Does the sensitivity of Southern Ocean circulation depend upon bathymetric details?
Does the sensitivity of Southern Ocean circulation depend upon bathymetric details?
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DOI：
10.1098/rsta.2013.0050
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发表时间：
2014-07-13
期刊：
影响因子：
5
通讯作者：
Munday, David R.
中科院分区：
文献类型：
--
作者：
Hogg, Andrew McC.;Munday, David R.
主要洋流对风应力强迫变化的响应被用一系列理想化的、但允许涡流的模式模拟来研究。此前，表面上类似的模型显示，海洋对不断变化的风应力强迫的反应存在相当大的差异。结果表明，模型灵敏度差异的一个主要原因是对理想水深的微妙修正。关键的水深参数是在绕极洋流中产生的强涡流与底水形成过程相互作用的程度。增加一个海湾，将底层水的形成与经向涡流隔绝，起到稳定深海密度的作用，并增强了绕极流的敏感性。因此，南大洋涡旋和南极大陆架过程之间的相互作用程度可能控制南大洋对变化的敏感性。
The response of the major ocean currents to changes in wind stress forcing is investigated with a series of idealized, but eddy-permitting, model simulations. Previously, ostensibly similar models have shown considerable variation in the oceanic response to changing wind stress forcing. Here, it is shown that a major reason for these differences in model sensitivity is subtle modification of the idealized bathymetry. The key bathymetric parameter is the extent to which the strong eddy field generated in the circumpolar current can interact with the bottom water formation process. The addition of an embayment, which insulates bottom water formation from meridional eddy fluxes, acts to stabilize the deep ocean density and enhances the sensitivity of the circumpolar current. The degree of interaction between Southern Ocean eddies and Antarctic shelf processes may thereby control the sensitivity of the Southern Ocean to change.