Observing long-term FCR variation using Esashi extensometers
文献类型：期刊论文
| 作者 | Ping, JS; Tsubokawa, T; Tamura, Y; Heki, K; Matsumoto, K; Sato, T |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2006 |
| 卷号 | 41期号:1-3页码:155-163 |
| 关键词 | extensometers Esashi station long-term FCR variation topography of CMB |
| 英文摘要 | Long duration precise and stable tidal observations are recorded to detect the temporal variation of free core nutation (also called the fluid core resonance, FCR) parameters, so as to reveal geophysical and dynamical processes at the core mantle boundary (CMB) of the Earth. At Esashi Earth Tides Station of National Astronomical Observatory of Japan, the tidal admittance and the non-tidal signal are estimated from 17 years of records with three extensometer data. From the estimated admittances of diurnal tidal constituents, the FCR parameters are fitted. The obtained time series of FCR eigenperiod and quality factor show 10-11 years scale temporal variation. The range of the eigenperiod variation is several dozens sidereal days (s.d.). This phenomenon is validated and confirmed by the gravitational tidal observation of a co-located super-conducting gravimeter (SG) with the observation from 1992 to 2002. Overestimated atmospheric response, extra loading effects from the temporal variations of local rock properties and of ocean tidal constituents, as well as the flattening variation of the topography at CMB are suggested to be the possible mechanisms to cause the periodical variation of FCR parameters. (c) 2005 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | JAPAN ; PARAMETERS |
| 收录类别 | SCI ; ISTP |
| 语种 | 英语 |
| WOS记录号 | WOS:000235346600019 |
| 公开日期 | 2010-07-30 |
| 源URL | [http://119.78.226.72//handle/331011/10028]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.CAS, Shanghai Astron Observ, NAOC, Shanghai 200030, Peoples R China 2.Natl Astron Observ, Mizusawa, Iwate 0230861, Japan 3.Hokkaido Univ, Div Earth & Planetary Sci, Sapporo, Hokkaido 0600810, Japan |
| 推荐引用方式 GB/T 7714 | Ping, JS,Tsubokawa, T,Tamura, Y,et al. Observing long-term FCR variation using Esashi extensometers[J]. JOURNAL OF GEODYNAMICS,2006,41(1-3):155-163. |
| APA | Ping, JS,Tsubokawa, T,Tamura, Y,Heki, K,Matsumoto, K,&Sato, T.(2006).Observing long-term FCR variation using Esashi extensometers.JOURNAL OF GEODYNAMICS,41(1-3),155-163. |
| MLA | Ping, JS,et al."Observing long-term FCR variation using Esashi extensometers".JOURNAL OF GEODYNAMICS 41.1-3(2006):155-163. |
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来源：上海天文台
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