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首页> 外文期刊>Journal of Physical Oceanography >Sources of the Equatorial Undercurrent in the Atlantic in a High-Resolution Ocean Model
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Sources of the Equatorial Undercurrent in the Atlantic in a High-Resolution Ocean Model

机译：高分辨率海洋模型中大西洋赤道暗流的来源

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摘要

The ventilation of the Equatorial Undercurrent (EUC) in the Atlantic is investigated using data from a high-resolution ocean model. Overturning streamfunctions, subduction patterns, and pathways are determined from Eulerian and Lagrangian mean transports. The role of high-frequency variability is highlighted. The meridional overturning circulation shows that the EUC is mainly ventilated from the south. This is seen because transports induced by high-frequency variability compensate for tropical cells that are associated with downwelling at 5°poleward of the equator and upwelling at the equator. The impact of high-frequency variability is large, especially to the north of the equator. Lagrangian trajectory analysis shows that the main subduction sites that ventilate the EUC are located along the South Equatorial Current: one region in the southwest and one in the central subtropical South Atlantic. From these sites water masses transfer toward the western boundary. Following the boundary they finally enter the EUC. A small portion of water in the EUC originates from a region along the North Equatorial Current (NEC). These water masses follow mainly a pathway through the interior of the basin toward the EUC. Seasonal variations in the mixed layer depth lead to spreading subduction sites. High-frequency transport variations act to reduce subduction in the western Tropics and shift the subduction region along the NEC toward the northeast.
机译：使用高分辨率海洋模型的数据研究了大西洋赤道暗流（EUC）的通风情况。根据欧拉和拉格朗日平均运移确定倾覆的河流功能，俯冲模式和途径。突出了高频可变性的作用。经向翻转循环表明EUC主要从南方通风。可以看出，这是因为由高频变化引起的传输补偿了与在赤道5°极处的下沉和在赤道上的上升有关的热带细胞。高频变化的影响很大，尤其是在赤道以北。拉格朗日轨迹分析表明，使EUC通风的主要俯冲点位于赤道南流沿线：西南一个区域和中亚热带南大西洋一个区域。水团从这些地点向西边界转移。沿着边界，他们终于进入了EUC。 EUC中的一小部分水来自北赤道海流（NEC）的区域。这些水团主要遵循通过盆地内部通往EUC的路径。混合层深度的季节性变化导致俯冲位点扩散。高频传输变化的作用是减少热带北部的俯冲，并使俯冲区域沿NEC向东北移动。

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