| 摘要: |
| 根据1990年初夏南海西南部水域的两个连续站CTD和多层海流计资料及50多个大面站CTD资料的分析研究得到一些关于此海域的内波和细结构的特性。它包括等温、盐、密度面起伏的特性，盐度双跃层和逆盐层等长存性细结构、温度Cox数的概率密度函数及流速频谱的特性，Cox数和温度脉动垂向波数谱的一般品性及其随水层和地域的变化规律等诸方面。 |
| 关键词: 内波 细结构 微结构 南海 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助，4880228;国家重点专项85－927－05－03部分成果 |
附件 |
|
| INTERNAL WAVES AND FINE STRUCTURE IN THE SOUTHWESTERN AREA OF THE SOUTH CHINA SEA |
|
Fang Xinhua1, Bao Xianwen1, Zhang Yulin1, Lao Zhisheng2
|
|
1.Physical Oceanographic Institute, Ocean University of Qingdao 266003;2.Institute of Estuarine and Coastal Research, East China Normal University, Shanghai 200062
|
| Abstract: |
| The properties of internal waves and finestructure were studied on the basis of an early summer southwestern South China Sea observation involving 2 stations with consecutive CTD casts and some multilayered currentmeters, and more than 50 spaced CTD stations in 1990. The results show that the intensity of internal waves varies with the regions. Observed heights of low frequency waves were up to 20m. The frequency spectra of the velocities follow a-2 power law and have some significant deterministic components including diurnal tides, and others with unknown generation mechanism. The analysis of vertical profiles and oscillations of isotherms, isohalines and isopycnals reveals that there are irreversible finestructure formed by intrusion, reversible finestructure induced by internal wave strain as well as permanent double halocline and haline-inverse layers. The vertical wave number spectra of temperature fluctuations are slightly different from those in the oceans, are steeper than those of the laters, and vary with layers and areas, steeper in deeper layer and southwestern area, and flatter in upper layer and northeastern area. The values of the temperature Cox numbers are different from region to region, higher in the shallower southwestern region, lower in the deeper northwestern region and lowest in the central region. The probability density function of the logarithm of the temperature Cox-numbers is quite close to the normal distribution, except for being more concentrated and skew to the lower band. An expression fitting the experiential distribution is presented. |
| Key words: Internal waves, Fine structure, Microstructure, South China Sea |
