全球海洋重力场模型的研究进展及展望

Research progress and prospect of global marine gravity field model

为了探究海洋重力场反演的影响因素,首先回顾了海洋重力场反演的发展进程,通过比较3种主要海洋重力场方法的优缺点并进行区域实用性分析得出最优的方法。其次详细阐述SS系列和KMS-DNSC-DTU系列海洋重力场模型的发展历程。通过新旧模型参数对比分析表明:SS系列早期模型分辨率较高,目前两系列模型分辨率都达到1′×1′;KMS-DNSC-DTU系列模型精度更新较快,DTU17模型精度相比于V24.1模型精度更加接近1 mGal。同时,概述了相应重力场模型在不同区域进行测试的结果,对比分析并得到了影响模型精度的区域差异性因素。最后对卫星测高获取全球海洋重力场模型的前景进行了展望。

To explore the intluence factors ot marine gravity lield,the development process ot the marine gravity field recovery was reviewed firstly.The advantages and disadvantages of the three main methods of the marine gravity field were compared and the optimal method was obtained by the regional practical analysis.Secondly.the development history of the marine gravity field models including the sS and the KMS-DNSC-DTU were elaborated in detail.The comparison between the old and new model parameters showed that the resolution of the early SS models was higher.At present,the resolution of the two series models reaches 1′×1′;the accuracy of the KMS DNSC-DTU models was updated rapidly,and the accuracy of DTU17 model was closer to 1 mGal compared with V24.1 model.Moreover,the test results of the corresponding gravity field model in different regions were summarized,and the regional difference factors affecting the model accuracy were obtained by the comparative analysis.Thirdly,the prospects of the global marine gravity field model obtained by satellite altim etry were discussed and analyzed.