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LIN Feilong,HOU Yijun,LIU Ze,HU Po,FANG Yong,DUAN Yongliang. 2014. The influence of background waves on internal solitary waves after the transit of Typhoon Neast in the northern South China Sea. Acta Oceanologica Sinica, 33(7):40-47
The influence of background waves on internal solitary waves after the transit of Typhoon Neast in the northern South China Sea
南海北部孤立波对近岸波动的响应
Received:June 09, 2013  Revised:November 26, 2013
DOI:10.1007/s13131-014-0511-9
Key words:internal solitary wave  shear instability  near-inertial waves  internal tides
中文关键词:  内孤立波剪切不稳定,近惯性波动,内潮
基金项目:The National Nature Science Foundation of China under contract Nos U1133001, 41030855 and 2013AA09A502.
Author NameAffiliationE-mail
LIN Feilong Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
HOU Yijun Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China 
yjhou@ms.qdio.ac.cn 
LIU Ze Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China 
 
HU Po Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China 
 
FANG Yong Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
DUAN Yongliang Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
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Abstract:
      On the basis of the time series observations from a temperature chain and an acoustic Doppler current profiler on the continental shelf of the northern South China Sea, a sequence of internal solitary waves (ISWs) and background waves (BWs, including internal tides and near-inertial waves) on the continental shelf were captured simultaneously after the transit of Typhoon Neast in October 2011. These measurementsprovided a unique opportunity to explore the influence of BWs on the ISWs. The BWs appeared a conversion on the current strength and vertical mode structure during the observational period. The BWs were dominated by weak and mode-one waves before October 2 and then turned to strong and high-mode waves after that time. Meanwhile, the ISWs displayed different wave structures before and after October 2, which was closely related to BWs' changes. According to the current profiles of BWs, the high-mode wave structure with strong current could significantly strengthen the vertical shear of ISWs in the near-surface layer and promote the breaking of ISWs, and thus it may play an important role in affecting the background current condition.
中文摘要:
      2011年10月在东沙西南部投放一套潜标。观测期间有台风经过潜标区域,潜标上的ADCP和温度仪同时观测到孤立波和陆架内波(近惯性内波和内潮波)。文中研究了同时出现的陆架内波和孤立波,进一步探讨了近岸内波对孤立波的影响方式。研究中发现孤立波并非局地产生,并且孤立波引起的流动垂向分布与近岸波动区别明显。通过研究陆架波动和孤立波两种波动引起流动的垂向分布,发现陆架波动通过改变孤立波的垂向剪切来影响孤立波的稳定性,促进孤立波的破碎。
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