Evidence for external forcing of the Atlantic Multidecadal Oscillation since termination of the Little Ice Age.

Evidence for external forcing of the Atlantic Multidecadal Oscillation since termination of the Little Ice Age.
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DOI:
10.1038/ncomms4323
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发表时间:
2014-02-25
影响因子:
16.6
通讯作者:
Olsen, Jesper
Olsen, Jesper
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Knudsen, Mads Faurschou;Jacobsen, Bo Holm;Seidenkrantz, Marit-Solveig;Olsen, Jesper

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大西洋年代际振荡(AMO)代表了北方半球气候的一个重要驱动因素,但对AMO的强迫机制仍然知之甚少。在这里,我们使用现有的代理记录调查的影响,太阳和火山强迫的AMO在过去的~450年。证据表明,外部强迫在小冰期(LIA;约)结束后的AMO起搏中发挥了主导作用。1400-1800年),对中纬度海面温度的瞬时影响在随后的5年内蔓延到整个北大西洋。相反,在LIA期间,外部强迫的作用更加模糊。我们的研究进一步表明,大西洋经向翻转环流是重要的外部强迫与北大西洋海面温度,一个猜想,调和两个对立的理论有关的AMO的起源。 大西洋年代际振荡强烈影响北方半球气候,但其主要驱动因素知之甚少。Knudsen等人分析了过去~450年的代理记录,表明自小冰期结束以来,外部强迫一直主导着振荡的控制。
The Atlantic Multidecadal Oscillation (AMO) represents a significant driver of Northern Hemisphere climate, but the forcing mechanisms pacing the AMO remain poorly understood. Here we use the available proxy records to investigate the influence of solar and volcanic forcing on the AMO over the last ~450 years. The evidence suggests that external forcing played a dominant role in pacing the AMO after termination of the Little Ice Age (LIA; ca. 1400–1800), with an instantaneous impact on mid-latitude sea-surface temperatures that spread across the North Atlantic over the ensuing ~5 years. In contrast, the role of external forcing was more ambiguous during the LIA. Our study further suggests that the Atlantic Meridional Overturning Circulation is important for linking external forcing with North Atlantic sea-surface temperatures, a conjecture that reconciles two opposing theories concerning the origin of the AMO. The Atlantic Multidecadal Oscillation strongly influences Northern Hemisphere climate, yet its primary driver is poorly understood. Knudsen et al. analyse proxy records from the past ~450 years and show that external forcing has dominated control of the oscillation since the termination of the Little Ice Age.
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