| 摘要: |
| 根据高分辨率湖泊沉积的有机碳稳定同位素记录、硅藻等环境指标分析结果，将洱海全新世大暖期（9.1–3.0ka B.P.）的环境演化分为7个阶段，环境变化序列以温（暖）湿－暖（温）干为主，其中存在明显冷干（湿）事件，冷事件出现在7.2ka B.P.、5.3ka B.P.和3.7ka B.P.。全新世大暖期洱海湖面波动与气候变化具有明显的一致性。洱海湖泊沉积记录的环境演化主要受亚洲季风强弱转换和时空迁移的影响，冷事件与亚洲冬季风加强有关，暖干气候受东亚夏季风加强影响，温（暖）湿气候反映西南季风加强。 |
| 关键词: 湖泊沉积 洱海 环境演变 西南季风 东亚季风 全新世大暖期 |
| DOI：10.11693/hyhz200002014014 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49672132号;中国科学院创新工程项目，KZCX1－Y－05号 |
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| ENVIRONMENTAL EVOLUTION RECORDED BY LAKE SEDIMENTS FROM ERHAI LAKE, YUNNAN PROVINCE IN HOLOCENE MEGATHERMAL |
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ZHANG Zhen-ke1, WU Rui-jin2, WANG Su-min2, SHEN Ji2, WU Yan-hong2, LI Sheng-feng1
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1.Department of Geography and Oceanography, Nanjing University, Naming, 210093;2.Nanjing Institute of Geography and Limnology , The Chinese Academy of Sciences, Nanjing, 210008
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| Abstract: |
| Based upon the high resolution environmental proxy data including radiocarbon ages, organic carbon stable isotope ratios and diatom concentrations from Erhai Lake sediment cores, the environmental evolution in Holocene Megathermal (ca. 8.1–3.0ka B.P.) is divided into seven stages with main sequences of temperate or warm-wet and warm (temperate)-dry. The events of cold wet (3.7ka B.P.) and cold dry (7.2ka B.P. and 5.3ka B.P.) are recorded by the sediments from Erhai Lake in Holocene Megathermal. During the period the lake level fluctuations were coincided with climate variations. The environmental evolution recorded by lake sediments was mainly affected by the strong-weak transition and temporal-spatial changes of the monsoon in Asia. Stages of warm (temperate)-dry in Holocene Megathermal were controlled by the west-moving of subtropical high pressure in the Northwest Pacific Ocean, which indicates that southeast monsoon was intensified in summer. Stages of temperate (warm)-wet show the intensification of southwest monsoon. The cold events were the results of the enhancement of winter monsoon in East Asia. |
| Key words: Lake sediment, Erhai lake, Environmental changes, Southwest monsoon, East Asian monsoon, Holocene Megathermal |
