多源数据推求的西太平洋区域海面动力地形比较分析

Comparative Analysis of the Dynamic Ocean Topography Over the Western Pacific Derived From Multi-Source Data

简述利用空间大地测量观测数据和海洋水文数据推求海面动力地形的方法。基于EGM96重力场模型和卫星重力恢复的重力场模型GL04C,联合卫星测高平均海面高模型分别推算西太平洋海域的平均海面动力地形,并与根据海洋水文数据推算之结果进行比较分析。结果表明:卫星重力场模型GL04C更好地表现了海面地形的细节特征。卫星重力和卫星测高的联合应用将成为确定海面动力地形的有效途径之一。

Methods for estimating the dynamic ocean topography （DOT） using space geodesy observational data and ocean hydrological data were presented briefly. Combining a sea surface height model （KMSS04）, two mean DOT models over the western Pacific are calculated separately based on the EGM96 gravity field model and GL04C model recovered from satellite gravimetry data. Comparisons of these two DOT models derived from altimetry and geoid with a DOT model from WOA01 data show that the DOT model from EIGEN-GL04C displays more details than the others. Joint applications of satellite gravity and satellite altimetry will be one of the most important approaches to determine the DOT.