Changes in El Niño - Southern Oscillation (ENSO) conditions during the Greenland Stadial 1 (GS-1) chronozone revealed by New Zealand tree-rings
Changes in El Niño - Southern Oscillation (ENSO) conditions during the Greenland Stadial 1 (GS-1) chronozone revealed by New Zealand tree-rings
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新西兰树木年轮揭示格陵兰体育场 1 (GS-1) 时区期间厄尔尼诺 - 南方涛动 (ENSO) 条件的变化
DOI：
10.1016/j.quascirev.2016.10.003
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发表时间：
2016
影响因子：
4
通讯作者：
Palmer J
中科院分区：
文献类型：
--
作者：
Palmer J
末次冰期末的变暖趋势被格陵兰岛（Greenland Stadial 1或GS-1）和欧洲（Younger Dryas Stadial或YD）明显的快速变冷所中断。这种向冰川样条件的逆转是最著名的突变例子之一，但确切的时间和全球空间范围仍不确定。虽然更广泛的大西洋地区拥有跨越GS-1的高分辨率代理记录网络，但太平洋却缺乏亚年代际分辨率序列。在这里，我们报告了对新西兰北部树木年轮年表的调查结果，旨在解决数据缺乏的问题。从当代研究中得知，针叶树物种贝壳杉（Agathis australis）对区域气候变化非常敏感。对452年“历史性”贝壳杉年表的分析证实了通过厄尔Niño -南方涛动（ENSO）的热带-太平洋遥相关。然后，我们将研究重点放在1010年的亚化石贝壳杉年代学上，该年代学已经通过综合放射性碳定年法进行了精确的定年，并且在GS-1中包含了在~ 12,500和12,380 cal BP之间的显着环宽下降。小波分析表明，衰退事件发生后，类似enso的周期性显著增加。与太平洋低纬度和中纬度记录的比较表明，在此期间与ENSO和南半球大气环流变化具有一致性。这一气候事件的驱动因素尚不清楚，但可能与太阳变化有关，太阳变化随后导致ENSO在太平洋中纬度地区的建立和/或增加表达，似乎独立于大西洋和极地地区。
The warming trend at the end of the last glacial was disrupted by rapid cooling clearly identified in Greenland (Greenland Stadial 1 or GS-1) and Europe (Younger Dryas Stadial or YD). This reversal to glacial-like conditions is one of the best known examples of abrupt change but the exact timing and global spatial extent remain uncertain. Whilst the wider Atlantic region has a network of high-resolution proxy records spanning GS-1, the Pacific Ocean suffers from a scarcity of sub-decadally resolved sequences. Here we report the results from an investigation into a tree-ring chronology from northern New Zealand aimed at addressing the paucity of data. The conifer tree species kauri (Agathis australis) is known from contemporary studies to be sensitive to regional climate changes. An analysis of a ‘historic’ 452-year kauri chronology confirms a tropical-Pacific teleconnection via the El Niño – Southern Oscillation (ENSO). We then focus our study on a 1010-year sub-fossil kauri chronology that has been precisely dated by comprehensive radiocarbon dating and contains a striking ring-width downturn between ∼12,500 and 12,380 cal BP within GS-1. Wavelet analysis shows a marked increase in ENSO-like periodicities occurring after the downturn event. Comparison to low- and mid-latitude Pacific records suggests a coherency with ENSO and Southern Hemisphere atmospheric circulation change during this period. The driver(s) for this climate event remain unclear but may be related to solar changes that subsequently led to establishment and/or increased expression of ENSO across the mid-latitudes of the Pacific, seemingly independent of the Atlantic and polar regions.