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首页> 外文期刊>Nonlinear processes in geophysics >Interaction of a monopole vortex with an isolated topographic feature in a three-layer geophysical flow
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Interaction of a monopole vortex with an isolated topographic feature in a three-layer geophysical flow

机译：三层地球物理流中单极涡旋与孤立地形特征的相互作用

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In the frame of a three-layer, quasi-geostrophic analytical model of an f-plane geophysical flow, the Lagrangian advection induced by the interaction of a monopole vortex with an isolated topographic feature is addressed. Two different cases when the monopole is located either within the upper or the middle layer are of our interest. In the bottom layer, there is a delta-function topographic feature, which generates a closed recirculation region in its vicinity due to the background flow. This recirculation region extends to the middle and upper layers, and it plays the role of a topographic vortex. The interaction between the monopole and the topographic vortex causes a complex, including chaotic, advection of fluid particles. We show that the model's parameters, namely the monopole and topographic vortices' strengths and initial positions, and the layers' depths and densities, are responsible for the diverse advection patterns. While the patterns are rather complicated, one can single out two major processes, which mostly govern the fluid particle advection. The first one is the variation in time of the system's phase space structure, so that within the closed region of the topographic vortex, there appear periodically unclosed particle pathways by which the particles leave the topographic vortex. The second one is chaotic advection that arises from the nonstationarity of the monopole-topography interaction.
机译：在f平面地球物理流的三层准地转分析模型的框架中，解决了由单极涡旋与孤立的地形特征相互作用引起的拉格朗日对流。单极子位于上层或中层内的两种不同情况是我们感兴趣的。在底层，有一个三角函数形的地形特征，由于背景流动，该特征在其附近产生了一个封闭的再循环区域。该再循环区域延伸到中层和上层，并起着地形涡旋的作用。单极子与地形涡旋之间的相互作用会导致复杂的流体粒子对流，包括混沌对流。我们表明，模型的参数，即单极子和地形涡旋的强度和初始位置，以及层的深度和密度，是造成各种对流模式的原因。尽管模式相当复杂，但人们可以挑出两个主要过程，它们主要控制着流体粒子的对流。第一个是系统相空间结构在时间上的变化，因此在地形涡旋的封闭区域内，会出现周期性未封闭的粒子路径，粒子通过这些路径离开地形涡旋。第二个是由单极-地形相互作用的非平稳性引起的混沌对流。

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