Three-dimensional numerical simulation of M2 internal tides in the East China Sea -: art. no. C04027
Three-dimensional numerical simulation of M2 internal tides in the East China Sea -: art. no. C04027
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DOI：
10.1029/2003jc001923
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发表时间：
2004-04-27
影响因子：
3.6
通讯作者：
Hibiya, T
中科院分区：
文献类型：
--
作者：
Niwa, Y;Hibiya, T
[1]东海及邻近海域是世界各大洋中M-2内潮最重要的生成区之一。本文利用三维数值模式研究了东海陆架边缘M-2内潮的分布和能量特征。数值试验表明，在巴士/吕宋海峡和吐噶喇海峡的次表层海脊、沿着琉球岛链的海脊和东海陆架斜坡等显著地形上，M-2内潮都能有效地产生，其中巴士/吕宋海峡的次表层海脊尤为明显。所有这些地形特征的特点是陡峭的斜坡在温跃层的深度上的M-2正压潮汐几乎是正常的事件。M-2内潮传播远离这些多个源区域相互干扰，创造一个复杂的波型。结果表明，M-2内潮的计算结果与TOPEX/Poseidon高度计观测结果吻合较好。在整个分析的模式区域内，M-2正压能量到斜压能量的转换率估计为35 GW。大约有10%的能量在M-2的表面潮汐事件的突出的地形特征转换为M-2内潮，虽然约有一半的M-2内潮能量是受本地耗散在发电站附近。
[1] The East China Sea and adjacent seas are one of the most significant generation regions of the M-2 internal tide in the world's oceans. In the present study, we investigate the distribution and energetics of the M-2 internal tide around the continental shelf edge in the East China Sea using a three-dimensional numerical model. The numerical experiment shows that M-2 internal tides are effectively generated over prominent topographic features such as the subsurface ridges in the Bashi/Luzon and Tokara Straits, the ridges along the Ryukyu Island chain, and the continental shelf slope in the East China Sea, the former particularly so. All of these topographic features are characterized by steep slopes at the depth of the thermocline onto which the M-2 barotropic tide is almost normally incident. The M-2 internal tides propagating away from these multiple source regions interfere with each other to create a complicated wave pattern. It is found that the calculated pattern of the M-2 internal tide agrees well with TOPEX/Poseidon altimeter observations. The conversion rate from M-2 barotropic to baroclinic energy over the whole analyzed model domain is estimated to be 35 GW. Roughly 10% of the energy in the M-2 surface tide incident on the prominent topographic features is converted to the M-2 internal tide, although about half of the M-2 internal tidal energy is subject to local dissipation in close proximity to the generation sites.