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

赤道西太平洋1°45'S,156°E海区的半日内潮波特性

作　　者：鲍献文[1] 张义钧[2] 孙丽[1] 杜涛[1] 方欣华[1] 

机构地区：[1]中国海洋大学物理海洋实验室,山东青岛266003 [2]国家海洋信息中心,天津300171

出　　处：《Marine Science Bulletin》2006年第2期12-20,共9页海洋通报（英文版）

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).

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.通过对TOGA-COARE期间的一组锚系仪器阵列资料的分析得出:在赤道西太平洋1°45′S,156°E。海域存在显著的半日潮频内波,它的水平波数(波长)、垂向波数、水平传播速度和垂向传播速度分别约为:3.3×10-2km-1(210km),-1.6×10-3m-1,2.0m/s,-3.8cm/s。波形向斜下方传播,亦即波能向斜上方传输。它在观测点西南方生成后,向东北方向传播,到达观测海区。流速矢量旋转谱水平随深度的变化呈马鞍形,低谷及深处的峰所在深度分别与南赤道流及赤道潜流的南边界所在深度大体一致。旋转椭圆主轴方位角随深度变化,在浅层(40m处)为北偏东30°,到深处(324m)转为东偏南14°。总体上呈东北方向,表明波来自西南方向。

关 键 词：internal waves internal tides western equatorial Pacific Ocean TOGA-COARE 

分 类 号：P714.1[天文地球—海洋科学]