| Abrupt climate change of EastAsian Monsoon at 130 kaBP inferred from a high resolu-tion stalagmite δ18O record |
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| 作者姓名： | JIANG Xiuyang WANG Yongjin KONG Xinggong WU Jiangying SHAO Xiaohua XIA Zhifeng CHENG Hai |
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| 作者单位： | [1]College of Geography Science, Nanjing Normal University, Nanjing 210097, China [2]Department of Geology and Geophysics, University of Minnesota,Minneapolis, MN 55455, USA |
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| 基金项目： | Acknowledgements This work was supported by National Excellent Doctoral Dissertation of China （Grant No. 200227） and the National 0utstanding Youth Foundation of China （Grant No. 40225007）. |
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| 摘 要： | ^230Th ages and oxygen isotope data of a stalagmite from Shanbao Cave in Hubei Province characterize the East Asian Monsoon precipitation from 133 to 127ka. The decadal-scale high-resolution δ^18O record reveals a detailed transitional process from the Penultimate Glaciation to the Last Interglaciation. As established with ^230Th dates, the age of the Termination Ⅱ is determined to be 129.5±1.0 kaBP, which supports the Northern Hemisphere insolation as the triggers for the ice-age cycles. In our δ^18O record, the glacial/interglacial fluctuation reaches about 4‰, almost the same level as in other Asian Monsoon cave stalagmite δ^18O records. The transition of the glacial/interglacial period in our record can be recognized as four stepwise stages, among which, a rapid rise of monsoon precipitation follows the stage of “Termination Ⅱ pause”. The rapid rise is synchronous with the abrupt change of global methane concentration, which reflects that an increase in both Asian Monsoon precipitation and tropical wetland plays an important role in the global climate changes.
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| 关 键 词： | 东亚季风 降雨量 气候变化 石笋 氧同位素 U/Th测年 |
| 收稿时间： | 2005-05-19 |
| 修稿时间： | 2005-05-192005-07-19 |
Abrupt climate change of East Asian Monsoon at 130 kaBP inferred from a high resolution stalagmite δ18O record |
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| JIANG Xiuyang WANG Yongjin KONG Xinggong WU Jiangying SHAO Xiaohua XIA Zhifeng CHENG Hai.Abrupt climate change of East Asian Monsoon at 130 kaBP inferred from a high resolution stalagmite δ18O record[J].Chinese Science Bulletin,2005,50(23):2765-2769. |
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| Authors: | Jiang Xiuyang Wang Yongjin Kong Xinggong Wu Jiangying Shao Xiaohua Xia Zhifeng Cheng Hai |
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| Institution: | (1) College of Geography Science, Nanjing Normal University, 10097 Nanjing, China;(2) Department of Geology and Geophysics, University of Minnesota, 5455 Minneapolis, MN, USA |
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| Abstract: | 230Th ages and oxygen isotope data of a stalagmite from Shanbao Cave in Hubei Province characterize the East Asian Monsoon precipitation
from 133 to 127 ka. The decadal-scale high-resolution δ18O record reveals a detailed transitional process from the Penultimate Glaciation to the Last Interglaciation. As established
with230Th dates, the age of the Termination II is determined to be 129.5±1.0 kaBP, which supports the Northern Hemisphere insolation
as the triggers for the ice-age cycles. In our δ18O record, the glacial/ interglacial fluctuation reaches about 4‰, almost the same level as in other Asian Monsoon cave stalagmite
δ18O records. The transition of the glacial/interglacial period in our record can be recognized as four stepwise stages, among
which, a rapid rise of monsoon precipitation follows the stage of “Termination II pause”. The rapid rise is synchronous with
the abrupt change of global methane concentration, which reflects that an increase in both Asian Monsoon precipitation and
tropical wetland plays an important role in the global climate changes. |
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| Keywords: | stalagmite high-resolution U/Th age Termination II |
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