末次盛冰期南京石笋气候年序的研究

Here we provided more than 3000 oxygen and carbon isotope data with 59 precise TIMS-U series dating ages from five stalagmites collected from Hulu Cave at Tangshan near Nanjing for reconstructing a history of the East Asian monsoon over a period from 11 to 75kaBP. Our reconstructed high-resolution monsoon record shows sub-orbital time scale oscillations that correlated well to the established climatic events in global scale. By comparing our record with the Greenland ice core δ18O time series, we detected age offsets at the analogous rapid changes between the two records, which is possibly due to the relatively large age uncertain of the ice-flow model for the Greenland ice cores. Our precise dated ages for the rapid climatic changes have been verified by an Austria speleothem record and 39Ar/40Ar dating results of the Ash layer in the deep sea sediments of the northern Atlantic. Thus our time scale for rapid changes provides age constrains for studies of phase relation between different regional climatic records. Furthermore, our high-resolutionδ18O record, constrained by the annual band counting, indicates a quite different cooling process responding to the Heinrich Event 1 at the high northern latitude, which in turn suggests different climatic responses to the global past climatic changes.

据南京洞穴石笋年层计数和高精度测年结果，建立末次盛冰期６Ｋａ的石笋时间标尺。通过洞穴现代岩溶过程研究冰期石笋年层厚度变化曲线、稳定同位素、矿物学和结晶学以及微量元素地球化学等综合指标，恢复这一典型时段南京降水变化过程，提取中国东部夏季风活动区短尺度气候变化的特征周期和重大气候事件及与全球变化的响应过程与驱动机制。