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QIAN Hongbao,HUANG Xiaodong,TIAN Jiwei,ZHAO Wei. 2015. Shoaling of the internal solitary waves over the continental shelf of the northern South China Sea. Acta Oceanologica Sinica, 34(9):35-42
Shoaling of the internal solitary waves over the continental shelf of the northern South China Sea
南海北部陆架区内孤立波向岸传播过程研究
Received:November 23, 2014  Revised:February 12, 2015
DOI:10.1007/s13131-015-0734-4
Key words:internal solitary wave  nonlinear internal wave  South China Sea  vertical mode
中文关键词:  内孤立波  非线性内波  南海  垂向模态
基金项目:
Author NameAffiliationE-mail
QIAN Hongbao Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
The Administrative Centre for China's Agenda 21, Beijing 100089, China 
 
HUANG Xiaodong Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China xhuang@ouc.edu.cn 
TIAN Jiwei Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China  
ZHAO Wei Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China  
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Abstract:
      The activities of internal solitary waves (ISWs) over the continental shelf of the northern South China Sea (SCS) are of high complexity. In this study, we investigated the spatial-temporal characteristics of the shoaling ISWs over the northern SCS continental shelf using the satellite images and the results of numerical simulation. The examination of the ISW signals in the satellite optical images revealed the existence of three types of ISWs in the region north to the Dongsha Island, namely, mode-1 depression ISW, mode-1 elevation ISW, and mode-2 convex ISW. The geographical distributions of these ISWs were derived from the satellite images. Numerical results exhibited the process of polarity conversion of ISWs, by which mode-1 elevation waves were transformed from the shoaling mode-1 depression waves. The mode-2 convex ISWs generally followed the mode-1 depression ISWs. The numerical results suggested that the interaction of the mode-1 depression ISWs with the up-slope topography locally generated mode-2 ISWs, and such waves of high vertical mode dissipated rapidly during the inshore propagation.
中文摘要:
      南海北部是全球海洋中内孤立波最强和最为活跃的海域。然而,内孤立波在传入陆架区后,其形态发生显著变化,其传播演变过程表现出高度的复杂性。本研究综合卫星图像和数值模式手段研究了内孤立波在向岸传播过程中的空间变化特征。可见光卫星图像研究结果显示,南海北部陆架区存在三种形态的内孤立波,分别为第一模态下凹型内孤立波、第一模态上凸型内孤立波和第二模态内孤立波。受水深和层结变化的控制,它们的分布区域显著不同。基于MITgcm的数值模拟研究表明,上凸型内孤立波由第一模态下凹内孤立波经过极性转换过程发展而来,而第二模态内孤立波由第一模态下凹内孤立波与急剧变浅地形相互作用而产生。
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