Transport in an Idealized Three-Gyre System with Application to the Adriatic Sea

IRINA I. RYPINA; MICHAEL G. BROWN; HUSEYIN KOCAK

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Transport in an Idealized Three-Gyre System with Application to the Adriatic Sea

机译：理想的三回转系统中的运输及其在亚得里亚海的应用

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Motivated by observations of surface drifters in the Adriatic Sea, transport in a three-gyre system is studied with the aid of dynamical systems techniques. Particular attention is paid to the issue of intergyre transport. The velocity field is assumed to be two-dimensional and incompressible and composed of a steady three-gyre background flow on which a time-dependent perturbation is superimposed. Two systems of this type are considered: 1) an observationally motivated, analytically prescribed model consisting of a steady background on which a multiperiodic time-dependent perturbation is superimposed, and 2) an observationally based model of the Adriatic Sea consisting of the mean surface circulation derived from surface drifter trajectories on which a time-dependent altimetry-based perturbation velocity field is superimposed. It is shown that for a small perturbation to the steady three-gyre background, two of the gyres exchange no fluid with the third gyre. When the perturbation strength exceeds a certain threshold, transport between all three gyres occurs. This behavior is described theoretically, illustrated using the analytic model and shown to be consistent with the observationally based model of the Adriatic. The relevance of the work presented to more complicated multiple-gyre problems is discussed.

机译：受亚得里亚海表面漂流者观测的推动，借助动力系统技术研究了三旋流系统中的运输。特别注意了转轮运输问题。假定速度场是二维且不可压缩的，并且由稳定的三旋流本底流组成，在其上叠加了随时间变化的扰动。考虑了两种这种类型的系统：1）由观测驱动的，由分析规定的模型，该模型由一个稳定的背景组成，在该背景上叠加了多周期的与时间有关的扰动，以及2）基于观测的亚得里亚海模型，包括平均地表环流从表面漂移轨迹推导而来，在表面轨迹上叠加了基于时间的基于测高的摄动速度场。结果表明，对于对稳定的三旋流器背景的微小扰动，其中两个旋流器与第三旋流器没有流体交换。当摄动强度超过某个阈值时，将在所有三个回旋之间发生传输。此行为从理论上进行了描述，使用分析模型进行了说明，并与亚得里亚海的基于观测的模型相一致。讨论了所提出的工作与更复杂的多回转问题的相关性。

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《Journal of Physical Oceanography》 |2009年第3期|p.675-690|共16页
作者
IRINA I. RYPINA; MICHAEL G. BROWN; HUSEYIN KOCAK;
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Physical Oceanography Department, Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02543;

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Transport in an Idealized Three-Gyre System with Application to the Adriatic Sea

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