The variability of internal tides in the Northern South China Sea
The variability of internal tides in the Northern South China Sea
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DOI：
10.1007/s10872-013-0198-0
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发表时间：
2013-08
影响因子：
2.3
通讯作者：
Barry B. Ma;R. Lien;D. Ko
中科院分区：
文献类型：
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作者：
Barry B. Ma;R. Lien;D. Ko
在南海北方大陆坡强内潮的传播路径上布设了3个底装ADCP系泊装置，历时近1年。这些速度测量被用来研究在该地区的昼夜和半日内潮汐能的年内变化。利用美国海军研究实验室开发的吕宋海峡海洋临近预报系统（Luzon Strait Ocean Nowcast/Forecast System）数值模式（覆盖南海北方和黑潮），对东沙陆坡内潮能的观测变化进行了解释。内潮主要产生于吕宋海峡的两个海底洋脊。在西脊生成点，内潮向西的能量通量对黑潮的层结和等密度线斜率敏感。黑潮锋的水平切变并不改变全日潮和半日潮的传播路径，因为吕宋海峡黑潮的相对涡度不足以使内潮的有效惯性频率增加到固有频率。南海北方潮束传播的变化可归因于陆坡和东沙高原内潮能的变化。
An array of three bottom-mounted ADCP moorings was deployed on the prevailing propagation path of strong internal tides for nearly 1 year across the continental slope in the northern South China Sea. These velocity measurements are used to study the intra-annual variability of diurnal and semidiurnal internal tidal energy in the region. A numerical model, the Luzon Strait Ocean Nowcast/Forecast System developed at the U.S. Naval Research Laboratory that covers the northern South China Sea and the Kuroshio, is used to interpret the observed variation of internal tidal energy on the Dongsha slope. Internal tides are generated primarily at the two submarine ridges in the Luzon Strait. At the western ridge generation site, the westward energy flux of the diurnal internal tide is sensitive to the stratification and isopycnal slope associated with the Kuroshio. The horizontal shear at the Kuroshio front does not modify the propagation path of either diurnal or semidiurnal tides because the relative vorticity of the Kuroshio in Luzon Strait is not strong enough to increase the effective inertial frequency to the intrinsic frequency of the internal tides. The variation of internal tidal energy on the continental slope and Dongsha plateau can be attributed to the variation in tidal beam propagation in the northern South China Sea.