Environmental changes reflected by n-alkanes of lake core in Nam Co on the Tibetan Plateau since 8.4 kaB.P. |
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Authors: | Xiao Lin LiPing Zhu Yong Wang JunBo Wang ManPing Xie JianTing Ju Roland Mäusbacher Antje Schwalb |
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Institution: | [1]Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China; [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China; [3]Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; [4]Institut for Geographie, Friedrich-Schiller-Universitat, D-07743 Jena, Germany; [5]Institut für Umweltgeologie, Technische Universitat, 38106 Braunschweig, Germany |
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Abstract: | The n-alkanes are extracted from NMLC-1 core that was drilled in the Nam Co, central Tibet. They are measured by using Gas Chromatography
and Mass Spectrometry (GC/MS) for componential and quantitative analyses. According to the constructed depth-age model, the
component and concentration of n-alkanes, together with total organic carbon (TOC), total nitrogen (TN) and carbonate are used to elucidate palaeoenvironmental
changes of Nam Co during the past 8.4 ka. The results indicate that Holocene environment performs three stages in the lake
area. In the stage of 8.4–6.7 kaB.P., it was warmer while precipitation slightly increased. This stage was ended by an obvious
cold/dry event. During 6.7–5.8 kaB.P., temperature increased rapidly and reached its maximum values at about 6.0 kaB.P. The
environments were warm/wet optimum for the blooming of terrestrial plants and submerged aquatic plants. After that, temperature
decreased continuously and showed the lowest values at about 3.0 kaB.P. From 2.9 kaB.P. to the present, temperature rose again
but alternated with cold and warm. The lake area tended to be dry after 1.4 kaB.P. During 600–400 aB.P., the environmental
feature was the reflection of “Little Ice Age”.
Supported by the National Basic Research Program of China (Grant No. 2005CB422002), the National Natural Science Foundation
of China (Grant Nos. 40571172 and 40331006), and EU Sixth Framework Projects (BRAHMATWINN, Grant No. FP6-036952) |
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Keywords: | lake sediments n-alkanes environmental changes Nam Co Tibetan Plateau |
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