Multidecadal North Atlantic sea surface temperature and Atlantic meridional overturning circulation variability in CMIP5 historical simulations
Multidecadal North Atlantic sea surface temperature and Atlantic meridional overturning circulation variability in CMIP5 historical simulations
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DOI：
10.1002/jgrc.20390
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发表时间：
2013-10
影响因子：
--
通讯作者：
Liping Zhang;Chunzai Wang
中科院分区：
文献类型：
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作者：
Liping Zhang;Chunzai Wang
2013年5月22日收到；2013年9月4日修订；2013年9月8日接受；2013年10月23日发表。[1] 在本文中，对大西洋多年代际振荡（AMO）和大西洋经向翻转环流（AMOC）的模拟变率及其关系进行了研究。耦合模式比较计划第5阶段（CMIP5）为政府间气候变化专门委员会第五次评估报告（IPCC - AR5）提供的历史模拟气候模式首次被用于此目的。这些模式在多年代际时间尺度带上显示出关于AMO和AMOC的最活跃变率，但在振幅和频率上模型间差异较大。大多数模型中AMO和AMOC之间的关系类似于针对多年代际时间尺度上的AMOC所提出的延迟平流振荡。AMOC的加速（减速）有利于通过上层海洋异常的向北（向南）热量输送产生AMO的暖（冷）相位，这反过来在海洋调整延迟一段时间后通过经向密度梯度的变化导致AMOC减弱（增强）。这表明在多年代际时间尺度上，AMO和AMOC相互关联且相互作用。
Received 22 May 2013; revised 4 September 2013; accepted 8 September 2013; published 23 October 2013. [1] In this paper, simulated variability of the Atlantic Multidecadal Oscillation (AMO) and the Atlantic Meridional Overturning Circulation (AMOC) and their relationship has been investigated. For the first time, climate models of the Coupled Model Intercomparison Project phase 5 (CMIP5) provided to the Intergovernmental Panel on Climate Change Fifth Assessment Report (IPCC-AR5) in historical simulations have been used for this purpose. The models show the most energetic variability on the multidecadal timescale band both with respect to the AMO and AMOC, but with a large model spread in both amplitude and frequency. The relationship between the AMO and AMOC in most of the models resembles the delayed advective oscillation proposed for the AMOC on multidecadal timescales. A speed up (slow down) of the AMOC is in favor of generating a warm (cold) phase of the AMO by the anomalous northward (southward) heat transport in the upper ocean, which reversely leads to a weakening (strengthening) of the AMOC through changes in the meridional density gradient after a delayed time of ocean adjustment. This suggests that on multidecadal timescales the AMO and AMOC are related and interact with each other.