| A 16 ka climate record deduced from δ^13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau |
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| 引用本文： | 沈吉 汪勇 刘兴起 Ryo Matsumoto. A 16 ka climate record deduced from δ^13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau[J]. 中国海洋湖沼学报, 2006, 24(2): 103-110. DOI: 10.1007/BF02842807 |
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| 作者姓名： | 沈吉 汪勇 刘兴起 Ryo Matsumoto |
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| 作者单位： | Key Laboratory of Lake Sedimentation and Environment Nanjing Institute of Geography and Limnology C.A.S Nanjing 210008 China，Key Laboratory of Lake Sedimentation and Environment Nanjing Institute of Geography and Limnology C.A.S Nanjing 210008 China，Graduate School Chinese Academy of Sciences Beijing 100039 China，Key Laboratory of Lake Sedimentation and Environment Nanjing Institute of Geography and Limnology C.A.S Nanjing 210008 China，Department of Earth and Planetary Science University of Tokyo Tokyo 113-0033 Japan |
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| 基金项目： | Supported by National Key Basic Research Fund (No. 2004CB720205) and National Nature and Science Foundation of China (No. 40331003). |
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| 摘 要： | 1 INTRODUCTION δ13C in organic matters from lacustrine sedi- ments varies with several factors including aquatic plants, vegetation type in the catchment, atmos- pheric CO2 concentration, climate (temperature and precipitation), and properties of water, …
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| 关 键 词： | Quaternary climate record organic δ13C C/N ratio sediment Qinghai Lake |
| 收稿时间： | 2004-08-02 |
| 修稿时间： | 2006-01-16 |
A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau |
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| Shen Li,Wang Yong,Liu Xingqi,Ryo Matsumoto. A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau[J]. Chinese Journal of Oceanology and Limnology, 2006, 24(2): 103-110. DOI: 10.1007/BF02842807 |
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| Authors: | Shen Li Wang Yong Liu Xingqi Ryo Matsumoto |
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| Affiliation: | (1) Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography and Limnology, C.A.S., 210008 Nanjing, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China;(3) Department of Earth and Planetary Science, University of Tokyo, 113-0033 Tokyo, Japan |
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| Abstract: | On the basis of multi-proxy analysis on TOC, TN, C/N, organic δ13C and grain size, sediment record from Qinghai Lake provides evidences of stepwise-patterned climatic change since 16 ka BP. Results show that Qinghai Lake underwent six environmental stages. From 16.2 to 14.3 ka BP and from 4.0 to 2.1 ka BP, the organic δ13C value was controlled by the concentration of atmospheric CO2. Relative higher organic δ13C values occurred between 14.3 to 10.4 ka BP indicative of water hardness decrease resulted from melting ice water, corresponding to two intervals of C/N peak values to the Böling and Alleröd warm periods in Europe respectively. From 10.4 ka BP, Qinghai Lake entered the Holocene and the climate was warm and a little dry. The Megathermal appeared at about 6.7 ka BP when the vegetation around the lake transformed into a forest. Between 6.3 ka BP and 4.0 ka BP, the temperature decreased and δ13C value was controlled by the expansion of C3 plants and the retreat of C4 plants in river catchment. Since 4.0 ka BP, the climate gradually became cold and dry. From 2.1 ka BP, the cold-dry climate and human activity resulted in an abrupt increase in C/N with deceased δ13C value; meanwhile, many coarse grains appeared in sediments. |
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| Keywords: | Quaternary climate record organic δ 13C C/N ratio sediment Qinghai Lake |
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