Evaluation of high‐frequency oceanographic signal in GRACE data: Implications for de‐aliasing
Evaluation of high‐frequency oceanographic signal in GRACE data: Implications for de‐aliasing
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GRACE 数据中高频海洋信号的评估：对去混叠的影响
DOI：
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发表时间：
2011
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：
J. Bonin;D. Chambers
最近的日分辨率GRACE数据集（ITG‐Grace2010）的次月部分通过与卫星测高测量的海平面变化的高频成分进行比较来评估海洋。本文还对GRACE数据处理中用于去除高频非潮汐海洋质量变化的当前大气和海洋去混叠（AOD）模式进行了评估。我们证明，基于OMCT的AOD模式不能充分代表非潮汐海洋质量变化的真实次月变化，但ITG‐Grace2010可以。差异并不小，这表明在未来的GRACE处理中，应该考虑使用新模型或从次月GRACE信息中提取的数据集进行去混叠。
The sub‐monthly portion of a recent daily‐resolution GRACE data set (ITG‐Grace2010) is evaluated over the ocean by comparing with the high‐frequency component of sea level variability measured by satellite altimetry. The current Atmosphere and Ocean De‐aliasing (AOD) model used to remove the high‐frequency non‐tidal ocean mass variations in GRACE data processing is also assessed. We demonstrate that the OMCT‐based AOD model does not adequately represent the true sub‐monthly variability in non‐tidal ocean mass variability, but that ITG‐Grace2010 does. The differences are not small, and indicate that a new model, or a data set derived from sub‐monthly GRACE information, should be considered for de‐aliasing in future GRACE processing.