| Precise dating of East-Asian-Monsoon D/O events during 95―56 ka BP: Based on stalagmite data from Shanbao Cave at Shennongjia, China |
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| 引用本文： | XIA ZhiFeng,KONG XingGong?,JIANG XiuYang & CHENG Hai College of Geographic Science,Nanjing Normal University,Nanjing ,China, Department of Geology and Geophysics,University of Minnesota,MN ,USA.Precise dating of East-Asian-Monsoon D/O events during 95―56 ka BP: Based on stalagmite data from Shanbao Cave at Shennongjia, China[J].中国科学D辑(英文版),2007,50(2):228-235. |
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| 作者姓名： | XIA ZhiFeng KONG XingGong? JIANG XiuYang & CHENG Hai College of Geographic Science Nanjing Normal University Nanjing China |
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| 作者单位： | XIA ZhiFeng1，KONG XingGong1?，JIANG XiuYang1 & CHENG Hai2 1 College of Geographic Science，Nanjing Normal University，Nanjing 210097，China; 2 Department of Geology and Geophysics，University of Minnesota，MN 55455，USA |
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| 基金项目： | Supported by the Foundation for the Author of National Excellent Doctoral Disserta-tion of China (FANEDD, No. 200227)，China National Outstanding Youth Sci-ence Foundation (Grant No. 40225007) |
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| 摘 要： | Based on 23 U/Th analyses and 532 oxygen isotopic data, an averaged 80-a stalagmite oxygen isotopic composition series was established through 95 to 56 thousand years before present (ka BP) from two speleothems in Shanbao Cave, Shennongjia, central China. Shanbao Cave record (referred to as SB record) replicates well with Hulu Cave record, extending the characteristics of millennial oscillations in East-Asian-Summer-Monsoon (EASM) to the past 95 ka. The trend of the SB record generally follows mid-July solar insolation at 65°N, suggesting that mid-high northern latitude insolation, in the first or- der, controls changes of EASM intensity. Millennial oscillations of EASM recorded in the stalagmites are well related to the Greenland interstadials referred to as Dansgaard/Oeschger (D/O) events from 1 to 22, indicating that rapid ocean-atmosphere reorganization in North Atlantic has a remote effect in EASM. The well-dated D/O events by stalagmites probably provide an absolute calibration for chro- nologies of Greenland ice cores. The timings of D/O events in the SB record are different variously from those in Greenland ice cores. For D/O 19 and 20, the age offsets between the stalagmites' and the Greenland ice cores' record are significant, larger than the uncertainties of uranium-series dating. The two events in the SB record are younger than those in North GRIP time scale by 1―2 ka, and older than the counterparts in GISP2 by approximately 3―4 ka. A comparison between the SB and Brazil stalag- mite record shows an anti-phase relation in millennial-scale monsoon precipitation between the two localities. This supports a mode for the coupled ocean-atmosphere "See-saw".
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