| 基于Grace月重力场模型的稳态地球重力场模型分析 |
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| 引用本文： | 柯宝贵,章传银,张利明.基于Grace月重力场模型的稳态地球重力场模型分析[J].海洋测绘,2012(2):4-6. |
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| 作者姓名： | 柯宝贵 章传银 张利明 |
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| 作者单位： | 中同测绘科学研究院,北京100830 |
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| 基金项目： | 国家高技术研究发展计划项目（2009AA121405 2009AA121402）; 国家自然科学基金项目（40974016 41004004 41104006） |
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| 摘 要： | 基于106个月的Grace（gravity recovery and climate experiment）月重力场模型（120阶次）,消除了月重力场的月、季度及年度变化,得到了稳态的地球重力场模型（Grace_sta）。在2～120阶次之间,Grace_sta与已有高阶重力场EGM2008及EGM96三个模型的阶方差是一致的。在2～100阶次之间,Grace_sta模型误差阶方差要小于EGM2008与EGM96误差阶方差。在全球范围内,Grace_sta重力场的大地水准面与EGM2008相应阶次的大地水准面标准差约为3cm,与EGM96模型大地水准面差异则高达52cm。结果表明,Grace_sta足可以取代EGM2008重力场模型2～100阶次的低阶部分,新得到的稳态重力场模型可为海面地形分析提供了可靠的参考场。
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| 关 键 词： | Grace 地球重力场 EGM2008 EGM96 |
Stable Analysis on the Monthly GRACE Gravity Model |
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| KE Baogui,ZHANG Chuanyin,ZHANG Liming.Stable Analysis on the Monthly GRACE Gravity Model[J].Hydrographic Surveying and Charting,2012(2):4-6. |
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| Authors: | KE Baogui ZHANG Chuanyin ZHANG Liming |
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| Institution: | (Chinese Academy of Surveying and Mapping,Beijing 100830,China) |
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| Abstract: | A stable earth gravity model with high precision（Grace_sta）was obtained based on 106 months continual Grace（gravity recovery and climate experiment）model,whose spherical harmonic degree and order was 120,after eliminating the monthly,quarterly and annual variations.Among the degree 2~120,the degree variance curve of Grace_sta model was consistent with the EGM2008 and EGM96.But the error degree variance of the former was better than the latter two models between the degree 2 to 100.The geoid undulation of the Grace_sta model has RMS 3cm compared with EGM2008,and about 52cm compared with EGM96 all over the world,which they were only using the earth gravity coefficients until 100 degree and order.The results showed that lower part of the EGM2008 model could be substituted by the new derived stable earth gravity model Grace_sta.This new model can be used as a reasonable reference gravity field for deriving high precision sea surface topography. |
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| Keywords: | Grace earth gravity model EGM2008 EGM96 |
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