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南海文昌海域内孤立波特征观测研究
柯自明, 尹宝树, 徐振华, 侯一筠
中国科学院海洋研究所 中国科学院海洋环流与波动重点实验室
摘要:
内孤立波对大陆架边缘海区的混合和生态有着显著影响, 近年来已成为物理海洋学研究的热点。但是南海北部陆架的内波现场资料极为缺乏。2005 年4—7 月, 中国科学院海洋研究所在文昌海区进行了文昌内波实验。通过此次现场观测数据发现, 在4 月下旬文昌海域有着强盛的内孤立波,其振幅在40 m 左右, 产生的斜压流接近1 m/s, 且传播方向平行于等深线切线方向, 向西南方向传播。分析还得出此类内孤立波并非发源于吕宋海峡, 应该属于潮地相互作用局地生成的内孤立波。
关键词:  南海, 文昌, 内孤立波, 现场观测, 斜压流
DOI：10.11693/hyhz200903003003
分类号:
基金项目:国家863 资助项目, 2006AA09A109-2 号和中国科学院知识创新工程重大项目资助, KZCX1-YW-12 号
THE CHARACTERISTICS OF INTERNAL SOLITARY WAVES AT WENCHANG IN THE SOUTH CHINA SEA
KE Zi-Ming, YIN Bao-Shu, XU Zhen-Hua, HOU Yi-Jun
Institute of Oceanology, Chinese Academy of Sciences, Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Science
Abstract:
Thermistor chains and acoustic Doppler current profiles were deployed at the east of Hainan Island to examine the thermal and hydrodynamic structure of the Wenchang Shelf. These instruments sampled temperature every minute and current velocity every 10 min from April 17th to July 21 in 2005. Analysis of the time series revealed that the in situ data were dominated by internal solitary wave packets signals. We found large-amplitude nonlinear internal solitary waves at the end of April and they propagated to the southwest paralleling with the isobaths in this area. They probably resulted from the local shelf break and were rarely observed in SAR data.
Key words:  South China Sea, Wenchang, Internal solitary wave, Observation, Baroclinic current
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