| 近8kaBP来云南洱海地区气候演化的有机碳稳定同位素记录 |
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| 引用本文： | 张振克,吴瑞金.近8kaBP来云南洱海地区气候演化的有机碳稳定同位素记录[J].海洋地质与第四纪地质,1998,18(3):23-29. |
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| 作者姓名： | 张振克 吴瑞金 |
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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实验室 |
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| 基金项目： | 国家自然科学基金,中科院湖沼专项资助 |
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| 摘 要： | 根据洱海湖泊沉积有机碳稳定同位素记录，结合硅藻分析资料，恢复了近８ｋａ来云南洱海地区的气候演化序列。结果表明：８．１ｋａＢ．Ｐ．来的气候演化分为９个阶段，伴随湖泊水位波动变化。
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| 关 键 词： | 有机碳 稳定同位素 气候演化 洱海 云南 古气候 |
CLIMATE EVOLUTION RECORDED BY ORGANIC CARBON STABLE ISOTOPE RATIOS IN ERHAI LAKE IN THE PAST 8ka YEARS |
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| Zhang,Zhenke,Wu,Ruijin,Wang,Sumin,Xia,Weilan,Wu,Yanhong.CLIMATE EVOLUTION RECORDED BY ORGANIC CARBON STABLE ISOTOPE RATIOS IN ERHAI LAKE IN THE PAST 8ka YEARS[J].Marine Geology & Quaternary Geology,1998,18(3):23-29. |
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| Authors: | Zhang Zhenke Wu Ruijin Wang Sumin Xia Weilan Wu Yanhong |
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| Abstract: | Based on the data of organic carbon stable isotope ratios and diatoms,the sequences of climate evolution in the past 8ka years in Erhai Lake (in Yunnan Province)have been reconstructed.The results of the research indicate that the climate evolution in the past 8ka years can be devided into nine stages coinciding with lake level fluctuations.Comparisons of different regional environmental records indicate that the climate evolution was mainly controlled by the intensity and the temporal spatial changes of monsoon in southwest China.Before 5 9kaB.P.,the climate was inclined to warm temperate condition due to intensifications of solar radiation and monsoonal circulations in Northern Hemisphere.Organic carbon stable isotope ratios of lake sediment in Erhai Lake show that in warm or temperate dry stages southwest monsoon was weak and East Asian summer monsoon was intensified.On the contrary,in the conditions of temperate(warm) wet stages southwest monsoon was strong and summer monsoon was weak.There were three cold events in the records from Erhai Lake sediments,in 7 2kaB.P.,5 3kaB.P.and 3 7kaB.P. respectively.The cold dry or wet stages were affected by the intensification of Asian winter monsoon. |
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| Keywords: | organic carbon stable isotope ratios lake sediments climate evolution Asian monsoon Erhai Lake |
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