The deep eastern boundary current (DEBC) in the southeast Atlantic Ocean plays an important role in the global meridional overturning circulation, by carrying a comparable fraction of the North Atlantic Deep Water transport toward the Southern Ocean to that of the deep western boundary current. At the same time, the southeast Atlantic Ocean is constantly influenced by energetic Agulhas rings that are shedded by the Agulhas current. It has been pointed out that the eddy thickness transport by these Agulhas rings is important in enabling the deep water mass that flows southeastward within the interior of the South Atlantic Ocean to cross isolines of large scale potential vorticity toward the eastern boundary where it feeds the DEBC. In this work, we focus on the dynamics of DEBC itself which carries this water mass into the Southern Ocean. We use idealized general circulation model configurations to study the relationship between the Agulhas rings, bathymetry and the southward DEBC in southeast Atlantic Ocean. We find that a DEBC comparable to that in observations and state estimate products is obtained only with combined forcing by Agulhas rings and a sloping bathymetry. The DEBC is then characterized by a mid-depth core at a 2.2 km, again similar to observations. We analyze the momentum and vorticity budgets of the DEBC and show that it is driven by vortex stretching that is sensitive to both eddy temperature transport and the bottom slope.

东南大西洋的深部东部边界流（DEBC）在全球经向翻转环流中发挥着重要作用，它携带着与西部深部边界流相当一部分的北大西洋深水输送到南大洋。同时，大西洋东南部不断受到厄加勒斯洋流脱落的高能厄加勒斯环的影响。已经指出，这些 Agulhas 环的涡流厚度传输对于使在南大西洋内部向东南流动的深水团能够跨越大规模潜在涡度的等值线向东部边界注入 DEBC 很重要. 在这项工作中，我们关注 DEBC 本身的动力学，它将这些水团带入南大洋。我们使用理想化的环流模型配置来研究东南大西洋的厄加勒斯环、测深和南向 DEBC 之间的关系。我们发现只有通过 Agulhas 环和倾斜水深测量的联合强迫才能获得与观测和状态估计产品相当的 DEBC。DEBC 然后以 2.2 公里处的中等深度核心为特征，同样与观测结果相似。我们分析了 DEBC 的动量和涡度收支，并表明它是由对涡流温度传输和底部斜率敏感的涡旋拉伸驱动的。我们发现只有通过 Agulhas 环和倾斜水深测量的联合强迫才能获得与观测和状态估计产品相当的 DEBC。DEBC 然后以 2.2 公里处的中等深度核心为特征，同样与观测结果相似。我们分析了 DEBC 的动量和涡度收支，并表明它是由对涡流温度传输和底部斜率敏感的涡旋拉伸驱动的。我们发现只有通过 Agulhas 环和倾斜水深测量的联合强迫才能获得与观测和状态估计产品相当的 DEBC。DEBC 然后以 2.2 公里处的中等深度核心为特征，同样与观测结果相似。我们分析了 DEBC 的动量和涡度收支，并表明它是由对涡流温度传输和底部斜率敏感的涡旋拉伸驱动的。