Estimating the sea surface dynamic topography from Geosat altimetry data
Estimating the sea surface dynamic topography from Geosat altimetry data
复制标题
根据地球卫星测高数据估计海面动态地形
DOI：
10.1007/bf02236532
复制
发表时间：
1996
影响因子：
2.3
通讯作者：
S. Imawaki
中科院分区：
文献类型：
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作者：
K. Ichikawa;S. Imawaki
将最优内插方法应用于地球卫星测高数据，以消除轨道误差，并将时间平均海面动态地形(SSDT)从平均附近的时间波动中分离出来。与传统的共线方法相比，该方法降低了长波海洋信号在轨道误差中的损失，但仍将研究域上的面平均高度作为轨道误差剔除。利用日本岛屿验潮站的海平面数据对SSDT的波动进行了定量评估。用气候学月平均SSDT确定的面平均高度的季节变化来补偿平面平均高度的损失时，两个海平面变化的相关系数为0.83。此外，通过估算的时间平均SSDT验证了Seasat测高数据和水文数据相结合对大地水准面模型的改进。在存在与Seasat任务同时存在的水文数据的局部地区，大地水准面模型已得到显著改进，从而可以由测高数据和大地水准面模型相结合确定绝对SSDT；绝对SSDT很好地描述了日本以南黑潮准静止大弯曲的开始事件。然而，在这个局部区域之外，改进的大地水准面模型仍然存在几十厘米的误差。
Optimal interpolation method is applied to Geosat altimetry data both to remove orbit error and to separate temporal mean sea surface dynamic topography (SSDT) from temporal fluctuations around the mean. Loss of long-wavelength oceanic signals at orbit error reduction procedure is smaller in this method than that in conventional collinear methods, but the areal average height over the study domain is still removed as the orbit error. The fluctuation SSDT is quantitatively evaluated by sea level data from tide gauge stations at Japanese islands. The correlation coefficient of the two sea-level variations is 0.83 when the loss of the areal average is compensated by the seasonal variation of the areal average height determined from the climatological monthly-mean SSDT. In addition, the improvement of the geoid model by combined use of Seasat altimetry data and hydrographic data is validated through the estimated temporal mean SSDT. In a local area where hydrographic data contemporary with the Seasat mission exist, the geoid model has been significantly improved so that the absolute SSDT can be determined from combination of the altimetry data and geoid model; the absolute SSDT describes the onset event of a quasi-stationary large meander of the Kuroshio south of Japan very well. Outside this local area, however, errors of several tens of centimeters still remain in the improved geoid model.
S. Imawaki：“通过最佳插值从卫星测高数据绘制平均海面高程场”J. Geophys。
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