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东亚季风MIS3早期DO事件的亚旋回及全球意义

, PP. 169-176

Keywords: MIS3阶段,石笋,DO事件,亚旋回

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Abstract:

根据湖北永兴洞石笋(YX51)10个U/Th年龄,470组氧、碳同位素数据建立了深海氧同位素3阶段(MIS3)早期57.735.6kaB.P.期间东亚夏季风演化时间序列。在发育时段,千年尺度δ18O峰谷变化与高纬冰芯记录的Dansgaard-Oeschger(DO)事件一致;δ13C呈现出与δ18O正相关同步演化特征,但受区域环境影响,在事件内部细节上存在差异。区域对比表明,同一季风区的永兴洞和葫芦洞石笋δ18O指示的季风降水同位素组成具有本质上一致性;高低纬记录对比显示,千年尺度的峰谷变化一一对应,反映热带辐合带(ITCZ)水汽传输能力、平均位置变化对东亚季风和高北纬气候具有重要影响。在DO13至DO15事件内部,永兴洞石笋δ18O记录了显著的双峰特征,说明低纬季风强度变化和格陵兰冰芯δ18O揭示的次级暖峰具有一致对应关系,指示大气快速传输机制在高低纬环境突变中起着重要作用。

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