Characteristics of Semi-diurnal Internal Tides in the Western Equatorial Pacific Ocean Around 1°45′S,156°E

作     者：鲍献文 张义钧 孙丽 杜涛 方欣华 BAO Xianwen;ZHANG Yijun;SUN Li;DU Tao;FANG Xinhua

作者机构：中国海洋大学物理海洋实验室山东青岛266003 国家海洋信息中心天津300171 

出 版 物：《Marine Science Bulletin》 (海洋通报（英文版）)

年 卷 期：2006年第8卷第2期

页      面：12-20页

学科分类：08[工学] 0816[工学-测绘科学与技术] 

基　　金：This paper is supported by the National Natural Science Foundation of China(Projects under contracts No.49676275,49976002,40506007) Microwave Imaging National Key Laboratory Foundation(No.51442020103JW1002) 

主　　题：internal waves internal tides western equatorial Pacific Ocean TOGA-COARE 

摘      要：The analyses of a data series obtained during TOGA- COARE show the existence of remarkable semi-diurnal intemal tides in the western equatorial Pacific Ocean around 1°45＇S, 156°E. Some characteristic parameters of the internal tides are vertical wavenumber -1.6×10^-3 m^-1, horizontal wavenumber （wavelength） 3.3×10^-2 km^-1 （210 km）, vertical propagation speed -3.8 cm/s and horizontal propagation speed 2.0 m/s. The waveforms propagate downwards slantingly, that is, the wave energy transfers upwards slantingly. Depth-distribution of the＇rotary spectral levels is a saddle-shape. The depths of the trough and the deeper peaks are almost coincident with those of the south boundaries of the South Equatorial Current and the Equatorial Undercurrent, respectively. The mean orientation of the rotary spectral ellipse changes with depth： 30° from north to east at 40 m, and changes into 14° from east to south at 324 m, and generally, it points to northeastward, which indicates ＂that waves come from the southwest.