Observations of semidiurnal M-2 internal tidal parametric subharmonic instability in the northeastern South China Sea
文献类型：期刊论文
| 作者 | Liu Qian; Shang Xiaodong1,4; Xie Xiaohui2 |
| 刊名 | JOURNAL OF OCEANOLOGY AND LIMNOLOGY
 |
| 关键词 | internal tides South China Sea (SCS) resonant interactions rotary spectra parametric subharmonic instability |
| ISSN号 | 2096-5508 |
| 英文摘要 | Near-diurnal vertically-standing waves with high vertical wavenumbers k(z) were observed in the velocity and shear fields from a set of 75-d long ADCP moored in the northeastern South China Sea (SCS) away from the "critical" latitude of 28.8 degrees. These enhanced near-diurnal internal waves followed a fortnightly spring-neap cycle. However, they always happened during semidiurnal spring tides rather than diurnal springs although strong diurnal internal tides with the fortnightly spring-neap cycle were prevailing, suggesting that they were generated via subharmonic instability (PSI) of dominant semidiurnal M-2 internal tides. When two semidiurnal internal tidal waves with opposite vertical propagation direction intersected, both semidiurnal subharmonic and super harmonic waves were largely intensified. The observed maximum diurnal velocity amplitudes were up to 0.25 m/s. The kinetic energy and shear spectra further suggested that frequencies of daughter waves were not always perfectly equal to M-2/2. The superposition of two daughter waves with nearly equal frequencies and nearly opposite k(z) in a PSI-triad leaded to the vertically-standing waves. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18338]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 作者单位 | 1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China 3.Minist Nat Resources, State Key Lab Satellite Ocean Environm Dynam, Inst Oceanog 2, Hangzhou 310000, Peoples R China 4.Jiangsu Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Zhenjiang 212003, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Qian,Shang Xiaodong,Xie Xiaohui. Observations of semidiurnal M-2 internal tidal parametric subharmonic instability in the northeastern South China Sea[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY. |
| APA | Liu Qian,Shang Xiaodong,&Xie Xiaohui. |
| MLA | Liu Qian,et al."Observations of semidiurnal M-2 internal tidal parametric subharmonic instability in the northeastern South China Sea".JOURNAL OF OCEANOLOGY AND LIMNOLOGY |
入库方式： OAI收割
来源：南海海洋研究所
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