摘要
据江苏宜兴茗岭洞穴ML石笋的Th230测年结果、年层计数以及与树轮14C残差曲线的对比,建立了该石笋记录的中全新世持续561年的氧同位素时间序列(5.13～5.69kaB.P.)。分辨率达3～4年的氧同位素曲线与相应时段树轮14C残差呈显著的正相关(r=0.54),揭示了中全新世东亚季风降水百年尺度上受太阳辐射驱动。从石笋δ18O功率谱中识别出类似树轮14C的28～25a、10a等周期成分,表明该地区十年尺度季风降水也受太阳活动的影响。
A 561-year (5.13 ~ 5.69ka B.P.) oxygen isotope time series in the Mid-Holocene is established on the basis of ^(230)Th, annual-layer counting and the Δ^(14)C of growth ring dating results of a stalagmite from Mingling cave at Yixing, Jiangsu province. The remarkable positive correlation (r=0.54) between the 3 ~ 4 year resolution oxygen isotope curve and the Δ^(14)C of growth ring curve during the same period reveals that East Asian Monsoon precipitation is positively related to solar activity at centennial time-scale during Mid-Holocene. Power spectrum analysis for δ^(18)O of the stalagmite proves that there were the periodicities of 28 ~ 25 year and 10 year respectively, which shows the East Asian Monsoon precipitation was also affected by decadal scale variations of solar activities.
出处
《中国岩溶》
CAS
CSCD
2004年第4期273-276,共4页
Carsologica Sinica
基金
国家杰出青年科学基金(40225007)资助项目
