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首页> 外文期刊>Journal of Physical Oceanography >A Thickness-Weighted Average Perspective of Force Balance in an Idealized Circumpolar Current
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A Thickness-Weighted Average Perspective of Force Balance in an Idealized Circumpolar Current

机译：理想圆极电流中力平衡的厚度加权平均透视图

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摘要

The exact, three-dimensional, thickness-weighted averaged (TWA) Boussinesq equations are used to diagnose eddy-mean flow interaction in an idealized circumpolar current (ICC). The force exerted by meso-scale eddies on the TWA velocity is expressed as the divergence of the Eliassen-Palm flux tensor. Consistent with previous findings, the analysis indicates that the dynamically relevant definition of the ocean surface layer is composed of the set of buoyancy coordinates that ever reside at the ocean surface at a given horizontal position. The surface layer is found to be a physically distinct object with a diabatic and force balance that is largely isolated from the underlying adiabatic region in the interior. Within the ICC surface layer, the TWA meridional velocity is southwardorthward in the top/bottomhalf and has a value near zero at the bottom. In the top half of the surface layer, the zonal forces due to wind stress and meridional advection of potential vorticity act to accelerate the TWA zonal velocity; equilibrium is obtained by eddies decelerating the zonal flow via a downward flux of eastward momentum that increases with depth. In the bottom half of the surface layer, the accelerating force of the wind stress is balanced by the eddy force and meridional advection of potential vorticity. The bottom of the surface layer coincides with the location where the zonal eddy force, meridional advection of potential vorticity, and zonal wind stress force are all zero. The net meridional transport S-f within the surface layer is a small residual of its southward and northward TWA meridional flows. The mean meridional gradient of the surface layer buoyancy is advected by S-f to balance the surface buoyancy flux.
机译：精确的三维厚度加权平均（TWA）Boussinesq方程可用于诊断理想化的圆极电流（ICC）中的涡流平均相互作用。中尺度涡旋对TWA速度的作用力表示为Eliassen-Palm通量张量的发散度。与先前的发现一致，分析表明，海洋表面层的动态相关定义由曾经位于给定水平位置的海洋表面上的一组浮力坐标组成。发现表面层是具有绝热和力平衡的物理上不同的物体，该绝热和力平衡与内部的下层绝热区域基本隔离。在ICC表层内，TWA子午速度在顶部/底部是南/北，底部的值接近于零。在表层的上半部分，由于风应力和子午流的对流而产生的纬向力会加速TWA纬向速度。涡旋是通过涡旋通过随着深度增加而向东的动量的向下通量来使地层流减速来实现的。在表层的下半部分，风势的加速力通过涡旋力和潜在涡度的子午对流来平衡。表层的底部与纬向涡力，势涡的子午对流和纬向风应力都为零的位置重合。表层内的净子午线输运S-f是其向南和向北TWA子午流的一小部分残差。 S-f对表面层浮力的平均子午梯度进行平移，以平衡表面浮力通量。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第2期|285-302|共18页
  • 作者

    Ringler Todd; Saenz Juan A.; Wolfram Phillip J.; Van Roekel Luke;

  • 作者单位

    Los Alamos Natl Lab, Fluid Dynam & Solid Mech, Los Alamos, NM 87544 USA;

    Los Alamos Natl Lab, Fluid Dynam & Solid Mech, Los Alamos, NM 87544 USA;

    Los Alamos Natl Lab, Fluid Dynam & Solid Mech, Los Alamos, NM 87544 USA;

    Los Alamos Natl Lab, Fluid Dynam & Solid Mech, Los Alamos, NM 87544 USA;

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