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LI Bingtian,CAO Anzhou,LV Xianqing. 2015. Three-dimensional numerical simulation of M2 internal tides in the Luzon Strait. Acta Oceanologica Sinica, 34(11):55-62
Three-dimensional numerical simulation of M2 internal tides in the Luzon Strait
吕宋海峡M2内潮的三维数值模拟
Received:March 19, 2015  Revised:May 28, 2015
DOI:10.1007/s13131-015-0748-y
Key words:internal tide  numerical simulation  Luzon Strait
中文关键词:  内潮  数值模拟  吕宋海峡
基金项目:The National High Technology Research and Development Program (863 Program) of China under contract Nos 2013AA122803 and 2013AA09A502; the National Natural Science Foundation of China under contract Nos 41206001 and 41371496; the National Science and Technology Support Program under contract No. 2013BAK05B04.
Author NameAffiliationE-mail
LI Bingtian Key Laboratory of Physical Oceanography, Ocean University of China, Ministry of Education, Qingdao 266100, China  
CAO Anzhou Key Laboratory of Physical Oceanography, Ocean University of China, Ministry of Education, Qingdao 266100, China  
LV Xianqing Key Laboratory of Physical Oceanography, Ocean University of China, Ministry of Education, Qingdao 266100, China xqinglv@ouc.edu.cn 
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Abstract:
      A three-dimensional isopycnic-coordinate internal tidal model is employed to investigate the generation, propagation, vertical structure and energy conversion of M2 internal tides in the Luzon Strait (LS) with mooring observations. Simulated results, especially the tidal current amplitudes, agree well with observations, demonstrating the reasonability and accuracy of the model. Results indicate that M2 internal tides mainly propagate into three directions horizontally, i.e., eastward towards the western Pacific Ocean, westward towards the Dongsha Island and southwestward towards the South China Sea Basin. In the horizontal direction, tidal current amplitudes decrease as distance increases away from the LS; in the vertical direction, they show an obvious decreasing tendency with depth. Between the double ridges of the LS, a clockwise gyre of M2 baroclinic energy flux appears, which is caused by reflections of M2 internal tides at supercritical topographies, and resonance of M2 internal tides happens along 19.5° and 21.5°N due to the heights and separation distance of the double ridges. The total energy conversion in the LS is about 14.20 GW.
中文摘要:
      本文利用一个三维密度坐标数值模型模拟了吕宋海峡的M2内潮,研究了它的生成、传播、垂向结构和转化率等特征.模拟结果,尤其是模拟的潮流振幅,与观测结果符合良好,表明了该模型的合理性和准确性.研究发现M2内潮水平方向传播主要有以下三条路径:向东进入西太平洋、向西至东沙群岛附近以及向西南方向传播进入南海.在水平方向上,离吕宋海峡越远,M2内潮的潮流振幅越小;而在垂向上,潮流振幅随着深度的增加而减小.由于M2内潮在超临界地形的反射,在吕宋海峡双脊之间会形成顺时针旋转的斜压能通量.受双脊高度和脊间距离的影响,M2内潮在19.5°至21.5°N产生共振.M2内潮在吕宋海峡能量转换约为14.20 GW.
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