1] Tianjin Key Laboratory of Water Resource and Environment, Tianjin Normal University, Tianjin 300387, China [2] Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8568, Japan.
Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8568, Japan.
Nat Commun. 2014 Apr 16;5:3701. doi: 10.1038/ncomms4701.
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.
北太平洋北美（PNA）遥相关对北美气候有很强的影响。仪器记录和世纪尺度的重建表明，自 19 世纪中叶以来，正向 PNA 状态的加速趋势，但关于长期 PNA 变率的了解要少得多。在这里，我们使用来自北美的两个地区的配对氧同位素记录来重建中全新世和晚全新世的 PNA 样气候变率，这些记录具有与现代 PNA 呈强反相关的同位素响应。我们分别确定了中全新世和晚全新世中更负和更正的 PNA 样气候的平均状态。叠加在状态之间的是一个稳健的、准 200 年的震荡，我们将其与德维里斯太阳周期联系起来。这些发现表明，在整个中全新世和晚全新世期间，PNA 样气候变率持续存在，为 PNA 在多个时间尺度上的调制提供了证据，并可能有助于研究人员从古记录中反映的其他因素中解卷积 PNA 模式变化。
