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首页> 外文期刊>Journal of Geodesy >A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model
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A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model

机译：使用初步GOCE重力模型的全球平均动态地形和海洋环流估算

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The Gravity and steady-state Ocean Circulation Explorer (GOCE) satellite mission measures Earth's gravity field with an unprecedented accuracy at short spatial scales. In doing so, it promises to significantly advance our ability to determine the ocean's general circulation. In this study, an initial gravity model from GOCE, based on just 2 months of data, is combined with the recent DTU10MSS mean sea surface to construct a global mean dynamic topography (MDT) model. The GOCE MDT clearly displays the gross features of the ocean's steady-state circulation. More significantly, the improved gravity model provided by the GOCE mission has enhanced the resolution and sharpened the boundaries of those features compared with earlier satellite only solutions. Calculation of the geostrophic surface currents from the MDT reveals improvements for all of the ocean's major current systems. In the North Atlantic, the Gulf Stream is stronger and more clearly defined, as are the Labrador and the Greenland currents. Furthermore, the finer scale features, such as eddies, meanders and branches of the Gulf Stream and North Atlantic Current system are visible. Similar improvements are seen also in the North Pacific Ocean, where the Kuroshio and its extension are well represented. In the Southern hemisphere, both the Agulhas and the Brazil-Malvin-as Confluence current systems are well defined, and in the Southern ocean the Antarctic Circumpolar Current appears enhanced. The results of this preliminary analysis, using an initial GOCE gravity model, clearly demonstrate the potential of the GOCE mission. Already, at this early stage of the mission, the resolution of the MDT has been improved and the estimated surface current speeds have been increased compared with a GRACE satellite-only MDT. Future GOCE gravity models are expected to build further upon this early success.
机译：重力和稳态海洋循环探索器（GOCE）卫星任务在短空间尺度上以前所未有的精度测量地球的重力场。这样，它有望大大提高我们确定海洋总体环流的能力。在这项研究中，仅基于两个月的数据，就将GOCE的初始重力模型与最新的DTU10MSS平均海面相结合，以构建全球平均动态地形（MDT）模型。 GOCE MDT清楚地显示了海洋稳态循环的主要特征。更重要的是，与早期的仅使用卫星的解决方案相比，GOCE任务提供的改进的重力模型提高了分辨率并锐化了这些特征的边界。根据MDT计算的地转表面水流揭示了海洋所有主要水流系统的改进。在北大西洋，墨西哥湾流以及拉布拉多和格陵兰洋流都更强，更清晰地定义。此外，还可以看到更细微的尺度特征，例如墨西哥湾流和北大西洋洋流系统的漩涡，曲折和分支。在北太平洋也有类似的改善，黑潮及其延伸得到了很好的体现。在南半球，Agulhas和巴西-Malvin-as汇流系统都得到了很好的定义，而在南洋，南极绕极流似乎有所增强。使用初始的GOCE重力模型进行的初步分析结果清楚地证明了GOCE任务的潜力。与仅使用GRACE卫星的MDT相比，在任务的早期阶段，MDT的分辨率已经得到改善，并且估计的地面电流速度已经提高。预计未来的GOCE重力模型将在此早期成功的基础上进一步发展。

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