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首页> 外文期刊>Journal of oceanography >Bathymetric influences of the Emperor Seamounts upon the subarctic gyre of the North Pacific: Examining boundary current dynamics along the eastern side of the mountain ridge with an idealized numerical model
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Bathymetric influences of the Emperor Seamounts upon the subarctic gyre of the North Pacific: Examining boundary current dynamics along the eastern side of the mountain ridge with an idealized numerical model

机译：皇帝海山对北太平洋弧下回旋的水深影响：用理想化的数值模型研究山脊东侧的边界流动力学

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摘要

The possible influences of the Emperor Seamounts (ESs) upon the subarctic gyre of the North Pacific (NPSAG) were investigated by a series of numerical experiments. In the experiments, a two-layer ocean with a meridional mountain ridge was forced by seasonally varying wind stress. We focused on how the return ratio, the ratio of the boundary transport along the eastern side of the ridge to the interior Sverdrup transport, changes with ridge height, width and density stratification. It was found that the return ratio can be large if the ridge width is greater than the width of the viscous boundary layer. In this case, the bottom pressure torque determines the return ratio; the return ratio is almost proportional to the ridge height when the ridge height is small and some contours of planetary potential vorticity pass over the ridge. However, the return ratio is independent of the ridge height and decreases with the stratification when the ridge height is large and all the contours of planetary potential vorticity are closed. These dependences of the return ratio were understood in terms of barotropic and baroclinic components of the bottom pressure torque. Implications for the bathymetric influences of ESs on the actual NPSAG are also discussed.
机译：通过一系列数值实验，研究了海皇山（ESs）对北太平洋弧下回旋（NPSAG）的可能影响。在实验中，由季节性变化的风压迫使两层海洋与子午线山脊相连。我们关注的是收益率，即沿山脊东部的边界输运与内部Sverdrup输运的比率如何随山脊的高度，宽度和密度分层而变化。已经发现，如果脊的宽度大于粘性边界层的宽度，则返回率会很大。在这种情况下，底部压力扭矩决定了返回比;当脊高较小并且某些行星势涡度通过脊时，返回率几乎与脊高成正比。但是，返回比与脊高无关，并且当脊高大且行星势涡旋的所有轮廓都闭合时，返回率随分层而减小。从底部压力扭矩的正压分量和斜压分量可以理解返回比的这些依赖性。还讨论了ES的水深影响对实际NPSAG的影响。

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