| 南海北部深层近惯性振荡信号研究 |
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| 引用本文： | 侯华千,于非,李彬,任强,魏传杰.南海北部深层近惯性振荡信号研究[J].海洋与湖沼,2019,50(5):948-957. |
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| 作者姓名： | 侯华千 于非 李彬 任强 魏传杰 |
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| 作者单位： | 中国科学院海洋研究所;中国科学院大学;中国科学院沈阳自动化研究所机器人学国家重点实验室 |
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| 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。 |
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| 摘 要： | 本研究通过分析布放在南海北部的着陆器流速数据,研究一支蓝移的近惯性振荡信号,发现该信号可以传到600m水深以下,持续时间为11月3—16日。该信号的最大的东向流速为0.133m/s,最大南向流为0.124m/s。谱分析发现垂向流速呈现出5个不同的流核,最强流核发生在600—650m位置。近惯性能量下传速度为67±5m/d,从600m下传到1000m的位置能量耗散18%。经验正交函数(empiricalorthogonalfunction,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。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,结合前人的研究结果,可以排除台风引起此次近惯性振荡信号的生成。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。
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| 关 键 词： | 南海北部 近惯性振荡 谱分析 经验正交函数分解(empirical orthogonal function EOF) |
| 收稿时间： | 2019/3/1 0:00:00 |
| 修稿时间： | 2019/4/7 0:00:00 |
DEEP NEAR-INERTIAL WAVE IN THE NORTHERN SOUTH CHINA SEA |
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| HOU Hua-Qian,YU Fei,LI Bin,REN Qiang and WEI Chuan-Jie.DEEP NEAR-INERTIAL WAVE IN THE NORTHERN SOUTH CHINA SEA[J].Oceanologia Et Limnologia Sinica,2019,50(5):948-957. |
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| Authors: | HOU Hua-Qian YU Fei LI Bin REN Qiang and WEI Chuan-Jie |
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| Institution: | Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China;University of Chinese Academy of Science, Beijing 100049, China,Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China,State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China,Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China and Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China |
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| Abstract: | Based on the ADCP data in the lander located in the northern South China Sea (SCS), a blue shift near-inertial wave signal is studied. The lander was deployed in the northern SCS at 22.10°N/119.28°E in 1135m depth working from July 2017 to January 2018. This near-inertial wave signal transmitted to 600m depth during September 3-16. The maximum meridional velocity was 0.133m/s and the maximum zonal velocity was 0.133m/s. Five different energy cores in the near-inertial frequency band were recognized in spectrum analysis. The maximum energy core was in 600-650m depth. The vertical group velocity was 67±5m/d downward. The energy dissipation was 18% from 600 to 1000m. This near-inertial signal began with the first EOF mode dominant, and then became a combination of higher-order EOF mode dominant. Combined with the results of previous studies, we found that the near-inertial oscillation signal was not caused by a typhoon. As the source of the signal generation was unknown, the cause of the near-inertial oscillation could not be determined. The sea level anomaly data by satellite show that the positive vorticity at that time was conducive to the blue shift of the near-inertial waves. |
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| Keywords: | South China Sea near-inertial wave spectrum analysis empirical orthogonal function (EOF) |
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