Measuring the Kuroshio Current with ocean acoustic tomography.
Measuring the Kuroshio Current with ocean acoustic tomography.
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DOI：
10.1121/1.4818842
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
N. Taniguchi;Chen-Fen Huang;A. Kaneko;Cho‐Teng Liu;B. Howe;Yu-Huai Wang;Yih Yang;Ju Lin;
中科院分区：
文献类型：
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作者：
N. Taniguchi;Chen-Fen Huang;A. Kaneko;Cho‐Teng Liu;B. Howe;Yu-Huai Wang;Yih Yang;Ju Lin;
2009年8月20日至9月15日，利用海洋声学层析法（OAT）在台湾东南部黑潮海域进行了海流剖面测量。声脉冲在两个声学站之间连续传输，这两个声学站位于水下声道轴线附近，相距48公里。基于射线模拟的结果，接收信号被划分为多个射线组，因为难以分辨单个射线的射线到达。这些射线组的平均差分旅行时被用来重建电流的垂直剖面。通过两种方法估计最深水层的电流：显式解和正则化反演。强海流仅限于上层200 m，向500 m深处迅速减弱。这两种方法给出了类似的结果，并与船载声学多普勒海流剖面仪的结果在150米以上是一致的。观测到的时间变化表现出类似的趋势，从混合坐标海洋模式的预测。
Ocean current profiling using ocean acoustic tomography (OAT) was conducted in the Kuroshio Current southeast of Taiwan from August 20 to September 15, 2009. Sound pulses were transmitted reciprocally between two acoustic stations placed near the underwater sound channel axis and separated by 48 km. Based on the result of ray simulation, the received signals are divided into multiple ray groups because it is difficult to resolve the ray arrivals for individual rays. The average differential travel times from these ray groups are used to reconstruct the vertical profiles of currents. The currents are estimated with respect to the deepest water layer via two methods: An explicit solution and an inversion with regularization. The strong currents were confined to the upper 200 m and rapidly weakened toward 500 m in depth. Both methods give similar results and are consistent with shipboard acoustic Doppler current profiler results in the upper 150 m. The observed temporal variation demonstrates a similar trend to the prediction from the Hybrid Coordinate Ocean Model.