| 摘要: |
| 在对T/P卫星4年1992年10月–1996年10月测高数据的编辑及预处理基础上，采用stacking处理技术构造出中国近海及邻域（0°–40°N，105°–135°E）相对于GRS80参考椭球的30'×30'年平均海平面，其总体精度达到±8.3cm（均方根）水平。验证了中国近海及邻域的平均海平面在总体上呈东南高、西北低的趋势。利用JGM-3和OSU91A混合模型的重力大地水准面，直接从平均海平面中扣除大地水准面起伏的影响，并采用“剪切”法得到中国近海及邻域完整到20阶次的海面地形模型的球谐函数表达式，验证了中国近海及邻域海面地形在总体上为正的格局，并对其构造特征作了初步探讨。 |
| 关键词: T／P测高资料 平均海平面 海面地形 中国近海及邻域 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金重点项目，49634140号 |
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| DETERMINATION OF MEAN SEA SURFACE AND SEA SURFACE TOPOGRAPHY OF THE SEAS ADJACENT TO CHINA FROM T/P ALTIMETER DATA |
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WANG Hai-ying, LU Yang, XU Hou-ze, WANG Guang-yun
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Laboratory of Dynamic Geodesy, Institute of Geodesy & Geophysics,The Chinese Academy of deiences, Wuhan, 430077
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| Abstract: |
| In this paper, four-year (1992-10–1996-10) altimeter data from Topex / Poseidon (T/P) satellite over the Seas adjacent to China (0°–40°N，105°–135°E) are analyzed and preprocessed to eliminate the gross errors in the altimeter data and the affections of geophysical environment. Then they are used to determine a 30' × 30' mean sea surface relative to GRS80 Reference Ellipsoid with the stacking method, i.e. the collinear tracks of T/P satellite are stacked at “normal points” to product the mean tracks. The stacking procedure provides a significant compression of the original raw data and allows us to neglect the influence of various instantaneous oceanographic phenomena. The result of a cross-over analysis shows that the precision of the mean sea surface is ±8.3cm (RMS). In order to determine the sea surface topography, we employ a straight-forward method, i.e. the contributions of the hybrid geoid model combined by the JGM-3 and the OSU91A geopotential models are deducted from the mean sea surface. Then a “tailored” method is adopted to determine the spherical harmonics coefficients of the sea surface topography of the region whose degree and order is up to 20. The trend of “southeast high and northwest low” can be seen clearly from the mean sea surface in the region, and it also can be seen that the sea surface topography is positive. |
| Key words: T/P altimeter data, Mean sea surface, Sea surface topography, The seas adjacent to china |
