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Estimation of period and Q of the Chandler wobble
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 |
URI: | http://hdl.handle.net/2115/52821 |
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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Submitter: 古屋 正人
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