Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea
文献类型：CNKI期刊论文
| 作者 | YANG Bing ; HOU Yijun
|
| 发表日期 | 2014-11-15 |
| 出处 | Acta Oceanologica Sinica
 |
| 关键词 | near-inertial waves,South China Sea,Typhoon Nesat |
| 英文摘要 | In September 2011, Typhoon Nesat passed over a moored array of instruments recording current and temperature in the northern South China Sea(SCS). A wake of baroclinic near-inertial waves(NIWs) commenced after Nesat passed the array. The associated near-inertial currents are surface-intensified and clockwise-polarized. The vertical range of NIWs reached 300 m, where the vertical range is defined as the maximum depth of the horizontal near-inertial velocity 5 cm/s. The current oscillations have a frequency of 0.709 9 cycles per day(cpd), which is 0.025 f higher than the local inertial frequency. The NIWs have an e-folding time-scale of 10 d based on the evolution of the near-inertial kinetic energy. The depth-leading phase of near-inertial currents indicates downward group velocity and energy flux. The estimated vertical phase velocity and group velocity are 0.27 and 0.08 cm/s respectively, corresponding to a vertical wavelength of 329 m. A spectral analysis reveals that NIWs act as a crucial process to redistribute the energy injected by Typhoon Nesat. A normal mode and an empirical orthogonal function analysis indicate that the second mode has a dominant variance contribution of 81%, and the corresponding horizontal phase velocity and wavelength are 3.50 m/s and 420 km respectively. The remarkable large horizontal phase velocity is relevant to the rotation of the earth, and a quantitative analysis suggests that the phase velocity of the NIWs with a blue-shift of 0.025 f overwhelms that of internal gravity waves by a factor of 4.6. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | The National Natural Science Foundation of China under contract Nos U1133001,41030855 and 41376027 ; the National High Technology Research and Development Program(863 Program)of China under contract No.2013AA09A502 |
| 卷 | v.33期:11页:104-113 |
| 语种 | 英文; |
| 分类号 | P732 |
| ISSN号 | 0253-505X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190233]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.InstituteofOceanology,ChineseAcademyofSciences 2.KeyLaboratoryofChineseAcademyofSciencesforOceanCirculationandWaves,InstituteofOceanology 3.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | YANG Bing,HOU Yijun. Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea. 2014. |
入库方式： OAI收割
来源：海洋研究所
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