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首页> 外文期刊>Journal of Physical Oceanography >Latitude of Eastward Jet Prematurely Separated from the Western Boundary in a Two-Layer Quasigeostrophic Model
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Latitude of Eastward Jet Prematurely Separated from the Western Boundary in a Two-Layer Quasigeostrophic Model

机译：两层拟地转模型中早于西边界分离的东航急流的纬度

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摘要

This paper investigates the formation of eastward jets extended from western boundary currents, using a simple two-layer quasigeostrophic (QG) model forced by a wind stress curl consistent with the formation of a subtropical gyre. The study investigated the dependency of the latitude of the eastward jet on various parameters and on the meridional distribution of the Ekman pumping velocity. The parameters considered in the present study included the viscous and inertial western boundary layer width, the parameter representing the degree of the partial-slip boundary condition, the ratio of the upper-to lower-layer depth, and the bottom friction. With the parameters used, two types of stable structures are found in the time-mean field. One type of structure represented the "prematurely separated jet case,'' in which the eastward extension jet was located far south of the northern boundary of the subtropical gyre, as is the Kuroshio Extension; the other type was the "gyre boundary jet case,'' in which the eastward jet occurred along the northern boundary. The initial condition decides which type of structure would occur. When the prematurely separated jet case occurred, the authors found that the latitude of the eastward jet depended very little on the parameters. In addition, this study also observed that the latitude was determined by the meridional distribution of the Ekman pumping velocity. The eastward extension jet was usually located near the latitude that was half of the maximum value of the Sverdrup streamfunction and satisfied an integral condition derived from the QG potential vorticity equation.
机译：本文研究了一个简单的两层拟地转（QG）模型，该模型由与亚热带回旋的形成相一致的风应力弯曲作用，研究了从西边界流向东喷射的形成。该研究调查了东风急流的纬度对各种参数的依赖以及对埃克曼泵送速度的子午线分布的依赖。本研究中考虑的参数包括粘性和惯性西边界层宽度，代表部分滑移边界条件程度，上层与下层深度之比以及底部摩擦的参数。使用所使用的参数，可以在时均值字段中找到两种类型的稳定结构。一种类型的结构代表“过早分离的喷流箱”，其中向东延伸的喷流位于亚热带回旋管北边界的南部，而黑潮的延伸也是如此；另一种类型的结构为“回旋边界的喷流管，东射流沿北边界发生。初始条件决定了将发生哪种类型的结构。当发生过早分离的喷流情况时，作者发现向东喷流的纬度对参数的依赖性很小。此外，这项研究还观察到纬度是由Ekman抽速的子午线分布决定的。东伸射流通常位于纬度附近，该纬度是Sverdrup流函数最大值的一半，并且满足从QG势涡方程推导的积分条件。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第3期|737-754|共18页
  • 作者

    Sue Yasunori; Kubokawa Atsushi;

  • 作者单位

    Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido 0600808, Japan;

    Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido 0600808, Japan;

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