A high‐resolution monsoon record of millennial‐scale oscillations during Late MIS 3 from Wulu Cave, south‐west China
A high‐resolution monsoon record of millennial‐scale oscillations during Late MIS 3 from Wulu Cave, south‐west China
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DOI：
10.1002/jqs.2681
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发表时间：
2014-01
影响因子：
2.3
通讯作者：
F. Duan;Dianbing Liu;Hai Cheng;Xianfeng Wang;Yongjin Wang;X. Kong;Shitao Chen
中科院分区：
文献类型：
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作者：
F. Duan;Dianbing Liu;Hai Cheng;Xianfeng Wang;Yongjin Wang;X. Kong;Shitao Chen
中国西南部的洞穴群记录详细地刻画了亚洲季风强度从39.3ka到28.7ka的千年尺度变化。方解石δ18O剖面的平均分辨率为∼8年，它显示了几个与格陵兰间期8-4同时发生的强季风事件。为了系统地观察AM千年尺度的变化，将来自同一洞穴的新的和以前报道的数据结合在一起，表明AM的变化与格陵兰冰川δ18O记录和南极洲表现出广泛的相似之处，但在相反的意义上。然而，在包含GIS5和GIS4.1的区间内，我们的石笋δ18O记录描绘了持续的强季风，在这些间期之间没有明显的振荡。我们记录的另一个显著特征是逐渐过渡到中国大陆间(CIS)8，这很好地受到每年一次的层序的制约。我们发现，季风强度的初始增强持续了几个世纪，显著先于独联体8在AM领域的突然爆发。这表明，当海洋/大气环流的快速重组超过一个临界点时，大气的水汽和热量输送可能会导致气候突然变化。
A speleothem record from south‐western China characterizes in detail the millennial‐scale changes in Asian Monsoon (AM) intensity from 39.3 to 28.7 ka. The calcite δ18O profile, with an average resolution of ∼8 years, shows several strong monsoon events concurrent with Greenland Interstadials (GIS) 8–4. To gain a systematic perspective of AM millennial‐scale variability, the new and previously reported data from the same cave are combined, showing that AM variation exhibits a broad similarity with Greenland ice δ18O records and with Antarctica but in an opposite sense. For the interval that encompasses GIS 5 and GIS 4.1, however, our stalagmite δ18O record depicts a sustained strong monsoon with no distinctive oscillation between these interstadials. Another prominent characteristic in our record is a gradual transition into Chinese Interstadial (CIS) 8, which is well constrained by an annually laminated sequence. We find that an initial rise in monsoon intensity, lasting a few centuries, significantly precedes the abrupt onset of CIS 8 in the AM realm. This suggests that atmospheric moisture and heat transport are probably capable of inducing abrupt climate change when a rapid reorganization of ocean/atmosphere circulations passes a tipping point.