研究论文 |
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Climate Change Indicated by Trace Elements in Salawusu River Basin |
LI Ming-qi1, JIN He-ling1,2, DONG Guang-rong1, ZHANG Hong1, SUN Zhong1 |
1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.School of Resources and Environment, Lanzhou University, Lanzhou 730000, China |
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Abstract Salawusu river basin is in the southeast of the Mu Us Desert, and lies between desert and the Loess plateau and is sensitive to climate changes.Firstly, there are analyses of Hierarchical cluster and correlation of 16 trace elements(P、V、Cr、Mn、Co、Ni、Cu、Zn、Pb、As、Rb、Y、Zr、Sr、Ba and Nb) and Rb/Sr and Sr/Ba in Dishaogouwan section. As a result, climate change that Sr、Ba、Rb/Sr and Sr/Ba explain is not well. So the papers analyzes the climate changes according to the content of trace elements(P、V、Cr、Mn、Co、Ni、Cu、Zn、Pb、As、Rb、Y、Zr and Nb) .According to the content and variation of trace elements, the climate change can be divided into 5 stages:(223~196)ka BP,warm and humid,and in the pace with palaeosol S2;(196~148)ka BP,cold and arid, and in the pace with Loess L2 and belonging to Last Second Glacial;(148~75)ka BP,warm and humid ,and in the pace with Last Interglacial;(75~10)ka BP,cold and arid, and corresponding of Last Glacial and 10 ka BP to present,warm and humid,but the climate is ariding. The papers also makes contrast between the variation of trace elements of different time and oxygen isotope phases of deep sea and mainland ice cores. The result shows that the climate change in the Salawusu River area is consistent with the global change.
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Received: 14 June 2005
Published: 20 March 2006
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