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首页> 外文期刊>Journal of Physical Oceanography >Asymmetry of an Equilibrated Gulf Stream-Type Jet over Topographic Slope
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Asymmetry of an Equilibrated Gulf Stream-Type Jet over Topographic Slope

机译：地形坡度上平衡的湾流式射流的不对称性

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摘要

The symmetry properties of the Gulf Stream-type jet equilibrated over topographic slope are investigated in a series of idealized numerical experiments. A baroclinically unstable zonal jet equilibrates over a sloping bottom through the process of potential vorticity (PV) homogenization underneath the main thermocline by the bottom-intensified eddy activity associated with the stream meandering. Potential vorticity homogenization underneath the main thermocline leads to formation of recirculation gyres on both sides of the jet. The magnitude of the northern recirculation gyre, as measured by its westward transport, is larger than the magnitude of the southern recirculation gyre. This asymmetry in recirculations is shown to be the result of an asymmetric PV mixing underneath the thermocline produced by an asymmetric jet. In particular, the lateral shift of the velocity maximum near the surface relative to the velocity maximum at depth is shown to be responsible for the asymmetry. The results are related to the Gulf Stream data between 73° and 65°W.
机译：在一系列理想的数值实验中，研究了在地形坡度上达到平衡的墨西哥湾流型射流的对称性。通过与水流蜿蜒相关的底部增强涡流活动，主温跃层下的潜在涡度（PV）均质化过程，斜压不稳定的纬向射流在倾斜的底部上达到平衡。主温跃层下的潜在涡度均质化导致射流两侧形成回流环。通过向西的运输来测量，北部回旋涡的幅度大于南部回旋涡的幅度。循环中的这种不对称性是由于在不对称射流产生的温跃层下不对称PV混合而导致的。特别地，在表面附近的最大速度相对于在深处的最大速度的横向偏移被显示为造成不对称的原因。结果与73°和65°W之间的墨西哥湾流数据有关。

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