论文部分内容阅读
根据南京葫芦洞一支石笋高精度230Th年龄及纹层计数,确定该石笋在24~21kaBP期间发育连续3000年左右的年层序列.石笋年纹层厚度与光面灰度具有良好的相关性(r=0.55),支持纹层厚度反映夏季风降水效应的观点.年纹层厚度与反映太阳活动的冰芯10Be记录在百年-千年尺度上的一致性,说明全球冰量最大背景下东亚夏季风气候的高频变化仍受太阳活动驱动.年层序列的功率谱分析结果表明十年-百年尺度的季风气候变化与太阳活动周期基本一致.
According to the high accuracy of 230Th stratum and stratum count of a stalagmite in Nanjing Hulu Cave, the stratum ages of the stalagmite that developed for 3000 consecutive years in 24 ~ 21ka BP period were determined.The thickness of stalagmite was consistent with the gray level r = 0.55), supporting the view that the lamina thickness reflects the effect of summer monsoon rainfall.The consistency of annual lamina thickness and ice core 10Be reflecting the solar activity recorded on the centennial-millennium scale indicates that the East Asian summer monsoon climate Is still driven by the solar activity.Analysis of the power spectrum of the annual series shows that the monsoon climate change at the ten-hundred-year scale is basically consistent with the solar activity cycle.