Internal and external forcing of multidecadal Atlantic climate variability over the past 1,200 years

Internal and external forcing of multidecadal Atlantic climate variability over the past 1,200 years
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过去1200年大西洋数十年气候变化的内部和外部强迫

DOI:
10.1038/ngeo2962
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发表时间:
2017-05
期刊:
影响因子:
18.3
通讯作者:
Eduardo Zorita
Eduardo Zorita
中科院分区:
地球科学1区
文献类型:
--
作者:
Jianglin Wang;Bao Yang;Fredrik Charpentier Ljungqvist;Juerg Luterbacher;Timothy J. Osborn;Keith R. Briffa;Eduardo Zorita

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北大西洋的气候变率是在几十年尺度上变化的,有时也被称为大西洋气候变率。然而,诸如太阳辐照度或火山活动的变化等外部强迫和内部动力学对这些变化的相对贡献尚不清楚。在这里,我们提供的证据持续夏季大西洋。从公元800年至2010年,每年解决陆地代理记录从环北大西洋地区的网络。我们发现,大规模的火山爆发和太阳辐射极小值导致了大西洋年代际变率的冷相,在大于30年的时间尺度上,它们共同解释了约30%的重建方差。然后,我们能够分离出大西洋年代际变率的内部生成分量define.as。我们还发现,在大西洋年代际变率的重建中,大西洋年代际振荡的贡献率最大,它是大西洋年代际振荡的主要贡献者。我们还发现,在大西洋年代际振荡的重建中,大西洋年代际变率的贡献率最大,它是大西洋年代际振荡的主要贡献者我们还确定了大西洋年代际振荡和北方半球温度变化之间的一致性,从而得出结论,大西洋年代际变化和区域到半球气候之间的明显联系并不仅仅来自对外部驱动因素的共同响应,而是反映了动态过程。
The North Atlantic experiences climate variability on multidecadal scales, which is sometimes referred to as Atlantic.multidecadal variability. However, the relative contributions of external forcing such as changes in solar irradiance or volcanic.activity and internal dynamics to these variations are unclear. Here we provide evidence for persistent summer Atlantic.multidecadal variability from AD 800 to 2010 using a network of annually resolved terrestrial proxy records from the circum-.North Atlantic region. We find that large volcanic eruptions and solar irradiance minima induce cool phases of Atlantic.multidecadal variability and collectively explain about 30% of the variance in the reconstruction on timescales greater than.30 years.We are then able to isolate the internally generated component of Atlantic multidecadal variability, which we define.as the Atlantic multidecadal oscillation.We find that the Atlantic multidecadal oscillation is the largest contributor to Atlantic.multidecadal variability over the past 1,200 years.We also identify coherence between the Atlantic multidecadal oscillation.and Northern Hemisphere temperature variations, leading us to conclude that the apparent link betweenAtlantic multidecadal.variability and regional to hemispheric climate does not arise solely from a common response to external drivers, and may.instead reflect dynamic processes.
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