Research School of Earth Sciences and ARC Centre of Excellence for Climate System Science, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Philos Trans A Math Phys Eng Sci. 2014 Jul 13;372(2019):20130050. doi: 10.1098/rsta.2013.0050.
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.
利用一系列理想化但允许涡旋的模式模拟，研究了主要海洋流对风应力强迫变化的响应。先前，表面上相似的模型表明，海洋对变化的风应力强迫的响应存在很大差异。在这里，表明造成这些模型敏感性差异的一个主要原因是对理想化海底地形的微妙修改。关键的海底地形参数是极地环流年中生成的强涡旋场与底层水形成过程相互作用的程度。一个海湾的加入，使底层水的形成与经向涡通量隔离，从而稳定了深海密度，并增强了极地环流年的敏感性。南大洋涡旋与南极大陆架过程之间的相互作用程度可能因此控制着南大洋对变化的敏感性。
