| 末次间冰期东亚季风气候不稳定的神农架洞穴石笋记录 |
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| 引用本文： | 姜修洋,汪永进,孔兴功,陈仕涛,李明霞,程海.末次间冰期东亚季风气候不稳定的神农架洞穴石笋记录[J].沉积学报,2008,26(1):139-143. |
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| 作者姓名： | 姜修洋 汪永进 孔兴功 陈仕涛 李明霞 程海 |
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| 作者单位： | 南京师范大学;南京师范大学;南京师范大学;南京师范大学;南京师范大学 |
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| 基金项目： | 全国优秀博士学位论文作者专项资金(批准号:200227)，国家杰出青年科学基金(批准号:40225007)，江苏省研究生培养创新工程(编号:CX07B-0512) |
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| 摘 要： | 基于神农架永兴洞石笋(YX21)4个230 Th年龄和303个δ18O测试数据,建立了东亚季风末次间冰期持续时间约2 ka(127.32±1.23～124.95±1.16 ka BP)的洞穴石笋高分辨率δ18O的时间序列。该洞穴末次间冰期δ18O变化曲线表现出高频振荡特征,表明东亚季风末次间冰期降水的不稳定性,并识别出该时段4个季风冷事件,这种冷事件可能与北大西洋冰漂碎屑事件有关。谱分析结果显示百年和十年际尺度的季风降水变化响应于太阳活动周期。
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| 关 键 词： | 神农架 末次间冰期 石笋 不稳定性 |
| 文章编号： | 1000-0550（2008）01-0139-05 |
| 收稿时间： | 2007-03-14 |
| 修稿时间： | 2007-04-12 |
Climate Variability in Shennongjia During the Last Interglacial Inferred from a High-resolution Stalagmite Record |
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| JIANG Xiu-yang,WANG Yong-jin,KONG Xing-gong,CHEN Shi-tao,LI Ming-xia,CHENG Hai.Climate Variability in Shennongjia During the Last Interglacial Inferred from a High-resolution Stalagmite Record[J].Acta Sedimentologica Sinica,2008,26(1):139-143. |
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| Authors: | JIANG Xiu-yang WANG Yong-jin KONG Xing-gong CHEN Shi-tao LI Ming-xia CHENG Hai |
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| Abstract: | Speleothem studies have the potential to considerably improve our knowledge of climate changes of the past 500 000 a. Above all, this is due to the independent and reliable calendar year chronology provided by uranium series dating techniques and to the multitude of paleoclimate proxy records preserved in speleothems. Here we present an absolute dated and high resolution stable oxygen record from a stalagmite（No.YX21）in Yongxing Cave, Shennongjia natural reservation, central China, giving the details on climatic fluctuations during the Last Interglacial periods. Based on 4 230Th dates and 303 oxygen isotope data, an averaged 8 a East Asian Monsoon precipitation series was established through 127.32 to 124.95 thousand years before present (ka BP). This detailed record uncovered that the δ18O have the high frequency variability characteristic, indicating the instability of the East Asian Monsoon during the Last Interglacial. During this interval, the YX21 record has 4 Asian Monsoon weak events, possibly related to the interglacial ice rafting events in the North Atlantic. Power spectral analysis of the record shows statistically significant periodicities centered on 661 a，127 a，118 a，19~22 a. These periodicities are close to significant periods of the δ14C record, indicates that solar changes are also responsible for changes of Asian Monsoon intensity. |
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| Keywords: | Shennongjia the Last Interglacial stalagmite instability |
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