| 青藏高原北部可可西里地区近4000年来尘暴事件初探——来自库赛湖沉积物粒度的证据 |
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| 引用本文： | 王永波,刘兴起,张恩楼,羊向东,姚波.青藏高原北部可可西里地区近4000年来尘暴事件初探——来自库赛湖沉积物粒度的证据[J].沉积学报,2009,27(4):691-696. |
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| 作者姓名： | 王永波 刘兴起 张恩楼 羊向东 姚波 |
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| 作者单位： | 中国科学院南京地理与湖泊研究所 湖泊与环境国家重点实验室 南京 210008 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 通过分析库赛湖近4000年来湖相沉积物粒度组成特征，对比人工俘获风成物粒度特征，表明库赛湖沉积物中粗颗粒组分（>64 μm）主要由风力搬运作用进入湖泊沉积，记录了该地区尘暴事件历史。重建的尘暴事件序列表明:2 500～800 cal aBP时段为该地区近4 000年来尘暴事件高频发生的阶段，4 000～2 500 cal aBP和800 cal aBP以来的时段尘暴事件发生频率较低；近千年来的尘暴事件主要发生于小冰期内的3次降温时段。与贵州董歌洞石笋氧同位素对比分析表明，库赛湖地区近4 000年来气候变化受亚洲季风的影响，尘暴事件多发生于夏季风较弱的气候干冷时段。
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| 关 键 词： | 库赛湖 粒度特征 尘暴事件 亚洲季风 青藏高原北部 |
| 收稿时间： | 1900-01-01 |
Dust-storm Events in Kekexili Area, Northern Tibetan Plateau During the Past 4000 Years: Evidence from Grain-size Analysis of Lacustrine Sediments in Kusai Lake |
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| WANG Yong-bo,LIU Xing-qi,ZHANG En-lou,YANG Xiang-dong,YAO Bo.Dust-storm Events in Kekexili Area, Northern Tibetan Plateau During the Past 4000 Years: Evidence from Grain-size Analysis of Lacustrine Sediments in Kusai Lake[J].Acta Sedimentologica Sinica,2009,27(4):691-696. |
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| Authors: | WANG Yong-bo LIU Xing-qi ZHANG En-lou YANG Xiang-dong YAO Bo |
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| Institution: | State Key Laboratory of Lake and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008 |
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| Abstract: | Based on the analyses of grain size characteristics for lacustrine sediments in Kusai lake, compared with grain size characteristics of trapped aeolian dust, the results indicate that the coarse grain component(>64 μm) are carried by wind action, recording the dust storm history of this area. The reconstructed dust storm sequence show: 2 500～800 cal aBP was the period with the highest frequency for dust storm events, while during 4 000～2 500 cal aBP and 800～0 cal aBP the frequency were lower correspondingly; and the dust storm events in the past 1 000 years were concentrated in the three cooling events stages of LIA. Comparative analysis with oxygen isotope records from Dongge Cave reveals that the climatic evolution of Kusai Lake area can be effected by the Asian Monsoon during the past 4 000 years, and the dust storm events occurred frequently during the cold dry climate due to the decreased Summer Asian Monsoon. |
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