东海内陆架沉积气候信息的端元分析模型反演

张晓东; 许淑梅; 翟世奎; 张怀静

东海内陆架沉积气候信息的端元分析模型反演

中国海洋大学海洋地球科学学院, 青岛 266003

基金项目:

国家重点基础研究发展规划"973"项目(2002CB412409)

详细信息

作者简介:
张晓东(1971-),男,博士生,从事海洋地质学研究,E-mail:zxd@ouc.edu.cn

中图分类号: P736.2
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出版历程
- 收稿日期: 2005-08-04
- 修回日期: 2006-02-27

THE INVERSION OF CLIMATE INFORMATION FROM THE SEDIMENT OF INNER SHELF OF EAST CHINA SEA USING END-MEMBER MODEL

College of Marine Geosciences, Ocean University of China, Qingdao 266003, China

摘要

摘要: 应用沉积物粒度端元分析模型对在东海内陆架泥质区取得的30号柱样的高分辨率粒度数据序列进行了反演,分离出3个端元,根据端元的频率分布特征和已有研究结果,认为3个端元可能为现代陆源细颗粒物质(EM1)、现代陆源粗颗粒物质(EM2)和风暴带来的残留沉积区再悬浮物质(EM3),并对本区域的水动力环境进行了分析,认为分离出的端元EM1和EM2的比值EM2/(EM1+EM2)序列可以反映东海沿岸流强度的历史变化,进而反映东亚冬季风强度和中国温度波动的历史。该序列与观测到的近百年来东亚冬季风强度记录、竺可桢的中国温度波动曲线以及葛全胜的中国东部冬半年温度变化序列有很好的对应关系。得出的气候指标序列在竺可桢给出的公元600-1100年高温期间的780-920年出现了一个极小值区,为许多作者推测的公元780-920年出现一个短暂的冷期提供了佐证;另外该序列近百年来变化幅度明显,反映了人类活动的影响。
- 粒度 /
- 端元分析模型 /
- 东亚冬季风 /
- 中国温度变化 /
- 东海内陆架
Abstract: End-member model is used in the inversion of high resolution grain size data sequences of No.30 sediment core sampled in the inner shelf of East China Sea. The result shows the data can be reproduced by three end-members(EM). Based on the grain size frequency curves and acquired knowledge, we come to a conclusion that EM1 represents fine modern hemipelagites, EM2 represents coarse modern hemipelagites, and EM3 represents sediment transport from the relict sediment district. Then we analyzed the hydrodynamic environment of the district and concluded that the EM2/(EM1+EM2) sequence represented the variation of coast-wide current of the East China Sea and the variation of East Asian winter monsoon and China temperature. Through comparison with about a hundred year record of East Asian winter monsoon index, China temperature variation curves inferred by ZHU Ke-zhen, and East China winter temperature variation curves inferred by GE Quan-sheng, we found this proxy corresponds very well with the sequences mentioned above. This climate proxy sequence shows a brief period of cold time during 780-920AD and a long period of warm time during 600-1100AD presumed by ZHU Ke-zhen, and the variation of this sequence during the last hundred years is obvious, showing the influences of human being activities.
- grain size /
- end-member model /
- winter monsoon of East Asia /
- China temperature variation /
- inner shelf of the East China Sea

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