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葫芦洞石笋记录的19.9-17.1ka BP东亚夏季风增强事件 被引量:12

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摘要 南京葫芦洞石笋(No.H82)高分辨率δ^18 O序列已表明16.5~10.3ka BP时段东亚季风与极地气候在千年尺度事件上存在耦合关系.现根据7个高精度^230Th年龄和573个δ^18 O数据,将这一石笋的高分辨率δ^18 O时间序列延伸至22.1ka BP,从而提供了末次盛冰期10a分辨率的连续东亚季风气候记录.石笋δ^18 O记录表明H1事件内部的次级季风减弱事件与格陵兰寒冷事件在世纪尺度上具有同步性.该记录显示在19.9~17.1ka BP存在显著的东亚夏季风增强事件,其平均夏季风强度相当于BФlling暖期的1/2,夏季风最强时甚至接近于BФlling暖期.这一季风增强事件在北半球海洋和陆地记录中均有不同程度的体现,可能是热带太平洋Super-ENSO响应于岁差周期太阳辐射的结果.
出处 《中国科学(D辑)》 CSCD 北大核心 2009年第1期61-69,共9页 Science in China(Series D)
基金 国家自然科学青年科学基金项目(批准号:40501003)资助
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