东海北部泥质区敏感粒度组分对东亚季风演变的响应  

RESPONSE OF ENVIRONMENTAL SENSITIVE GRAIN SIZE GROUP IN CORE FJ04 FROM MUD AREA IN THE NORTH OF EAST CHINA SEA TO EAST ASIAN WINTER MONSOON EVOLVEMENT

作　　者：孙晓燕[1,2] 李广雪[1,2] 刘勇[1,2] 马妍妍[1,2] 李俊杰[1,2] 

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]海底科学与探测技术教育部重点实验室,青岛266100

出　　处：《海洋地质与第四纪地质》2008年第4期11-17,共7页Marine Geology & Quaternary Geology

基　　金：国家重点基础发展研究规划项目(2005CB422304)

摘　　要：运用粒级一标准偏差方法对FJ04孔146cm以上部分进行敏感粒度组分分析与提取，证明选取的敏感粒度组分是本区重要的环境替代性指标，其平均粒径的变化可以用来指示东亚季风的强弱。获得了东海北部泥质区3kaBP以来东亚冬季风强度的演化过程，结果表明东亚季风经历了两个主要的演变阶段：①3～1．15kaBP为东亚冬季风较弱，中等程度波动阶段，期间也存在几次冬季风加强期；②1．15kaBP到现代为东亚冬季风强盛、高频率波动阶段。1．15kaBP是一个明显的转折点，此外，3kaBP来敏感粒度组分平均粒级的变化还记录了11次冬季风增强事件，与全球其他地区的气候记录具有极好的对应关系，但在不同的地区的响应程度不同，说明气候变化存在全球一致性和区域响应的特殊性。The authors get environmental sensitive grain size group in core FJ04 by using grain size-standard deviation method, which proves the selected sensitive grain size group is an important proxy. The mean grain size of this sensitive group can be used to reconstruct the Asian winter monsoon intensity. The reconstruction of the East Asian winter monsoon evolvement since 3 kaBP reveals two main phases.-（1）3-1.15 kaBP,with relative weak intensity and medium frequency fluctuation （2）1.15-0 kaBP,with really strong and high frequency fluctuation. 1.15 kaBP is a distinct point. During the whole period. 11 obvious winter monsoon buildup events were recorded and correlated well with other climate records, but showed different extent response, which proves the consistency of climate change.

关 键 词：泥质区 敏感粒度组分 东亚冬季风 东海陆架 

分 类 号：P736.21[天文地球—海洋地质]