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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >AN OCEANOGRAPHIC ASSESSMENT OF THE PRELIMINARY GOCE GEOID MODELS ACCURACY
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AN OCEANOGRAPHIC ASSESSMENT OF THE PRELIMINARY GOCE GEOID MODELS ACCURACY

机译：初步的GOCE大地水准面模型准确性的海洋学评估

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摘要

In the framework of the ESA HPF (HighrnProcessing Facility), a number of gravity models havernbeen computed from the GOCE data since thernbeginning of the mission in 2009. In addition to thernclassical method (the so-called direct approach) thatrncombines orbit and gravity modelling using the orbitrnperturbation theory, two alternative methods have beenrnnewly developed dedicated to the GOCE mission, i.e.rnthe time-wise and the space-wise approaches. Also,rnafter preliminary models based on 71 days of GOCErndata were delivered in June 2010, new models havernbeen made available recently, based on more than sixrnmonths of data.rnIn the framework of the ESA GUT (GOCErnUser Toolbox) project, the accuracy of these differentrnmodels for oceanographic application has beenrnassessed. Both the impact of the different methodolgiesrnused to compute the gravity field as well as therncontribution of the four months of supplementary datarnhave been checked.rnFor that purpose, the different GOCE geoidsrnwere used to determine the ocean MDT (MeanrnDynamic Topography) which was subsequentlyrncompared with other MDT estimates derived usingrnother geoid models or in-situ oceanographic data. ThernMDT comparisons were carried out by analysing MDTrnresiduals as well as their associated geostrophic surfacerncurrents at different maximum harmonic. Finally, bothrnglobal and regional assessments have been performed.
机译：在ESA HPF（高处理设施）的框架中，自2009年任务开始以来，已经从GOCE数据中计算出了许多重力模型。除了经典方法（所谓的直接方法）之外，该方法还结合了使用轨道和重力建模的方法在轨道扰动理论中，专门针对GOCE任务开发了两种替代方法，即时间方法和空间方法。此外，在基于GOCErndata的71天的初步模型于2010年6月交付之后，基于六个多月的数据，最近已经提供了新模型。在ESA GUT（GOCErnUser Toolbox）项目的框架中，这些不同模型的准确性用于海洋学的应用已经过评估。已经检查了用于计算重力场的不同方法的影响以及四个月的补充数据的贡献。为此，使用了不同的GOCE大地水准面来确定海洋MDT（平均动态地形），随后将其与其他MDT进行了比较。使用其他大地水准面模型或原位海洋学数据得出的估计值。通过分析不同最大谐波下的MDTrn残差及其相关的地转表面电流来进行MDT比较。最后，已经进行了全球和区域评估。

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