| Variations of organic carbon isotopic composition and its environmental significance during the last glacial on western Chinese Loess Plateau |
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| 引用本文： | CHEN Fahu RAO Zhiguo ZHANG Jiawu JIN Ming MA Jianying. Variations of organic carbon isotopic composition and its environmental significance during the last glacial on western Chinese Loess Plateau[J]. 科学通报(英文版), 2006, 51(13): 1593-1602. DOI: 10.1007/s11434-006-2003-6 |
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| 作者姓名： | CHEN Fahu RAO Zhiguo ZHANG Jiawu JIN Ming MA Jianying |
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| 作者单位： | [1]Center for Arid Environment and Paleoclimate Research （CAEP）, Key Laboratory of Western China＇s Environmental System of Ministry of Education, Lanzhou University, Lanzhou 730000, China [2]Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China [3]Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
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| 摘 要： | The last glacial period is characterized by a cold and dry climate with low atmospheric CO2 concentration. The relatively arid climate and low CO2 concentration are favorable to the growth of C4 plants, but the low temperature limits the development of th…
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| 关 键 词： | 有机碳同位素 成品冰 黄土高原 华西地区 |
| 收稿时间： | 2006-02-16 |
| 修稿时间： | 2006-02-162006-04-28 |
Variations of organic carbon isotopic composition and its environmental significance during the last glacial on western Chinese Loess Plateau |
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| Fahu Chen,Zhiguo Rao,Zhang Jiawu,Jin Ming,Ma Jianying. Variations of organic carbon isotopic composition and its environmental significance during the last glacial on western Chinese Loess Plateau[J]. Chinese science bulletin, 2006, 51(13): 1593-1602. DOI: 10.1007/s11434-006-2003-6 |
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| Authors: | Fahu Chen Zhiguo Rao Zhang Jiawu Jin Ming Ma Jianying |
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| Affiliation: | (1) Center for Arid Environment and Paleoclimate Research (CAEP), Key Laboratory of Western China’s Environmental System of Ministry of Education, Lanzhou University, Lanzhou, 730000, China;(2) Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(3) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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| Abstract: | A high-resolution loess section in the western Chinese Loess Plateau, Yuanbao Section, was sampled for organic carbon isotopic analyses. The soil organic carbon isotope (δ 13Corg) varied between −22.6‰ and −27.5‰ during the last glacial at the section. During the last interstadial, the δ 13Corg values were more negative than those in both early and late periods of the last glacial by 4‰ The isotopic composition indicates a coupled response of the pure C3 plants to the temperature, precipitation and the concentration of atmospheric CO2. Decrease in temperature and the atmospheric CO2 concentration from the last interstadial to Last Glaicial Maximum (LGM) caused the organic carbon isotopes to become positive by 1.5‰–2.0‰ The amplitude of 4‰ in the δ 13Corg variation during the last glacial should be mainly caused by the precipitation change. Therefore, the δ 13Corg variations of the Yuanbao Section during the last glacial period documented the large-amplitude fluctuation of the monsoon precipitation, which is estimated to be 250–310 mm more during the last interstadial than that in the LGM, and 100 mm more than that during early last glacial. The rapid changes of the monsoon precipitation on millennial scale during the last glacial have also been recorded in the isotopic variations in Yuanbao loess section. As the isotopic composition varies complicatedly as shown in the loess-paleosol sequence, it cannot be simply attributed to the abundances of C3 and C4 plants or be used as an indicator of the summer monsoon variations. |
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| Keywords: | western Chinese Loess Plateau last glacial organic car- bon isotopes C3 plants. |
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