenario that the Chandler wobble excitation during that time happened to oppose and cancel the Chandler motion momentarily before starting anew the motion that became unrelated to its immediate past, hence manifesting as an apparent phase jump in the time series. The seemingly peculiar event was simply fortuitous by chance. 出版者： Elsevier Ltd 出版日期： 2012-12 出處： Journal of geodynamics, 2012-12, Vol.62, p.35-39 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2011 Elsevier Ltd 識別號： ISSN: 0264-3707 識別號： DOI: 10.1016/j.jog.2011.11.009
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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