New Altimetric Estimates of Mode-1 M2 Internal Tides in the Central North Pacific Ocean
New Altimetric Estimates of Mode-1 M2 Internal Tides in the Central North Pacific Ocean
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DOI：
10.1175/2009jpo3922.1
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发表时间：
2009-07
影响因子：
3.5
通讯作者：
Zhong‐Kuo Zhao;M. Alford
中科院分区：
文献类型：
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作者：
Zhong‐Kuo Zhao;M. Alford
摘要利用扩展的海洋地形实验（TOPEX）/海神（T/P）高度计数据集计算了模式1 M2内潮能量通量的新估计，该数据集包括原始和串联轨迹，将空间分辨率从O（500 km）提高到O（250 km）。此外，开发了一种新的技术，允许单独的分辨率向北和向南的组件。半波长的功能，以前看到的未分离的估计是由于向北和向南波列的叠加。新技术和更高的空间分辨率为研究北太平洋中部M2模式内潮提供了新的视角。与所有高度估计一样，由于航迹的重复周期很长，只有相干或锁相信号是可探测的。从特定的生成站点发出的内部潮汐束与数值模型的预测一致，1）窄至200公里，2）传播的距离比以前更长。
Abstract New estimates of mode-1 M2 internal tide energy flux are computed from an extended Ocean Topography Experiment (TOPEX)/Poseidon (T/P) altimeter dataset that includes both the original and tandem tracks, improving spatial resolution over previous estimates from O(500 km) to O(250 km). Additionally, a new technique is developed that allows separate resolution of northward and southward components. Half-wavelength features previously seen in unseparated estimates are shown to be due to the superposition of northward and southward wave trains. The new technique and higher spatial resolution afford a new view of mode-1 M2 internal tides in the central North Pacific Ocean. As with all altimetric estimates, only the coherent or phase-locked signals are detectable owing to the long repeat period of the tracks. Emanating from specific generation sites consistent with predictions from numerical models, internal tidal beams 1) are as narrow as 200 km and 2) propagate a longer distance than previously observ...