| 南海东北部内潮的模态结构和传播 |
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| 引用本文： | 刘倩,谢晓辉,尚晓东,陈桂英,汪宏.南海东北部内潮的模态结构和传播[J].海洋学报(英文版),2019,38(9):12-23. |
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| 作者姓名： | 刘倩 谢晓辉 尚晓东 陈桂英 汪宏 |
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| 作者单位： | 船舶与海洋工程学院, 江苏科技大学, 镇江 212003, 江苏, 中国;热带海洋环境国家重点实验室, 南海海洋研究所, 中国科学院, 广州 510301, 中国,卫星海洋环境动力学国家重点实验室, 第二海洋研究所, 国家海洋局, 杭州, 310012, 中国,热带海洋环境国家重点实验室, 南海海洋研究所, 中国科学院, 广州 510301, 中国,热带海洋环境国家重点实验室, 南海海洋研究所, 中国科学院, 广州 510301, 中国,船舶与海洋工程学院, 江苏科技大学, 镇江 212003, 江苏, 中国 |
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| 基金项目： | The State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences under contract No. LTO1915; the National Natural Science Foundation of China under contract Nos 41630970, 41876016, 41676022 and 41521005; the Instrument Developing Project of the CAS under contract No. YZ201432. |
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| 摘 要： | The evolution of energy, energy flux and modal structure of the internal tides(ITs) in the northeastern South China Sea is examined using the measurements at two moorings along a cross-slope section from the deep continental slope to the shallow continental shelf. The energy of both diurnal and semidiurnal ITs clearly shows a～14-day spring-neap cycle, but their phases lag that of barotropic tides, indicating that ITs are not generated on the continental slope. Observations of internal tidal energy flux suggest that they may be generated at the Luzon Strait and propagate west-northwest to the continental slope in the northwestern SCS. Because the continental slope is critical-supercritical with respect to diurnal ITs, about 4.6 kJ/m~2 of the incident energy and 8.7 kW/m of energy flux of diurnal ITs are reduced from the continental slope to the continental shelf. In contrast, the semidiurnal internal tides enter the shelf because of the sub-critical topography with respect to semidiurnal ITs.From the continental slope to the shelf, the vertical structure of diurnal ITs shows significant variation, with dominant Mode 1 on the deep slope and dominant higher modes on the shelf. On the contrary, the vertical structure of the semidiurnal ITs is stable, with dominant Mode 1.
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| 关 键 词： | 南海 内潮 传播 散射 模态结构 |
| 收稿时间： | 2018/8/21 0:00:00 |
Modal structure and propagation of internal tides in the northeastern South China Sea |
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| LIU Qian,XIE Xiaohui,SHANG Xiaodong,CHEN Guiying and WANG Hong.Modal structure and propagation of internal tides in the northeastern South China Sea[J].Acta Oceanologica Sinica,2019,38(9):12-23. |
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| Authors: | LIU Qian XIE Xiaohui SHANG Xiaodong CHEN Guiying and WANG Hong |
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| Abstract: | The evolution of energy, energy flux and modal structure of the internal tides (ITs) in the northeastern South China Sea is examined using the measurements at two moorings along a cross-slope section from the deep continental slope to the shallow continental shelf. The energy of both diurnal and semidiurnal ITs clearly shows a~14-day spring-neap cycle, but their phases lag that of barotropic tides, indicating that ITs are not generated on the continental slope. Observations of internal tidal energy flux suggest that they may be generated at the Luzon Strait and propagate west-northwest to the continental slope in the northwestern SCS. Because the continental slope is critical-supercritical with respect to diurnal ITs, about 4.6 kJ/m2 of the incident energy and 8.7 kW/m of energy flux of diurnal ITs are reduced from the continental slope to the continental shelf. In contrast, the semidiurnal internal tides enter the shelf because of the sub-critical topography with respect to semidiurnal ITs. From the continental slope to the shelf, the vertical structure of diurnal ITs shows significant variation, with dominant Mode 1 on the deep slope and dominant higher modes on the shelf. On the contrary, the vertical structure of the semidiurnal ITs is stable, with dominant Mode 1. |
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| Keywords: | South China Sea internal tides propagation scattering modal structure |
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