A high resolution satellite‐only GRACE‐based mean dynamic topography of the South Atlantic Ocean
A high resolution satellite‐only GRACE‐based mean dynamic topography of the South Atlantic Ocean
复制标题
基于 GRACE 的南大西洋高分辨率卫星平均动态地形
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Chambers
中科院分区：
文献类型：
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作者：
M. Vianna;V. Menezes;D. Chambers
提出了一种基于奇异谱分析的滤波方法，用于从GSFCMSS 00平均海面数据中提取由GGM 02 GRACE重力模型差分得到的高分辨率（0.25 ° × 0.25 °网格）的纯卫星平均动力海洋地形（MDT）。这种数据自适应插值型滤波器适用于有限域MDT处理，因为它最大限度地减少了平滑并且不会丢失边界点。它被应用于计算两个新的MDT和MDT导出的南大西洋地区从15 ° N到50 ° S的平均地转环流图。与Rio ‐ 2005、Chambers ‐ Zlotnicki ‐ 2004和ADCP巡航样带数据相比，阐明了这些新地图的优势。
A new filtering method based on Singular Spectrum Analysis has been devised to extract high resolution (0.25° × 0.25° grid) satellite‐only Mean Dynamic Ocean Topography(MDT) constructed by differencing of the GGM02 GRACE Gravity Model from the GSFCMSS00 Mean Sea Surface. This data‐adaptive interpolation‐type filter is adequate for the finite domain MDT processing since it minimizes smoothing and does not lose boundary points. It is applied to the computation of two new MDTs and MDT‐derived mean geostrophic circulation maps of the South Atlantic region from 15°N to 50°S. Advantages of these new maps are clarified when contrasted with the Rio‐2005, Chambers‐Zlotnicki‐2004 and ADCP cruise transect data.