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南海北部深层近惯性振荡信号研究
侯华千1, 于非1, 李彬2, 任强1, 魏传杰1
1.中国科学院海洋研究所;2.中国科学院沈阳自动化研究所
摘要:
本研究通过分析布放在南海北部的着陆器流速数据,对一支蓝移的近惯性振荡信号进行研究,发现该信号可以传到600米水深以下,持续时间从11月3日至16日。该信号的最大的东向流速为0.133m s-1,最大南向流为0.124m s-1。谱分析发现垂向流速呈现出五个不同的流核,最强流核发生在600米至650米位置。近惯性能量下传速度为67±5 m d-1,从600米下传到1000米的位置能量耗散18%。EOF分解结果显示,这次近惯性振荡信号开始是第一模态占主导,随后变成高阶模态为主导的形式。结合前人的研究结果,我们发现此次近惯性振荡信号的生成原因不是受到台风引起,由于不知道其信号生成的源头,所以无法确定近惯性振荡形成原因。卫星的海表高度异常显示此时的正涡度有利于此次近惯性振荡发生蓝移特征。
关键词:  南海北部 近惯性振荡 谱分析 EOF分解
DOI:10.11693/hyhz20190300046
分类号:
基金项目:国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目, U1406401号;国家自然科学基金委员会-创新研究群体科学基金,41421005号;国家重点研发计划-准实时传输深海剖面锚系观测潜标研发,2017YFC1403400号
STUDY OF DEEP NEAR INERTIAL WAVE IN THE NORTH OF SOUTH
Hou Huaqian1, Yu Fei1, Li Bin2, Ren Qiang1, Wei Chuanjie1
1.Institute of Oceanology, Chinese academy of science;2.Shenyang Institute of Automation, Chinses academy of science
Abstract:
Based on the ADCP data in the Lander located in the north of South China Sea, a blue shifted near inertial wave signal is studied. This near inertial wave signal can be transfer under 600 meters depth, from September 3rd to 16th. The maximum meridional velocity was 0.133m s-1 and the maximum zonal velocity was 0.133m s-1. There are five different energy cores in the near inertial frequency band by Spectrum Analysis. The maximum energy core is from 600 meters to 650 meters depth. The vertical group velocity was 67±5 m d-1 downward. The energy dissipation is 18% from 600 meters down to 1000 meters. This near-inertial signal begins with the first EOF mode dominant, and then becomes the combination of higher-order EOF modes dominant. Combined with the research results of the predecessors, we found that the cause of the near-inertial oscillation signal was not caused by the typhoon. Since the source of the signal generation was not known, the cause of the near-inertial oscillation could not be determined. The Sea Level Anomaly date by satellite show us that the positive vorticity is beneficial to the blue shift characteristic of this near-inertial waves.
Key words:  North of South China Sea  Near inertial wave  Spectrum Analysis  EOF Analysis
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