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
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
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发表时间：
2011
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通讯作者：
L. Xi-bin
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作者：
L. Xi-bin
东海北部泥质区FJ 04孔的AMS 14 C测年和粒度分析，提供了高分辨率的粒度随深度和时间的变化曲线。本文利用标准差法得到了环境敏感粒度组，并证明了所选取的敏感粒度组是重建东亚冬季风强度的重要代用指标。重建了3 ka B. P.以来的EAWM演化，揭示了两个主要阶段：（1）3 - 1.15kaB. P.，（2）1.15 - 0kaB. P.，非常强的EAWM，具有高频率波动。1.15 ka B. P.是一个明显的转折点。整个时段共记录到11次东亚冬季风强事件，与其它气候记录相关性较好，但响应程度不同，体现了气候变化的一致性和区域响应的特殊性。
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.