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中国科学院大学学报 ›› 2003, Vol. 20 ›› Issue (2): 247-253.DOI: 10.7523/j.issn.2095-6134.2003.2.021

• 优秀博士论文 • 上一篇    下一篇

地球液核动力学效应的研究和检测(英文)

徐建桥, 孙和平   

  1. 中国科学院测量与地球物理研究所动力大地测量学重点实验室, 武汉 430077
  • 收稿日期:2002-12-02 发布日期:2003-03-10
  • 作者简介:徐建桥:在博士研究生学习期间,在国内外重要学术刊物上发表论文10余篇,荣获中国地球物理学会1998年度青年优秀论文(傅承义)奖和2002年度中国科学院院长奖学金特别奖.导师孙和平研究员:主要从事地球重力场和地球动力学方面的研究工作.

Study and Detection on the Geodynamic Effects of the Earth's Fluid Outer Core

XU Jian-Qiao SUN He-Ping   

  1. Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
  • Received:2002-12-02 Published:2003-03-10
  • Supported by:

    supported by the NNSF (40174022 and 49925411)) and Chinese Academy of Sciences (KZCX2-106)

摘要:

综合分析处理了包括武汉台在内的全球地球动力学(GGP)台站超导重力仪长期、连续重力观测资料,研究和检测了地球液核的动力学效应.系统讨论了在日月引潮力、表面负荷和液核动力学行为引起的核幔边界及内核边界上,压力和重力扰动等不同驱动力作用下,地球的弹性引力形变响应.基于周日重力潮汐观测中的共振放大特征,通过国际超导重力仪观测资料的迭积,研究了地球的自由和章动(FCN),精密确定了FCN参数.采用位移场的变分方法研究了液核的自由振荡,严密推导获得了用于有限元数值计算的本征值-本征向量问题.同时采用GGP台站超导重力仪长期、连续、高质量重力观测数据,研究了固体内核的平动振荡.

关键词: 超导重力仪, 全球地球动力学计划, 地球的形变响应, 自由核章动, 液核自由振荡

Abstract:

The long-term, continuous gravity data, recorded with superconducting gravimeters (SCG) at the Global Geodynamics Project (GGP) observatories including one at Wuhan, and the corresponding station atmospheric pressure records have been comprehensively processed and analyzed in order to study and detect the geodynamical effects of the Earth's fluid outer core (FOC). The elasto-gravitational deformation responses of the Earth to thesolar-luni tidal forces, surface tractions and the perturbations of the pressure and gravity on the core-mantle boundary (CMB) and the solid inner core boundary (ICB) due to the dynamical behaviors of the FOC, are systematically discussed. Based on the resonance enhancement in diurnal tidal gravity observations, the Earth's free core nutation (FCN) is studied by stacking the tidal gravity data obtained with the international SCG. As a result, the FCN parameters are determined accurately. The free oscillations of the FOC are theoretically investigated by using a variational approach of the displacement field. And the corresponding eigenvalue-eigenvector problem for the finite element computation is deduced. By simultaneouslyusing the long-term, continuous and high-quality gravity data observed with the SCG at the GGP observatories, the translational oscillations of the solid inner core is studied.

Key words: superconducting gravimeters, global geodynamics project, deformation responses of the earth, free core nutation, free oscillations of the fluid outer core

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