The summer monsoon evolution recorded by carbon isotope of organic matter from the Yuanbao loess section during the Last Interglaciation |
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Authors: | Yong He Dahe Qin Jiawen Ren Fengxia Li |
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Institution: | (1) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 730000 Lanzhou, China |
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Abstract: | Based on the carbon isotope record of organic matter from the Yuanbao loess section, northwestern China, five enhanced summer
monsoon events were observed at this area during the Last Interglaciation. Such events were also recorded by the paleosol
layers, pollen assemblage and magnetic susceptibility. It is suggested that the enhanced summer monsoon leads to the shift
of vegetation type, which results in the change of δ13C value of organic matter in the paleosol layer. It appears that the δ13C of organic matter is a good indicator for the summer monsoon variation. Among these five events, the first, second and the
fifth reached their maximum smoothly, but the other two had experienced a less cold stage before reaching their peaks, which
suggests that the mechanisms of such events may be different. |
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Keywords: | Chinese Loess Plateau paleosol carbon isotope of organic matter summer monsoon |
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