Tracking the Atlantic Multidecadal Oscillation through the last 8,000 years.

Tracking the Atlantic Multidecadal Oscillation through the last 8,000 years.
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DOI:
10.1038/ncomms1186
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发表时间:
2011-02-01
影响因子:
16.6
通讯作者:
Kuijpers A
Kuijpers A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Knudsen MF;Seidenkrantz MS;Jacobsen BH;Kuijpers A

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了解海洋内部的变化及其对气候的影响对社会来说是必不可少的。一个关键方面涉及神秘的大西洋多年代际振荡(AMO),这是北大西洋海面温度60至90年变化的特征。AMO的性质和起源是不确定的,也不知道它是气候系统中一个持续的周期性驱动因素,还是仅仅是一个短暂的特征。在这里,我们表明,在过去8000年里,北大西洋-大气变化具有明显的~ 55- 70年振荡特征。我们检验并否定了这种气候振荡是由太阳活动的周期性变化直接造成的假设。因此,我们推测,在全新世的大部分时间里,存在一个准持续的~ 55- 70年的AMO,与内部海洋-大气变率有关。我们的分析进一步表明,从AMO到区域气候条件的耦合是由轨道引起的大尺度海洋-大气环流变化调制的。大西洋多年代际振荡是海面温度的一种半周期性变化,其起源尚不清楚。Knudsen等人表明,在过去的8000年里,55年至70年的气候振荡存在,这表明大西洋多年代际振荡是由海洋内部变率引起的全新世气候的永久特征。
Understanding the internal ocean variability and its influence on climate is imperative for society. A key aspect concerns the enigmatic Atlantic Multidecadal Oscillation (AMO), a feature defined by a 60- to 90-year variability in North Atlantic sea-surface temperatures. The nature and origin of the AMO is uncertain, and it remains unknown whether it represents a persistent periodic driver in the climate system, or merely a transient feature. Here, we show that distinct, ∼55- to 70-year oscillations characterized the North Atlantic ocean-atmosphere variability over the past 8,000 years. We test and reject the hypothesis that this climate oscillation was directly forced by periodic changes in solar activity. We therefore conjecture that a quasi-persistent ∼55- to 70-year AMO, linked to internal ocean-atmosphere variability, existed during large parts of the Holocene. Our analyses further suggest that the coupling from the AMO to regional climate conditions was modulated by orbitally induced shifts in large-scale ocean-atmosphere circulation. The origin of the Atlantic Multidecadal Oscillation, a semi-periodic variability of sea-surface temperature, is unknown. Knudsen et al. show that 55- to 70-year climate oscillations existed throughout the last 8,000 years, suggesting that the Atlantic Multidecadal Oscillation is a permanent feature of the Holocene climate induced by internal ocean variability.
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