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| DOI | 10.1029/2019JC016031 |
| A Spectrally Consistent Globally Defined Geodetic Mean Dynamic Ocean Topography | |
| Siegismund F. | |
| 发表日期 | 2020 |
| ISSN | 21699275 |
| 卷号 | 125期号:7 |
| 英文摘要 | The space-borne geodetic temporal mean dynamic topography (MDT) is obtained from the difference of altimetric mean sea surface (MSS) h and the geoid height N. With the geostrophic surface currents obtained from its gradient, the MDT is an essential parameter when describing the ocean dynamics. Spectral consistency of h and N is crucial to minimize MDT errors. Frequently, h is globalized to allow for a spherical harmonic analysis, and small scales beyond maximum degree and order (d/o) resolved in the geoid are cut off. However, common globalization causes ocean-land steps in h−N and spectral inconsistencies of N and h over land. To overcome both issues, a methodology is proposed based on globalization of the MDT. A Laplacian smoother with the coastal MDT values as boundary condition is applied, resulting in a smooth surface over land and a continuous ocean-land transition. The new methodology strongly reduces Gibbs effects and the need to work with high-resolution MDTs to minimize them. Reduction of resolution is tested to reduce MDT uncertainties caused by the commission error expected to increase with decreasing scale. Applying drifter data and a high-resolution hydrodynamic ocean model, it is shown that for the Gulf Stream and the Kuroshio, geodetic MDTs applying recent combined geoid models contain physical information up to at least d/o 420 (48-km spatial scale). For oceanic regions with strong geoid gradients, a higher-resolution MDT might be needed to prevent Gibbs effects caused by remaining inconsistencies between the geoid and the MSS. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | altimetry; geoid; Gibbs effect; Mean Dynamic Topograhy; spectral consistency |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Oceans
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/186792 |
| 作者单位 | Inst. Astr. & Phys.Geodesy, Technische Universität München, Munich, Germany |
| 推荐引用方式 GB/T 7714 | Siegismund F.. A Spectrally Consistent Globally Defined Geodetic Mean Dynamic Ocean Topography[J],2020,125(7). |
| APA | Siegismund F..(2020).A Spectrally Consistent Globally Defined Geodetic Mean Dynamic Ocean Topography.Journal of Geophysical Research: Oceans,125(7). |
| MLA | Siegismund F.."A Spectrally Consistent Globally Defined Geodetic Mean Dynamic Ocean Topography".Journal of Geophysical Research: Oceans 125.7(2020). |
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