A high-resolution pollen record from East China reveals large climate variability near the Northgrippian-Meghalayan boundary (around 4200 years ago) exerted societal influence
A high-resolution pollen record from East China reveals large climate variability near the Northgrippian-Meghalayan boundary (around 4200 years ago) exerted societal influence
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来自中国东部的高分辨率花粉记录揭示了北格里普阶-梅加拉亚边界附近（约4200年前）的巨大气候变化产生了社会影响
DOI：
10.1016/j.palaeo.2018.07.031
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发表时间：
2018-12-26
影响因子：
3
通讯作者：
Cui, Qiao-Yu
中科院分区：
文献类型：
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作者：
Li, Chun-Hai;Li, Yong-Xiang;Cui, Qiao-Yu
大约4200年前发生的大规模、快速的气候变化事件（以下称为标志着梅加拉亚阶段开始的4.2-kyr事件）是全新世最显着的气候异常之一。它可能在全球范围内产生了深远的社会影响；然而，其触发机制仍不确定。在这里，我们展示了来自中国东部天螺山考古遗址的这一时期的高分辨率、日期明确的花粉记录。我们的结果表明，该事件期间研究区域的水文气候条件与现代厄尔尼诺-南方涛动（ENSO）的区域表现惊人地相似，并且表现出从大约到年代际ENSO的类似变化。 4.50 至 4.00 卡路里血压。此外，我们的花粉数据表明，类似 ENSO 的气候变化的强度和频率从大约 2000 年左右明显转向总体增加的强度和频率。 4.50至4.30卡吉尔BP，紧随其后的是以稻米为基础的农业的衰落，这为气候恶化与大约4200年前中国东部新石器时代文明的崩溃之间的因果关系提供了直接证据。这一观测结果与根据热带太平洋代理记录重建的增强的 ENSO 变化一致。由于ENSO与亚洲夏季风和热带辐合带（ITCZ）密切相关，我们认为类似ENSO的气候变率增强可能引发了4.2-kyr事件。
The large and rapid climate change event that occurred around 4200 years ago (hereafter the 4.2-kyr event that marks the onset of the Meghalayan stage) is one of the most significant climatic anomalies in the Holocene. It may have exerted profound societal impact globally; however, its triggering mechanism remains uncertain. Here we present a high-resolution, well-dated pollen record covering this interval from the Tianluoshan archaeological site in East China. Our results show that the hydroclimatic conditions in the study area across this event strikingly resembled the regional expression of modern El Nifio-Southem Oscillation (ENSO) and exhibited in-terdecadal ENSO-like variability from ca. 4.50 to 4.00 cal kyr BP. Also, our pollen data indicate a marked shift toward an overall increased intensity and frequency of ENSO-like climate variability from ca. 4.50 to 4.30 cal kyr BP, which was immediately followed by a decline of rice-based agriculture, providing direct evidence for the causal link between climate deterioration and the collapse of Neolithic civilization in East China some 4200 years ago. This observation is in accord with the enhanced ENSO variability reconstructed from proxy records in the tropical Pacific Ocean. As ENSO is intimately coupled with the Asian summer monsoon and the Intertropical Convergent Zone (ITCZ), we suggest that the enhanced ENSO-like climate variability may have triggered the 4.2-kyr event.