| 由PREM模型参数计算地球自转的周期变化 |
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| 引用本文： | 萧耐园,成灼.由PREM模型参数计算地球自转的周期变化[J].天文学报,1997,38(4):370-378. |
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| 作者姓名： | 萧耐园 成灼 |
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| 作者单位： | 南京大学天文系!南京，210093，南京大学天文系!南京，210093，中国科学院紫金山天文台!南京，210008 |
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| 摘 要： | 弹性地球在日月引潮力势作用下的形变引起其转动惯量的改变，从而导致地球自转速率的变化．本文利用PREM地球模型所给的物质密度和弹性等参数分布．计算日月引潮力势产生的地球形变附加势，进而计算转动惯量的变化．最后得到一系列包含周期同引潮势带谐项、振幅大于1微秒的自转速率周期变化系数．
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| 关 键 词： | 地球自转变化 地球模型 形变附加势 日月带谐潮 |
PERIODIC VARIATIONS OF THE EARTH ROTATION CALCULATED WITH THE PREM PARAMETERS |
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| Xiao Nai-yuan, Xia Yi-fei.PERIODIC VARIATIONS OF THE EARTH ROTATION CALCULATED WITH THE PREM PARAMETERS[J].Acta Astronomica Sinica,1997,38(4):370-378. |
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| Authors: | Xiao Nai-yuan Xia Yi-fei |
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| Abstract: | The deformation of an elastic Earth due to effects of the luni-solar tide-generatingpotential causes changes of its spin momentum and then variations of the Earthrotation. With the rheological parameters given by the PREM model, the tidalpotential of the Earth and the changes of its spin momentum are calculated. Theperiodic variations of the Earth rotation due to the zonal tides in form of a set ofcoefficients with each quantity larger than 1us are obtaned. |
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| Keywords: | variations of the Earth rotation Earth model tidal potential of the Earth luni-solar zonal tides |
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