Successive formation of planetary lenses in an intermediate layer
Successive formation of planetary lenses in an intermediate layer
复制标题
在中间层连续形成行星透镜
DOI：
10.1080/03091920008203709
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发表时间：
2000
影响因子：
1.3
通讯作者：
T. Yamagata
中科院分区：
文献类型：
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作者：
H. Aiki;T. Yamagata
摘要本文用2.5层β平面原始方程模式研究了海洋中层水透镜体的形成。对于1.0 Sv的注入率，我们已经观察到，强涡脱落定期。这些涡旋向西传播的速度比第二斜压Rossby长波快得多。它们彼此完全孤立，并表现出很强的斜压性。此外，它们在足够长的时间内保持稳定。在中间层中有规律地形成如此强的涡旋以前还没有报道过。用非线性斜压涡旋在β平面上的欧拉动量积分定理解释了平移速度。我们已经证明，在中间层的主运动和上层的二次运动之间的耦合与纬向移动是至关重要的快速向西平移的强烈的涡旋。在准地转假设下，还导出了一个简单的关于纬向平移速度与涡旋半径的频散公式。事实证明，解析关系解释的数值结果令人惊讶地好，尽管其推导的限制。
Abstract We study the formation of lenses of the ocean's intermediate water using a 2.5-layerβ-plane primitive equation model with localized injection of water mass. For the injecting rate of 1.0 Sv, we have observed that strong vortices are shed regularly. These vortices propagate westward much faster than the second baroclinic long Rossby wave. They are totally isolated from each other and show strong baroclinicity as well. Moreover, they remain stable over a sufficiently long period of time. Regular formation of such strong vortices in the intermediate layer has not been reported previously. The translation speed is explained using the Euler's momentum integral theorem for the nonlinear baroclinic vortex on the β-plane. We have demonstrated that coupling between the primary motion in the intermediate layer and the secondary motion in the upper layer with a meridional shift is crucial to the fast westward translation of the intense vortices. A simple dispersion formula relating the zonal translation speed with the vortex radius is also derived under the assumption of quasi-geostrophy. It has turned out that the analytical relation explains the numerical results surprisingly well despite the limitation of its derivation.
HIRAI,M.：Am.J.Primatol.(1989)
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