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Interglacial instability of North Atlantic Deep Water ventilation
Science ( IF 56.9 ) Pub Date : 2020-03-26 , DOI: 10.1126/science.aay6381
Eirik Vinje Galaasen 1 , Ulysses S. Ninnemann 1 , Augustin Kessler 2 , Nil Irvalı 1 , Yair Rosenthal 3 , Jerry Tjiputra 2 , Nathaëlle Bouttes 4 , Didier M. Roche 4, 5 , Helga (Kikki) F. Kleiven 1 , David A. Hodell 6
Affiliation  

Disrupting deep circulation Atlantic Meridional Overturning Circulation (AMOC) and the related process of North Atlantic Deep Water (NADW) have been thought to be stable during warm, interglacial periods. Galaasen et al. report that episodes of reduced NADW over the past 500,000 years actually have been relatively common and occasionally long-lasting features of interglacials and that they can occur independently of the catastrophic freshwater outburst floods normally thought to be their cause (see the Perspective by Stocker). This discovery implies that large NADW disruptions might be more likely than we have assumed in the warmer climate of the future. Science, this issue p. 1485; see also p. 1425 Large and frequent changes in ocean ventilation during recent interglacial periods were common. Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water δ13C records that span the interglacials of the last 0.5 million years to assess the frequency of and the climatic backgrounds capable of triggering large NADW reductions. Episodes of reduced NADW in the deep Atlantic, similar in magnitude to glacial events, have been relatively common and occasionally long-lasting features of interglacials. NADW reductions were triggered across the range of recent interglacial climate backgrounds, which demonstrates that catastrophic freshwater outburst floods were not a prerequisite for large perturbations. Our results argue that large NADW disruptions are more easily achieved than previously appreciated and that they occurred in past climate conditions similar to those we may soon face.

中文翻译:

北大西洋深水通风的间冰期不稳定性

破坏深环流 大西洋经向翻转环流 (AMOC) 和北大西洋深水 (NADW) 的相关过程被认为在温暖的间冰期是稳定的。加拉森等人。报告说,过去 500,000 年 NADW 减少的事件实际上是间冰期相对普遍且偶尔持久的特征,并且它们可以独立于通常被认为是其原因的灾难性淡水爆发洪水而发生(参见斯托克的观点)。这一发现意味着,在未来气候变暖的情况下,大型 NADW 中断的可能性可能比我们假设的要大。科学,这个问题 p。1485; 另见第 1425 在最近的间冰期,海洋通风的大而频繁的变化很常见。破坏北大西洋深水 (NADW) 通风是气候预测中的一个关键问题。我们使用跨越过去 50 万年间冰期的(亚)百年解析的底水 δ13C 记录来评估能够引发 NADW 大幅减少的频率和气候背景。大西洋深处 NADW 减少的事件与冰川事件的幅度相似,是间冰期相对常见且偶尔持久的特征。NADW 减少是在最近的间冰期气候背景范围内触发的,这表明灾难性的淡水爆发洪水不是大扰动的先决条件。
更新日期:2020-03-26
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