δ~(18)O record of a 700-years-old speleothem from the Shuiyuan Cave in eastern Nanling Mountain and its paleoclimatic implications
YANG Liang;CHEN Lin;HUANG Jia-yi;CHEN Qiong;LIN Ke;LIU Shu-hua;MI Xiao-jian;SHEN Chuan-chou;ZHOU Hou-yun;School of Geography, South China Normal University;Department of Geosciences, National Taiwan University;
The focus of most paleoclimate reconstructions has been put on speleothem δ18O variability while the paleoclimatic and paleoenvironmental implications of δ18O have many controversies. The contrast between the recent stalagmite δ18O record and the climate change message recorded in the historical document can help to solve this problem. The history of high-resolution summer monsoon variations during the past 700 years was reconstructed by means of precise 230 Th dating and the high-resolution oxygen isotopic(δ18O) analysis of SYD-6 stalagmite from the Shuiyuan Cave in eastern Nanling Mountain, China. It is found that the variation trend of δ18O records is consistent with the change frequencies of drought and flood disasters in the southern areas of China as recorded by the historical document since the Little Ice Age, indicating the δ18O record of SYD-6 stalagmite may be closely related to the intensity of summer monsoon and monsoon precipitation. According to the record, we analyzed the summer monsoon variation in eastern Nanling during the past 700 years.