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Variability of the meridional overturning circulation of the North Atlantic: sensitivity to overflows of dense water masses

机译：北大西洋经向翻转环流的变化：对稠密水团溢出的敏感性

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摘要

A numerical model of the Atlantic Ocean was used to study the low-frequency variability of meridional transports in the North Atlantic. The model shows a behaviour similar to those used in previous studies, and the temporal variability of certain variables compares favourably to observed time series. By changing the depth and width of the sills between the subpolar North Atlantic and the Nordic Seas, the mean horizontal and overturning circulation as well as some water mass properties are modified significantly. The reaction of meridional oceanic transports to atmospheric forcing fluctuations remains, however, unchanged. The critical role of the surface heat flux retroaction term for the meridional heat transport in stand-alone ocean models is discussed. The experiments underline the role of atmospheric variability for fluctuations of the large-scale ocean circulation on time scales from years to decades, and they support the hypothesis that the mean overturning strength is controlled by the model representation of the density of the overflow water masses.
机译：大西洋的数值模型用于研究北大西洋子午线传输的低频变化。该模型显示出与先前研究中使用的行为类似的行为，并且某些变量的时间变异性优于观察到的时间序列。通过改变亚极北大西洋和北欧海之间的门槛的深度和宽度，平均水平和翻转环流以及一些水团性质得到了显着改善。经向海洋输送对大气强迫波动的反应仍然没有改变。讨论了表面热通量追溯项对独立海洋模型中子午热传输的关键作用。实验强调了大气变化对大规模海洋环流从数年到数十年的时间尺度波动的作用，并且它们支持以下假设：平均倾覆强度由溢流水团密度的模型表示控制。

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