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首页> 外文期刊>Journal of Physical Oceanography >Dynamics of Gap-Leaping Western Boundary Currents with Throughflow Forcing
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Dynamics of Gap-Leaping Western Boundary Currents with Throughflow Forcing

机译：通过流量强迫间隙跨越跨越跨界边界电流的动态

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摘要

The dynamics of gap-leaping western boundary currents (e.g., the Kuroshio intrusion, the Loop Current) are explored through rotating table experiments and a numerical model designed to replicate the experimental apparatus. Simplified experimental and numerical models of gap-leaping systems are known to exhibit two dominant states (leaping or penetrating into the gap) as the inertia of the current competes with vorticity constraints (in this case the beta effect). These systems are also known to admit multiple states with hysteresis. To advance toward more realistic oceanographic scenarios, recent studies have explored the effects of islands, mesoscale eddies, and variable baroclinic deformation radii on the dynamical system. Here, the effect of throughflow forcing is considered, with particle tracking velocimetry (PTV) used in the laboratory experiments. Mean transport in or out of the gap is found to significantly shift the hysteresis range as well as change its width. Because of these transformations, changes in throughflow can induce transitions in the gap-leaping system when near a critical state (leaping-to-penetrating/penetrating-to-leaping). Results from the study are interpreted within a nonlinear dynamical framework and various properties of the system are explored.
机译：通过旋转台实验和旨在复制实验装置的数值模型，探索间隙跳跃跨界电流的动态（例如，Kuroshio侵入，环电流）。已知间隙跳跃系统的简化实验性和数值模型表现出两个主要状态（跳跃或渗透到间隙），因为电流的惯性与涡流约束（在这种情况下β效应）。还已知这些系统通过滞后承认多个状态。为了推进更现实的海洋学情景，最近的研究已经探索了岛屿，中尺度漩涡和可变条状变形半径对动力系统的影响。这里，考虑通过在实验室实验中使用的颗粒跟踪速度（PTV）的通风迫使的效果。发现间隙中的平均传输或出于间隙的转运显着偏移滞后范围以及改变其宽度。由于这些变换，通过流出的变化可以在临界状态（跳到渗透/渗入到跳跃）附近时诱导间隙跳跃系统的转变。该研究的结果在非线性动力框架内解释，探索了系统的各种性质。

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