Paired oxygen isotope records reveal modern North American atmospheric dynamics during the Holocene

Paired oxygen isotope records reveal modern North American atmospheric dynamics during the Holocene
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成对氧同位素记录揭示了全新世现代北美大气动力学

DOI:
10.1038/ncomms4701
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发表时间:
2014-04
影响因子:
16.6
通讯作者:
Fasong Yuan
Fasong Yuan
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Nikolaus H Buenning;Camille Risi;Jeffrey M Welker;Fasong Yuan

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北美太平洋(PNA)遥相关对北美气候有很强的影响。仪器记录和世纪规模的重建表明,自19世纪50年代中期以来,正PNA状态的趋势加速,但对长期PNA变异性知之甚少。在这里,我们重建PNA样的气候变率在全新世中期和晚期使用成对的氧同位素记录从两个地区在北美与强大的,与现代PNA的同位素响应。我们确定的平均状态更负和积极的PNA样气候在全新世中期和晚期,分别。叠加在状态之间的长期变化是一个强大的,准200年的振荡,我们与德弗里斯太阳周期。这些研究结果表明,在整个全新世中期和晚期持续存在的PNA样的气候变化,提供证据的调制PNA在多个时间尺度,并可能帮助研究人员去卷积PNA模式的变化,从其他因素反映在古记录。
The Pacific North American (PNA) teleconnection has a strong influence on North American climate. Instrumental records and century-scale reconstructions indicate an accelerating tendency towards the positive PNA state since the mid-1850s, but much less is known about long-term PNA variability. Here we reconstruct PNA-like climate variability during the mid- and late Holocene using paired oxygen isotope records from two regions in North America with robust, anticorrelated isotopic response to the modern PNA. We identify mean states of more negative and positive PNA-like climate during the mid- and late Holocene, respectively. Superimposed on the secular change between states is a robust, quasi-200-year oscillation, which we associate with the de Vries solar cycle. These findings suggest the persistence of PNA-like climate variability throughout the mid- and late Holocene, provide evidence for modulation of PNA over multiple timescales and may help researchers de-convolve PNA pattern variation from other factors reflected in palaeorecords.
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