当前位置：
X-MOL 学术
›
Paleoceanogr. Paleoclimatol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Atlantic Meridional Overturning Circulation and δ13C Variability During the Last Interglacial
Paleoceanography and Paleoclimatology ( IF 3.5 ) Pub Date : 2020-05-12 , DOI: 10.1029/2019pa003818 A. Kessler 1 , N. Bouttes 2 , D. M. Roche 2, 3 , U. S. Ninnemann 4 , E. V. Galaasen 4 , J. Tjiputra 1
Paleoceanography and Paleoclimatology ( IF 3.5 ) Pub Date : 2020-05-12 , DOI: 10.1029/2019pa003818 A. Kessler 1 , N. Bouttes 2 , D. M. Roche 2, 3 , U. S. Ninnemann 4 , E. V. Galaasen 4 , J. Tjiputra 1
Affiliation
The Atlantic Meridional Overturning Circulation (AMOC) is thought to be relatively vigorous and stable during Interglacial periods on multimillennial (equilibrium) timescales. However, recent proxy (δ13C benthic) reconstructions suggest that higher frequency variability in deep water circulation may have been common during some interglacial periods, including the Last Interglacial (LIG, 130–115 ka). The origin of these isotope variations and their implications for past AMOC remain poorly understood. Using iLOVECLIM, an Earth system model of intermediate complexity (EMIC) allowing the computation of 
and direct comparison to proxy reconstructions, we perform a transient experiment of the LIG (125–115 ka) forced only by boundary conditions of greenhouse gases and orbital forcings. The model simulates large centennial‐scale variations in the interior 
of the North Atlantic similar in timescale and amplitude to changes resolved by high‐resolution reconstructions from the LIG. In the model, these variations are caused by changes in the relative influence of North Atlantic Deep Water (NADW) and southern source water (SSW) and are closely linked to large (∼50%) changes in AMOC strength provoked by saline input and associated deep convection areas south of Greenland. We identify regions within the subpolar North Atlantic with different sensitivity and response to changes in preformed 
of NADW and to changes in NADW versus SSW influence, which is useful for proxy record interpretation. This could explain the relatively large δ13C gradient (∼0.4%0) observed at ∼3 km water depth in the subpolar North Atlantic at the inception of the last glacial.
中文翻译：
末次冰期之间的大西洋子午向翻转环流和δ13C变异性
人们认为，在跨冰期的千年间（平衡）时间尺度上，大西洋子午向翻转环流（AMOC）是相对活跃和稳定的。然而，最近的代理（δ 13 C ^底栖）重建建议在深水中循环，较高频率的变化可以在一定的间冰期已经屡见不鲜，包括末次间冰期（LIG，130-115 KA）。这些同位素变异的起源及其对过去AMOC的影响仍然知之甚少。使用iLOVECLIM，中度复杂度（EMIC）的地球系统模型可以计算并直接与代理重建进行比较，我们仅通过温室气体的边界条件和轨道强迫对LIG（125–115 ka）进行了瞬态实验。该模型模拟北大西洋内部的大型百年尺度变化，其时间尺度和幅度与LIG高分辨率重建所解决的变化相似。在模型中，这些变化是由北大西洋深水（NADW）和南部水源（SSW）的相对影响的变化引起的，并且与盐分输入及相关引起的AMOC强度的大变化（约50％）密切相关格陵兰以南的深对流地区。我们在北极亚极地区识别具有不同敏感性和对预制岩变化的响应的区域NADW以及NADW与SSW影响之间的变化，这对于代理记录的解释很有用。这可以解释的相对大的δ 13在最后冰开始以来在极地北大西洋在〜3公里水深值C梯度（〜0.4％0）。
更新日期：2020-05-12
and direct comparison to proxy reconstructions, we perform a transient experiment of the LIG (125–115 ka) forced only by boundary conditions of greenhouse gases and orbital forcings. The model simulates large centennial‐scale variations in the interior of the North Atlantic similar in timescale and amplitude to changes resolved by high‐resolution reconstructions from the LIG. In the model, these variations are caused by changes in the relative influence of North Atlantic Deep Water (NADW) and southern source water (SSW) and are closely linked to large (∼50%) changes in AMOC strength provoked by saline input and associated deep convection areas south of Greenland. We identify regions within the subpolar North Atlantic with different sensitivity and response to changes in preformed of NADW and to changes in NADW versus SSW influence, which is useful for proxy record interpretation. This could explain the relatively large δ13C gradient (∼0.4%0) observed at ∼3 km water depth in the subpolar North Atlantic at the inception of the last glacial.
中文翻译：
末次冰期之间的大西洋子午向翻转环流和δ13C变异性
人们认为，在跨冰期的千年间（平衡）时间尺度上，大西洋子午向翻转环流（AMOC）是相对活跃和稳定的。然而，最近的代理（δ 13 C ^底栖）重建建议在深水中循环，较高频率的变化可以在一定的间冰期已经屡见不鲜，包括末次间冰期（LIG，130-115 KA）。这些同位素变异的起源及其对过去AMOC的影响仍然知之甚少。使用iLOVECLIM，中度复杂度（EMIC）的地球系统模型可以计算
并直接与代理重建进行比较，我们仅通过温室气体的边界条件和轨道强迫对LIG（125–115 ka）进行了瞬态实验。该模型模拟北大西洋内部的大型百年尺度变化，其时间尺度和幅度与LIG高分辨率重建所解决的变化相似。在模型中，这些变化是由北大西洋深水（NADW）和南部水源（SSW）的相对影响的变化引起的，并且与盐分输入及相关引起的AMOC强度的大变化（约50％）密切相关格陵兰以南的深对流地区。我们在北极亚极地区识别具有不同敏感性和对预制岩变化的响应的区域NADW以及NADW与SSW影响之间的变化，这对于代理记录的解释很有用。这可以解释的相对大的δ 13在最后冰开始以来在极地北大西洋在〜3公里水深值C梯度（〜0.4％0）。
京公网安备 11010802027423号