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首页> 外文期刊>Journal of Physical Oceanography >Thermohaline Structure in the Subarctic North Pacific Simulated in a General Circulation Model
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Thermohaline Structure in the Subarctic North Pacific Simulated in a General Circulation Model

机译：通用环流模式模拟的北极北太平洋的热盐结构

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摘要

The Miami Isopycnic Coordinate Ocean Model configured with 1° horizontal resolution and 23 layers is used to examine processes that maintain the mesothermal structure, a subsurface temperature inversion, in the subarctic North Pacific. The model successfully reproduces the mesothermal structure consisting of a shallow temperature minimum and an underlying temperature maximum that are called the dichothermal and mesothermal waters, respectively. The mesothermal water is formed through cross-gyre exchange between the subtropical and subarctic gyres, whereas the dichothermal water originates from cold and low-salinity waters formed in the winter mixed layer. The horizontal distribution of the passive tracer injected into the subsurface layers south of Japan shows that warm and saline water of the Kuroshio in the density range of 26.8-27.0 σ_θ is the source of the mesothermal water. There are three pathways through which the Kuroshio waters enter the subarctic region. First, the Euroshio waters that cross the gyre boundary in the western boundary region are carried to the Alaskan gyre by the northern part of the North Pacific Current. Second, the Kuroshio waters carried by the southern part of the North Pacific Current enter the Alaskan gyre through a cross-gyre window in the eastern basin. Third, the Kuroshio waters that diffuse along the isopycnal in the Kuroshio-Oyashio Extension enter the western subarctic gyre. The mesothermal water thus formed in the subarctic region is entrained into the winter mixed layer and returns to the subtropics as surface water by the southward Ekman drift, forming the subpolar cell.
机译：配置有1°水平分辨率和23层的Miami Isopycnic坐标海洋模型用于检查在北极北太平洋维持中等温度结构（地下温度反演）的过程。该模型成功地再现了由浅水温度最小值和下层温度最高温度组成的中热结构，分别称为地热水和中热水。中亚热水是通过副热带和亚北极回旋之间的交叉旋回交换而形成的，而双热水则起源于冬季混合层中形成的冷水和低盐度水。向日本南部地下注入的被动示踪剂的水平分布表明，黑潮的温盐水和盐水在26.8-27.0σ_θ的密度范围内是中温水的来源。黑潮水通过三种途径进入北极地区。首先，在西边界区域内越过旋回边界的Euroshio水域被北太平洋洋流的北部带到阿拉斯加旋回。其次，北太平洋洋流南部携带的黑潮水域通过东部盆地的一个跨涡旋窗进入阿拉斯加旋涡。第三，在黑潮—大潮扩展区的等渗线上扩散的黑潮水进入西部的北极亚弧。这样在亚北极地区形成的中温水被夹带到冬季混合层中，并通过向南的Ekman漂移而作为地表水返回亚热带，形成亚极电池。

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