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选择处于典型季风区中国内部湖北神农架地区青天洞一支具有连续清晰年纹层发育的石笋样品(QT6),通过精确的年纹层计数,结合高精度230Th年龄,建立2592～1225aB.P.期间长达1367a的石笋δ18O时间序列。石笋δ18O记录的17个持续时间在80a左右的峰谷旋回,与格陵兰冰芯δ18O记录具有非常好的一一对应关系,说明在年代际尺度上石笋δ18O同样能反映区域性气候变化,可能的机制是北高纬温度的变化通过大气传输影响热带辐合带(ITCZ)的迁移,从而影响东亚季风的强弱变化。
A stalagmite sample (QT6) with consecutive clear annual lamina development in Qingtian-dong, Hubei Province, China, was selected for the typical monsoon region. Periods of 2592-1225aB.P were established by accurate annual pattern counting combined with high-precision 230Th age Stalagmite δ18O time series up to 1367a. The 17 durations recorded by stalagmiteδ18O are about 80◦ around the peak valleys, which are in good correspondence with the δ18O records of the Greenland ice core. It shows that the stalagmite δ18O on the interdecadal scale also reflects the possible mechanism of regional climate change. Changes in temperature at the northern high latitudes affect the migration of the tropical convergence zone (ITCZ) through atmospheric transport, thus affecting the intensity of the East Asian monsoon.