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Estimation of period and Q of the Chandler wobble

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Title: Estimation of period and Q of the Chandler wobble
Authors: Furuya, Masato Browse this author →KAKEN DB
Chao, B. F. Browse this author
Keywords: atmospheric angular momentum
Chandler wobble
Issue Date: Dec-1996
Publisher: Oxford University Press
Journal Title: Geophysical Journal International
Volume: 127
Issue: 3
Start Page: 693
End Page: 702
Publisher DOI: 10.1111/j.1365-246X.1996.tb04047.x
Abstract: The period P and Q-value of the Chandler wobble are two fundamental functional of the Earth's internal physical properties and global geodynamics. We revisit the problem of the estimation of P and Q, using 10.8 yr of modern polar motion as well as contemporary atmospheric angular momentum (AAM) data. We make full use of the knowledge that AAM is a major broad-band excitation source for the polar motion. We devise two optimization criteria under the assumption that, after removal of coherent seasonal and long-period signals, the non-AAM excitation is uncorrelated with the AAM. The procedures lead to optimal estimates for P and Q. Our best estimates, judging from comprehensive sets of Monte Carlo simulations, are P= 433.7 ± 1.8 (1σ) days, Q=49 with a la range of (35, 100). In the process we also obtain (as a by-product) an estimate of roughly 0.8 for a ‘mixing ratio’ of the inverted-barometer (IB) effect in the AAM pressure term, indicating that the ocean behaves nearly as IB in polar motion excitation on temporal scales from months to years
Rights: This article has been accepted for publication in Geophysical Journal International ©:The Authors 1996 Published by Oxford University Press on behalf of The Royal Astronomical Society All rights reserved.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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