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首页> 外文期刊>Journal of Climate >Can the Salt-Advection Feedback Be Detected in Internal Variability of the Atlantic Meridional Overturning Circulation?
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Can the Salt-Advection Feedback Be Detected in Internal Variability of the Atlantic Meridional Overturning Circulation?

机译：可以在大西洋经络推翻流通的内部变异中检测到盐平面反馈吗？

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摘要

Evidence for the assumptions of the salt-advection feedback in box models is sought by studying the Atlantic meridional overturning circulation (AMOC) internal variability in the long preindustrial control runs of two Earth system models. The first assumption is that AMOC strength is proportional to the meridional density difference between the North Atlantic and the Southern Oceans. The model simulations support this assumption, with the caveat that nearly all the long time-scale variability occurs in the North Atlantic density. The second assumption is that the freshwater transport variability by the overturning at the Atlantic southern boundary is controlled by the strength of AMOC. Only one of the models shows some evidence that AMOC variability at 45 degrees N leads variability in the overturning freshwater transport at the southern boundary by about 30 years, but the other model shows no such coherence. In contrast, in both models this freshwater transport variability is dominated by local salinity variations. The third assumption is that changes in the overturning freshwater transport at the Atlantic southern boundary perturb the north-south density difference, and thus feed back on AMOC strength in the north. No evidence for this assumption is found in either model at any time scale, although this does not rule out that the salt-advection feedback may be excited by a strong enough freshwater perturbation.
机译：通过在两个地球系统模型的长时间预工业控制运行中研究大西洋的经络倾覆循环（AMOC）内部可变性来寻求盒装模型中的盐平面反馈的假设证据。第一个假设是Amoc强度与北大西洋和南海之间的子午密差异成比例。模型仿真支持这种假设，采用警告，即几乎所有长时间的变异在北大西洋密度中发生。第二个假设是大西洋南部边界的翻倒的淡水运输变异是由amoc的强度控制的。只有其中一个模型显示了一些证据表明，45摄氏度的Amoc变异性在南部边界的翻倒淡水运输中导致了大约30年的可变性，但另一个模型显示出没有这样的一致性。相反，在这两种型号中，这种淡水运输可变性是由局部盐度变化的主导。第三个假设是大西洋南部边界扰动南北密度差异的翻倒淡水运输的变化，从而回馈了北方的武器强度。在任何时候都没有发现这种假设的证据，尽管这并不排除盐平面反馈可能会受到足够强烈的淡水扰动的兴奋。

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