GEOSAT卫星遥感资料研究南海海面动力高度场和地转流场
Sea surface dynamic topography and geostrophic current over the South China Sea from Geosat altimeter observation
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摘要: 利用GEOSAT卫星在1987年和1988年执行ERM任务的雷达高度计资料来分析获取南海海面动力高度偏差的季节分布.根据卫星轨道误差和海域的特点,提出了适用于内海及边缘海域的二维共线轨道校正法,由此方法而得出的南海海面动力高度偏差的季节分布表明,南海表层流场在夏季总的环流形势是反气旋式环流,而冬季是气旋式环流.分析的结果同海上常规调查资料的分析结果相比较表明,在海流季节变化信号较强的海区(如南海中部和北部海区),利用高度计资料能很好地反映该海区的海流季节变化特征.Abstract: Based on the Geosat altimetric data in 1987 and 1988, the distributions of seasonal anomaly of dynamical topography over the South China Sea are analysed. A two-dimensional collinear adjustment method is developed to reduce the calculation errors for the orbit height. The results give a general agreement to those from the in situ observations,especially over the northern area where the seasonal variations of the geostrophic circulation over the South China Sea are anticyclonic in summer, and are cyclonic in winter. It is shown that the altimeter data are efficient in deriving the seasonal variation features of geostrophic current over the South China Sea.
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Key words:
- Satellite altimeter /
- dynamic topography /
- collinear orbit adjustment
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