| 根据多卫星高度计海面高数据推算南中国海及菲律宾海域重力异常(英文) |
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| 作者单位： | Faculty of Civil and Geomatic Engineering，Kwame Nkrumah University of Science and Technology，Kumasi，Ghana. |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No. 40637034）, the National High Technology Research and Development Program of China（No. 2006AA12Z309, 2006AAO9Z138, 2007AA12Z346）. |
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| 摘 要： | t Gravity anomalies on a2.5 ×2.5 arc-minute grid in a non-tidal system were derived over the South China and Philippine Seas from multi-satellite altimetry data. North and east components of deflections of the vertical were computed from altimeter-derived sea surface heights at crossover locations, and gridded onto a 2.5 × 2.5 arc-minute resolution grid. EGM96-derived components of deflections of the vertical and gravity anomalies gridded into 2.5 × 2.5 arc-minute resolutions were then used as reference global geopotential model quantities in a remove-restore procedure to implement the Inverse Vening Meinesz formula via the 1D-FFT technique to predict the gravity anomalies over the South China and Philippine Seas from the gridded altimeter-derived components of deflections of the vertical. Statistical comparisons between the altimeter-derived and the shipboard gravity anomalies showed that there is a root-mean-square agreement of 5.7 mgals between them.
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| 关 键 词： | 多卫星高度计海面高数据 南中国海 菲律宾海域 重力异常 |
Prediction of gravity anomalies over the South China and Philippine Seas from multi-satellite altimeter sea surface heights |
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| Authors: | Isaac Dadzie Jiancheng Li Yonghai Chu |
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| Institution: | Isaac Dadzie, Faculty of Civil and Geomatic Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. |
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| Abstract: | Gravity anomalies on a 2.5 x 2.5 arc-minute grid in a non-tidal system were derived over the South China and Philippine Seas from multi-satellite altimetry data. North and east components of deflections of the vertical were computed from altimeter-derived sea surface heights at crossover locations, and gridded onto a 2.5 x 2.5 arc-minute resolution grid. EGM96-derived components of deflections of the vertical and gravity anomalies gridded into 2.5 x 2.5 arc-minute resolutions were then used as reference global geopotential model quantities in a remove-restore procedure to implement the Inverse Vening Meinesz formula via the 1D-FFT technique to predict the gravity anomalies over the South China and Philippine Seas from the gridded altimeter-derived components of deflections of the vertical. Statistical comparisons between the altime-ter-derived and the shipboard gravity anomalies showed that there is a root-mean-square agreement of 5.7 mgals between them. |
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| Keywords: | satellite altimetry sea surface heights deflections of the vertical gravity anomalies |
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