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首页> 外文期刊>Journal of oceanography >Alternating Zonal Flows in a Two-Layer Wind-Driven Ocean
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Alternating Zonal Flows in a Two-Layer Wind-Driven Ocean

机译：两层风驱动海洋中的交替带状流

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摘要

Alternating zonal flows in an idealized wind-driven double-gyre ocean circulation have been investigated using a two-layer shallow-water eddy-permitting numerical model. While the alternating zonal flows are found almost everywhere in the time-mean zonal velocity field, their meridional scales differ from region to region. In the subpolar western boundary region, where the energetic eddy activity induces quasi two-dimensional turbulence, the alternating zonal flows are generated by the inverse energy cascade and its arrest by Rossby waves, and the meridional scale of the flows corresponds well to the Rhines scale. In the eastern part of the basin, where barotropic basin modes are dominant, the zonal structure is formed through the nonlinear effect of the basin modes and is wider than the Rhines scale. Both effects are likely to form zonal structure between the two regions. These results show that Rossby basin modes become an important factor in the formation of alternating zonal flows in a closed basin in addition to the arrest of the inverse energy cascade by Rossby waves. The wind-driven general circulation associated with eddy activities plays an essential role in determining which mechanism of the alternating zonal flows is possible in each region.
机译：利用两层浅水涡流数值模型研究了理想化的风驱动双旋流海洋环流中的交替纬向流。尽管在时均纬向速度场中几乎到处都可以找到交替的纬向流，但它们的子午尺度因地区而异。在亚极西部边界区域，高能涡旋活动引起准二维湍流，交替的纬​​向流是由逆能量级联产生的，并被罗斯比波拦截，流的子午尺度与莱茵斯尺度相当。在盆地东部，以正压盆地模式为主，通过盆地模式的非线性效应形成了带状结构，其宽度大于莱茵河规模。两种效应都可能在两个区域之间形成区域结构。这些结果表明，Rossby盆地模式不仅成为封闭的盆地中交替地带流动形成的重要因素，而且还阻止了Ros​​sby波逆向能量级联的捕获。与涡流活动相关的以风为动力的一般环流在确定每个区域可能发生交替的纬向流的机制中起着至关重要的作用。

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