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首页> 外文期刊>Journal of Physical Oceanography >Topographic Control of Southern Ocean Gyres and the Antarctic Circumpolar Current: A Barotropic Perspective
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Topographic Control of Southern Ocean Gyres and the Antarctic Circumpolar Current: A Barotropic Perspective

机译：南部海洋涡旋和南极绕极洋流的地形控制：正压视角

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摘要

In the Southern Ocean the Antarctic Circumpolar Current is significantly steered by large topographic features, and subpolar gyres form in their lee. The geometry of topographic features in the Southern Ocean is highly variable, but the influence of this variation on the large-scale flow is poorly understood. Using idealized barotropic simulations of a zonal channel with a meridional ridge, it is found that the ridge geometry is important for determining the net zonal volume transport. A relationship is observed between ridge width and volume transport that is determined by the form stress generated by the ridge. Gyre formation is also highly reliant on the ridge geometry. A steep ridge allows gyres to form within regions of unblocked geostrophic (f/H) contours, with an increase in gyre strength as the ridge width is reduced. These relationships among ridge width, gyre strength, and net zonal volume transport emerge to simultaneously satisfy the conservation of momentum and vorticity.
机译：在南大洋中，南极绕极洋流受到大型地形特征的明显控制，并且在其背风中形成了亚极回旋。南大洋的地形特征的几何形状变化很大，但这种变化对大尺度流动的影响知之甚少。使用具有子午脊的纬向通道的理想正压模拟，发现脊的几何形状对于确定净纬向体积传输很重要。观察到脊宽与体积传输之间的关系，该关系由脊产生的形变应力确定。回转体的形成也高度依赖于脊的几何形状。陡峭的山脊允许回旋形成在无阻塞的地转（f / H）轮廓区域内，随着山脊宽度的减小，回旋强度也会增加。出现了脊宽，回旋强度和净纬向体积输运之间的这些关系，以同时满足动量和涡度的守恒。

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