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首页> 外文期刊>Journal of Physical Oceanography >Effects of the Asymmetry between Surface and Interior Flow on the Dynamics of a Thermohaline Loop
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Effects of the Asymmetry between Surface and Interior Flow on the Dynamics of a Thermohaline Loop

机译：表面和内部流动之间的不对称性对盐卤环动力学的影响

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摘要

Large-scale overturning cells in the ocean typically combine an essentially horizontal surface branch and an interior branch below, where the circulation spans both horizontal and vertical scales. The aim of this study is to analyze the impact of this asymmetry between the two branches by folding a one-dimensional thermohaline loop, such that its lower part remains vertical while its upper part is folded down into the horizontal plane. It is found that both the transitory response and the distribution of thermohaline properties are modified significantly when the loop is folded. In some cases, velocity oscillations are induced during the spinup that were not seen in the unfolded case. This is because a circular loop allows for compensations between the density torques produced above and below the heat forcing level, while such compensations are not possible in the folded loop because of the horizontal direction of the surface circulation. Furthermore, the dynamical effects associated with nonlinearities of the equation of state are significantly altered by the folding. Cabbeling tends to decelerate the flow in the folded loop, instead of accelerating it as in the circular case, and can also act to dampen velocity oscillations. Thermobaricity also alters the loop circulation, although comparatively less.
机译：海洋中的大型翻转单元通常将基本水平的表面分支和下面的内部分支结合在一起，其中的循环跨越水平和垂直尺度。这项研究的目的是通过折叠一维热盐环来分析两个分支之间这种不对称的影响，以使其下部保持垂直，而其上部向下折叠成水平面。发现当折叠环时，瞬态响应和热盐特性的分布都被显着改变。在某些情况下，在旋转过程中会引起速度振荡，这在展开情况下是看不到的。这是因为圆形回路允许在热强迫水平之上和之下产生的密度转矩之间进行补偿，而由于表面循环的水平方向，这种补偿在折叠回路中是不可能的。此外，与状态方程的非线性相关的动力学效应通过折叠而显着改变。晃动趋向于使折叠回路中的流量减速，而不是像在圆形情况下那样使流量加速，并且还可以起到抑制速度波动的作用。耐温性也改变了回路的循环，尽管相对较少。

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