Millennial- and orbital-scale changes in the East Asian monsoon over the past 224,000 years
Millennial- and orbital-scale changes in the East Asian monsoon over the past 224,000 years
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DOI：
10.1038/nature06692
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发表时间：
2008-02
期刊：
影响因子：
64.8
通讯作者：
Yongjin Wang;Hai Cheng;R. Edwards;X. Kong;X. Shao;Shitao Chen;Jiangying Wu;X. Jiang;Xianfeng Wa
中科院分区：
文献类型：
--
作者：
Yongjin Wang;Hai Cheng;R. Edwards;X. Kong;X. Shao;Shitao Chen;Jiangying Wu;X. Jiang;Xianfeng Wa
来自中国的高分辨率洞穴记录为控制东亚季风强度的因素提供了见解。然而，由于过去两个间冰期-冰期周期的季风历史记录存在空白，我们对这些因素的理解仍然不完整。特别是，缺失的部分阻碍了我们测试有关季风轨道尺度控制、千年尺度事件的原因以及季风变化与其他地区气候之间关系的想法的能力。在这里，我们展示了来自中国中部三宝洞的绝对年代氧同位素记录，该记录完成了基于中国洞穴的过去 224,000 年东亚季风强度的记录。该记录以 23,000 年长的周期为主，这些周期在测年误差内与北纬 65° 的夏季日照同步（参考文献 ），支持热带/亚热带季风对北半球夏季日照在轨道时间尺度上的变化产生主要和直接反应的观点。这些周期被千禧年规模的强夏季季风事件（中国间质事件）打断，新的记录使我们能够识别过去两个间冰期-冰期周期中这些事件的完整系列。在末次冰期和倒数第二次冰期的冰川形成过程中，它们的持续时间减少，频率增加，这表明冰盖的大小影响它们的特征和节奏。事件的发生时间受到特别严格的限制，因此可以作为关联和校准气候记录的基准。
High-resolution speleothem records from China have provided insights into the factors that control the strength of the East Asian monsoon,,,. Our understanding of these factors remains incomplete, however, owing to gaps in the record of monsoon history over the past two interglacial–glacial cycles. In particular, missing sections have hampered our ability to test ideas about orbital-scale controls on the monsoon,,, the causes of millennial-scale events,and relationships between changes in the monsoon and climate in other regions. Here we present an absolute-dated oxygen isotope record from Sanbao cave, central China, that completes a Chinese-cave-based record of the strength of the East Asian monsoon that covers the past 224,000 years. The record is dominated by 23,000-year-long cycles that are synchronous within dating errors with summer insolation at 65° N (ref. ), supporting the idea that tropical/subtropical monsoons respond dominantly and directly to changes in Northern Hemisphere summer insolation on orbital timescales. The cycles are punctuated by millennial-scale strong-summer-monsoon events (Chinese interstadials), and the new record allows us to identify the complete series of these events over the past two interglacial–glacial cycles. Their duration decreases and their frequency increases during glacial build-up in both the last and penultimate glacial periods, indicating that ice sheet size affects their character and pacing. The ages of the events are exceptionally well constrained and may thus serve as benchmarks for correlating and calibrating climate records.