Driving mechanism of the Deep Antarctic Circumpolar Current by the meso-scale eddies..

中尺度涡驱动南极深部绕极流的机制

• 批准号: 14540407
• 负责人: SAKAI Satoshi
• 金额: $ 2.18万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540407/
• 关键词: Rotating tank; Meso-scale Eddies; Antarctic Circumpolar Current; Deep water circulation; 回転水槽実験

It is known that the Antarctic Circumpolar Current is flowing the surroundings of Antarctica for the east to the depths considerably. Although this origin is vaguely considered to be what is depended on the wind which generally blows a sea top in many cases, it is hard to consider the mechanism which stress of a wind cannot affect the direct depths, and runs through density stratification through Ekman convergence and emission, and does that influence to the depths dynamically. Then, it is the purpose of this research to confirm whether an indoor experiment is conducted using a rotation tank, a turbulent flow isotropic as initial turbulence is given, and, finally the flow facing the east is formed in the surroundings of a pole of nonlinear acceleration of turbulence.The experiment tank was making it rotate per minute 100 times with a cylinder form, changed depth of water in the shape of a concentric circle, and produced beta effect. Initial turbulence generating equipment repeated tria … More l and error many times, finally, is drawing out the stick inserted underwater in early stages, and carried out it to generating initial turbulence. Although this method considered another method at the beginning in order that the bunch of the drawn-out stick might interrupt the field of view of a camera, this method is turbulence's being generated most certainly and dividing the drawn-out stick by centrifugal force into two, and it is having developed the method of securing the field of view of a camera, and was made to adopt this method. Visualization of a flow hit the light of the shape of a sheet which put in order and made the light emitting diode to the styrene bead distributed underwater, and succeeded in visualizing the flow in the tank central part without the influence of the wind on surface tension or the water surface.Although the initial turbulence of two or more sizes was given and being repeatedly experimented in the experiment, the quite strong flow facing the east was obtained altogether. Although it had resulted in becoming for the east when the probability which serves as west Nagare in the centering on pole concentric circle [this/in numerical computation]-like sea in comparison with the numerical computation of Yamada and others was high and the pole was shifted, in an experiment, it always becomes a flow facing the east. By numerical computation, boundary conditions are slip conditions and this is considered to be because for quantity of motion not to be given on the boundary in the concentric circle-like sea. Less

据了解，南极绕极流是流动的周围南极洲东部的深度相当。虽然这一起源在许多情况下被模糊地认为是依赖于通常吹着海面的风，但很难考虑风应力不会影响直接深度，并通过Ekman收敛和发射贯穿密度层结，并动态地影响深度的机制。本研究的目的是确认是否在室内进行旋转水槽实验，以各向同性的紊流作为初始紊流，在紊流的非线性加速极点的周围形成朝向东方的流。实验水槽以圆筒状每分钟旋转100次，改变了同心圆形状的水深，并产生了贝塔效应。初始湍流发生设备重复试验 ...更多信息 l和误差多次，最后，是拔出早期插入水下的棒，并进行初始湍流的产生。虽然该方法在开始时考虑了另一种方法，以便抽出的棒束可能会干扰相机的视场，但该方法是最肯定地产生湍流并通过离心力将抽出的棒分成两部分，并且它开发了确保相机视场的方法，并被采用该方法。流动的可视化击中了按顺序排列并使发光二极管到苯乙烯珠分布在水下的片状光，并且成功地可视化了在没有风对表面张力或水面的影响的情况下在罐中心部分的流动。虽然给出了两个或更多个尺寸的初始湍流并在实验中反复实验，总体上获得了朝东的相当强的流动。虽然它已经导致成为东时，作为西Nagare在以极同心圆[这/在数值计算]-类似的海与山田等人的数值计算相比，是高的概率和极移动，在实验中，它总是成为一个面向东的流。通过数值计算，边界条件是滑移条件，这被认为是因为在同心圆状的海洋中，运动量在边界上是不给定的。少