| Determination of the Earth＇s free core nutation parameters by using tidal gravity data |
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| 引用本文： | 刘明波,孙和平,徐建桥,周江存.Determination of the Earth＇s free core nutation parameters by using tidal gravity data[J].地震学报(英文版),2007,20(6):708-711. |
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| 作者姓名： | 刘明波 孙和平 徐建桥 周江存 |
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| 作者单位： | [1]Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| 基金项目： | The Knowledge Innovation Project of Chinese Academy of Sciences （KZCX2-YW-133） and National Natural Science Foundation of China （40574034 and 40730316）. |
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| 摘 要： | The Earth＇s free core nutation （FCN） is a retrograde eigenrnode which is attributed to the interaction between the solid mantle and the liquid core of the rotational elliptical Earth. This mode appears as an eigenmode of nearly diurnal free wobble （NDFW） in a terrestrial reference frame with a period of about one day （XU et al, 2001）. Therefore, the NDFW will lead to an obvious resonance enhancement in the diurnal tidal gravity observations, especially those of the tidal waves with frequencies closed to its eigenfrequency such as P1, K1, ψ1 and Ф1. The FCN resonance parameters can be retrieved accurately by high-precision tidal gravity observations, especially those recorded with the superconducting gravimeters （SG）. The Global Geodynamics Project （GGP） organized by IUGG took it as an important content for determining the FCN resonance parameters by using gravity data. However, the results are affected by many factors such as station location, background noise, the selection of the tide-generating potential tables, ocean tide models, data processing techniques and so on. In our study, the FCN parameters will be retrieved by using the SG observations at Wuhan, and the effects of the choices of various tide-generating potential tables, oceanic models and weight functions on the estimation of the FCN parameters will be discussed in detail,
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| 关 键 词： | 超导重力仪 谐振参数 地震学 震波 |
| 文章编号： | 1000-9116（2007）06-0708-04 |
| 收稿时间： | 2007-01-26 |
| 修稿时间： | 2007-09-30 |
Determination of the Earth’s free core nutation parameters by using tidal gravity data |
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| Liu Ming-bo , Sun He-ping , Xu Jian-qiao and Zhou Jiang-cun.Determination of the Earth’s free core nutation parameters by using tidal gravity data[J].Acta Seismologica Sinica(English Edition),2007,20(6):708-711. |
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| Authors: | Liu Ming-bo Sun He-ping Xu Jian-qiao and Zhou Jiang-cun |
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| Institution: | (1) Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, 430077, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, China |
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| Abstract: | The Earth’s free core nutation (FCN) is a retrograde eigenmode which is attributed to the interaction between the solid mantle
and the liquid core of the rotational elliptical Earth. This mode appears as an eigenmode of nearly diurnal free wobble (NDFW)
in a terrestrial reference frame with a period of about one day (XU et al, 2001). Therefore, the NDFW will lead to an obvious resonance enhancement in the diurnal tidal gravity observations, especially
those of the tidal waves with frequencies closed to its eigenfrequency such as P1, K1, Ψ1 and Φ1. The FCN resonance parameters can be retrieved accurately by high-precision tidal gravity observations, especially those
recorded with the superconducting gravimeters (SG). The Global Geodynamics Project (GGP) organized by IUGG took it as an important
content for determining the FCN resonance parameters by using gravity data. However, the results are affected by many factors
such as station location, background noise, the selection of the tide-generating potential tables, ocean tide models, data
processing techniques and so on. In our study, the FCN parameters will be retrieved by using the SG observations at Wuhan,
and the effects of the choices of various tide-generating potential tables, oceanic models and weight functions on the estimation
of the FCN parameters will be discussed in detail.
Foundation item: The Knowledge Innovation Project of Chinese Academy of Sciences (KZCX2-YW-133) and National Natural Science Foundation of
China (40574034 and 40730316). |
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| Keywords: | superconducting gravimeter free core nutation resonance parameters |
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