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首页> 外文期刊>Journal of Physical Oceanography >The Subpolar Front of the Japan/East Sea. Part III: Competing Roles of Frontal Dynamics and Atmospheric Forcing in Driving Ageostrophic Vertical Circulation and Subduction
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The Subpolar Front of the Japan/East Sea. Part III: Competing Roles of Frontal Dynamics and Atmospheric Forcing in Driving Ageostrophic Vertical Circulation and Subduction

机译：日本/东海的亚极地带。第三部分：额叶动力学和大气强迫在驱动年龄营养型垂直循环和俯冲中的竞争作用

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摘要

The effects of wind stress and surface cooling on ageostrophic vertical circulation and subduction at the subpolar front of the Japan/East Sea are investigated using a nonhydrostatic numerical model. In experiments forced by wind and/or cooling, ageostrophic vertical circulation is enhanced relative to the unforced case. Both surface cooling and wind stress intensify the circulation by enhancing frontogenesis associated with frontal meandering. Winds further strengthen vertical motions by generating internal gravity waves. Downfront winds (i.e., oriented along the frontal jet) transport surface water from the denser to lighter side of the front, causing it to migrate toward the region of higher stratification and enhancing the vertical mixing at the front. This induces outcropping of isopycnals from the middle of the pycnocline along which surface water is subducted. Hence downfront winds enhance subduction down to the middle of the pycnocline, but not beneath. On the other hand, cooling uplifts isopycnals from greater depths to the surface so that it allows for the subduction of fluid to greater depths. In contrast to the vertical circulation, frontal subduction is more intensified by surface cooling than wind stress, because part of wind-forced circulation (e.g., internal gravity wave) does not contribute to subduction. Ageostrophic vertical circulation and frontal subduction are most intense when both wind stress and surface cooling are at play.
机译：利用非流体静力学数值模型研究了风应力和表面冷却对日本/东海副极锋年龄变质垂直循环和俯冲的影响。在由风和/或冷却强迫的实验中，相对于无强迫的情况，老龄化的竖向循环得到了增强。表面冷却和风应力都通过增强与额叶弯曲相关的额叶生成而增强了循环。风通过产生内部重力波进一步增强了垂直运动。下风（即沿前喷流定向）将地表水从前部的较密侧传输到较轻的侧部，导致其向较高分层的区域迁移，并增强了前部的垂直混合。这会引起从比克菌环的中部露出地表水的异比虫的露头。因此，前风增强了俯冲至中线的俯冲作用，但不至于之下。另一方面，冷却使等位面体从更大的深度隆起至地面，从而允许将流体俯冲到更大的深度。与垂直循环相比，表面冷却比风应力更能增强正面俯冲作用，因为部分风循环（例如内部重力波）对俯冲不起作用。当风应力和地表冷却同时发挥作用时，营养变质的垂直循环和额面俯冲作用最为强烈。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第6期|p.991-1011|共21页
  • 作者

    YUTAKA YOSHIKAWA; Craig M. Lee; Leif N. Thomas;

  • 作者单位

    RIAM, Kyushu University, 6-1 Kasuga Park, Kasuga, Fukuoka 816-8580, Japan;

    Applied Physics Laboratory, University of Washington, Seattle, Washington;

    Department of Environmental Earth System Science, Stanford University, Stanford, California;

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