| 武汉台重力潮汐长期观测结果 |
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| 引用本文： | 徐建桥,周江存,陈晓东,孙和平.武汉台重力潮汐长期观测结果[J].地球物理学报,2014,57(10):3091-3102. |
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| 作者姓名： | 徐建桥 周江存 陈晓东 孙和平 |
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| 作者单位： | 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 武汉 430077 |
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| 基金项目： | 国家重点基础研究(973)计划项目(2014CB845902),国家自然科学基金(41274085,41074053和41321063)和中国科学院重要方向项目资助. |
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| 摘 要： | 采用武汉台超导重力仪(SG C032)14年多的长期连续观测资料,研究了固体地球对二阶和三阶引潮力的响应特征,精密测定了重力潮汐参数,系统研究了最新的固体潮模型和海潮模型在中国大陆的有效性.采用最新的8个全球海潮模型计算了海潮负荷效应,从武汉台SG C032的观测中成功分离出63个2阶潮汐波群和15个3阶潮汐波群信号,3阶潮波涵盖了周日、半日和1/3日三个频段.重力潮汐观测的精度非常高,标准偏差达到1.116 nm·s-2,系统反映了非流体静力平衡、非弹性地球对2阶和3阶引潮力的响应特征.结果表明,现有的武汉国际重力潮汐基准在半日频段非常精确,但在周日频段存在比较明显的偏差,需要进一步精化.对于中国大陆的大地测量观测,固体潮可以采用Dehant等考虑地球内部介质非弹性和非流体静力平衡建立的固体潮理论模型或Xu 等基于全球SG观测建立的重力潮汐全球实验模型作为参考和改正模型,海潮负荷效应应该采用Nao99作为改正模型.
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| 关 键 词： | 超导重力仪 重力潮汐参数 武汉国际重力潮汐基准 固体潮模型 海潮模型 |
| 收稿时间： | 2014-01-13 |
Long-term observations of gravity tides from a superconducting gravimeter at Wuhan |
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| XU Jian-Qiao,ZHOU Jiang-Cun,CHEN Xiao-Dong,SUN He-Ping.Long-term observations of gravity tides from a superconducting gravimeter at Wuhan[J].Chinese Journal of Geophysics,2014,57(10):3091-3102. |
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| Authors: | XU Jian-Qiao ZHOU Jiang-Cun CHEN Xiao-Dong SUN He-Ping |
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| Institution: | State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China |
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| Abstract: | By using the continuous gravity data recorded with a superconducting gravimeter (SG C032) over 14 years at Wuhan station, the response features of the solid Earth to the tidegenerating forces of the second and third degree are investigated, and the gravimetric parameters are accurately retrieved,which validates the recent models of the Earth's tides and oceanic tides in Chinese continent. Based on 8 recent ocean tide models, the loading effects of ocean tides on the tidal gravity observations at Wuhan are simulated by means of integration of Green's functions. 63 tidal wave groups of the second-degree and 15 tidal wave groups of the third-degree are separated from the long-term gravity measurements of the SG C032. The third-degree tidal waves cover the diurnal, semidiurnal and terdiurnal tide frequency bands. The accuracy of tidal gravity observations is very high, and the standard deviation is 1.116 nm·s-2. The observations reflect the response of an anelastic Earth with no hydrostatic equilibrium to the second-degree and third-degree tide-generating forces. It is found that the international tidal gravity reference values at Wuhan station, determined in 2000, are extremely accurate in the semidiurnal tide band, but significantly discrepant and should be refined in the diurnal tide band. For the geodetic measurements in Chinese continent, the theoretical model for the Earth's tides, developed by Dehant et al in 1999 in which the anelasticity and no hydrostatic equilibrium of the Earth were taken into account, or the global experimental model for gravity tides, developed by Xu et al in 2004 based on the tidal gravity observations from the superconducting gravimeters in a world-wide network, can be chosen as reference and correction model. For the loading effects of ocean tides the ocean tide model Nao99 should be chosen. |
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| Keywords: | Superconducting gravimeter Gravimetric parameters International tidal gravity reference values at Wuhan station Earth's tide model Ocean tide model |
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