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。
Observations show that there exist surprisingly energetic deep equatorial jets of alternating eastward and westward zonal currents between 1000-3000 meters (Luyten et al., 1980; Leetmaa et al., 1981; Eriksen, 1981). A linear, continuouslyvertically stratified dynamic model of the equatorial ocean is used to investigate themajor features of these jets in this paper. Tlie model is driven by an idealized off-equa-torial deep buoyancy oscillation. Tlie results show that the establishment process ofthe deep equatorial circulation forced by the water producfion in a shallow waterdynamic ocean model is equavelent to that represented by a single mode in a linearcontinously vertically stratified ocean dynamic model forced by the deep buoyancyforcing. The analytic solution shows that the decay effect of the vertical mixing on,the vertica1 modes is inversely proportional to the third power of the vertical modenumber. It is also clear frorn the solution that for the given parameters determiningthe wave number, the horizontal scale in the x-direction of the buoyancy forcinghas a significant effect on the vertical structure and velocity magnitude of the deepequatorial jets. Under the conditions of this paper, when the horizontal scale in theX-direction of the buoyancy forcing is less than 2000km, the simulated deep jetshave structures similar to those observed.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1995年第6期650-657,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金
国家海洋局科技发展基金!49276267
关键词
赤道深层射流
赤道陷波
每流
深层浮力源
Deep equatorial jets
Equatorial trapped waves
Vertical orthogonal mode
