| 摘要: |
| 基于赤道深层射流动力模型，研究赤道深层射流对深层浮力源的响应特征，指出线性、连续层化海洋中浮力源驱动下的单一垂直模态建立深层环流的过程等价干线性浅水系统中深水源驱动的深层环流的建立过程。分析赤道深层射流对深层浮力源响应解的某些特征，结果表明，在给定确定被数量值的诸参数下，浮力源在纬向上范围的大小对赤道深层射流的铅垂结构及射流流速有显著影响。 |
| 关键词: 赤道深层射流 赤道陷波 垂直正交模态 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金和国家海洋局科技发展基金资助项目，49276267号 |
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| THE CHARACTERISTIC ANALYSES OF THE DEEP EQUATORIAL JET RESPONSE TO A DEEP BUOYANCY FORCING |
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Wu Dexing,Feng Shizuo
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Institute of Physical Oceanography, University of Qingdao, Qingdao 266003
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| Abstract: |
| Observations show that there exist surprisingly energetic deep equatorial jets of alternating eastward and westward zonal currents between 1000 - 3 000 meters (Luyten et al., 1980; Leetmaa et al., 1981; Eriksen, 1981). A linear, continuously vertically stratified dynamic model of the equatorial ocean is used to investigate the major features of these jets in this paper. The model is driven by an idealized off-equatorial deep buoyancy oscillation. The results show that the establishment process of the deep equatorial circulation forced by the water production in a shallow water dynamic ocean model is equavelent to that represented by a single mode in a linear continously vertically stratified ocean dynamic model forced by the deep buoyancy forcing. The analytic solution shows that the decay effect of the vertical mixing on. the vertical modes is inversely proportional to the third power of the vertical mode number. It is also clear from the solution that for the given parameters determining the wave number, the horizontal scale in the x-direction of the buoyancy forcing has a significant effect on the vertical structure and velocity magnitude of the deep equatorial jets. Under the conditions of this paper, when the horizontal scale in the X-direction of the buoyancy forcing is less than 2 000 km, the simulated deep jets have structures similar to those observed. |
| Key words: Deep equatorial jets, Equatorial trapped waves, Vertical orthogonal mode |
