| 青海湖沉积物有机碳及其同位素的气候环境信息 |
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| 引用本文： | 张恩楼,沈吉,夏威岚,朱育新,王苏民.青海湖沉积物有机碳及其同位素的气候环境信息[J].海洋地质与第四纪地质,2002,22(2):105-108. |
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| 作者姓名： | 张恩楼 沈吉 夏威岚 朱育新 王苏民 |
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| 作者单位： | 中国科学院,南京地理与湖泊研究所湖泊沉积与环境开放研究实验室,南京,210008 |
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| 基金项目： | 国家自然科学基金资助项目 (4 0 0 72 0 5 6)，中国科学院创新工程项目 (KZCX1-10 -0 1) |
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| 摘 要： | 通过对青海湖沉积物有机碳及其同位素的分析，结合碳酸盐含量的变化特征，探讨了青海湖沉积物有机碳及其同位素组成的环境意义，并且据此分析了青海湖地区近700a来的气候环境演变。青海湖沉积物的有机碳含量及其同位素较好地记录了温度的变化，在有机碳含量高，有机碳同位素低时，气温较高，反之则相反，小冰期的3次冷期以及20世纪以来的升温在该岩心中得以清晰地反映。
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| 关 键 词： | 有机碳 有机碳同位素 环境演变 青海湖 沉积物 碳酸盐含量 温度 |
| 文章编号： | 0256-1492(2002)02-0105-04 |
| 修稿时间： | 2001年7月9日 |
ENVIRONMENTAL RECORDS FROM ORGANIC CARBON AND ITS ISOTOPE OF QINGHAI LAKE SEDIMENT |
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| ZHANG En lou,SHEN Ji,XIA Wei lan,ZHU Yu xin,WANG Su min.ENVIRONMENTAL RECORDS FROM ORGANIC CARBON AND ITS ISOTOPE OF QINGHAI LAKE SEDIMENT[J].Marine Geology & Quaternary Geology,2002,22(2):105-108. |
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| Authors: | ZHANG En lou SHEN Ji XIA Wei lan ZHU Yu xin WANG Su min |
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| Abstract: | Qinghai Lake is the biggest brackish lake of China. It lies in the northeast of the Tibet Plateau. That the location of the lake is influenced by the east monsoon, Siberian Mongolian monsoon and the Westerlies enables its deposits to record the climatic and environmental change sensitively. Based on the analyses on the organic carbon content and organic carbon isotope of Qinghai Lake sediments,and compared with the character of carbonate content, this paper mainly deals with the environmental significance of the organic carbon content and its isotope. Through these analyses, the climatic and environmental changes of this area during the past 700 years were reconstructed. The result shows that the organic carbon content and its isotope of Qinghai Lake well correlate with temperature changes. During the colder episodes in this area, the organic carbon content was lower, but its isotope value was higher,and vice versa. That the organic carbon content was low and its isotope was high at 1865AD,1665AD and 1565AD reflects the cold condition of these three ages, which coincides with the cold ages of Little Ice Age reconstructed by glacier and tree rings. During the last several decades, the organic carbon content decreased continually, and its isotope increased accordingly, well indicating the temperature increases since the beginning of 20th century. The organic carbon and its isotope record the environmental variations of Qinghai Lake sensitively. Three colder episodes of the Little Ice Age and rising temperature from the beginning of 20th century were clearly reflected by the Qinghai Lake sediments. |
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| Keywords: | organic carbon organic carbon isotope environment change Qinghai Lake |
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