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  

中国东海北部泥质区敏感粒度组分对东亚季风演变的响应(英文)

作　　者：孙晓燕[1] 李希彬[2,3] 岳晓峰 门翔[1] 

机构地区：[1]国家海洋信息中心,天津300171 [2]国家海洋局天津海洋环境监测中心站,天津300451 [3]天津市海洋环境监测预报中心,天津300451

出　　处：《Marine Science Bulletin》2011年第2期1-12,共12页海洋通报（英文版）

摘　　要：AMS14C dating and grain-size analysis for Core FJ04, located at mud area in the North of East China Sea provide us a high-resolution grain-size distribution curve varying with depth and time. This paper got environmental sensitive grain-size group by using standard deviation method, and proved that the selected sensitive grain-size group is an important proxy which can be used to reconstruct intensity of East Asian Winter Monsoon （EAWM）. Then we got reconstruction of EAWM evolvement since 3 ka B.P., which revealed two main phases： （1） 3 - 1.15ka B.P., relative weak EAWM with middle frequency fluctuation; （2） 1.15 - 0ka B.P., really strong EAWM with high frequency fluctuation. And 1.15 ka B.P. is a distinct turning point. During the whole period, 11 intense events of EAWM were recorded and correlated well with other climate records, but the response extent was different, which showed consistency of climate change and particularity of region response.本文运用粒级-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3ka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:①3-1.15kaB.P.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;②1.15kaB.P.为东亚冬季风强盛、高频率波动阶段。1.15kaB.P.是一个明显的转折点。此外,3ka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。

关 键 词：shelf of East China Sea mud area sensitive grain size group East AsianWinter Monsoon 

分 类 号：P732[天文地球—海洋科学]