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首页> 外文期刊>Chinese science bulletin >Imprint of solar activity on Nanjing stalagmite annual layer thickness sequence during the Last Glacial Maximum
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Imprint of solar activity on Nanjing stalagmite annual layer thickness sequence during the Last Glacial Maximum

机译：最后一次冰期最高峰期间太阳活动对南京石笋年层厚度序列的影响

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摘要

A 3000-year-long stalagmite chronology from Hulu Cave near Nanjing was established by counting annual layers under microscope. Based on the ~(230)Th age, this chronology covers the period 24- 21 kaBP, within the Last Glacial Maximum (LGM). Two proxies, annual layer thickness and gray level were measured along the growth axis of the stalagmite profile in order to establish a high-resolution East Asian monsoon history during the LGM. The high correlation coefficient (r= 0.55) between the two proxies suggests that both of them were controlled by a common factor, possibly reflecting changes in the strength of summer monsoon circulation and its precipitation. Low frequency variations of the annual layer thickness, ranging from centennial to millennial scales, are approximately in agreement with the ~(10)Be-flux recorded in the Greenland ice core, indicating that changes in East Asian monsoon strength might be forced by solar outputs during the LGM periods. In support of this, Fourier power spectrum analysis of the annual layer thickness showed certain decadal to centennial-scale cycles that agree well with the periodicities of solar activity.
机译：通过在显微镜下对年层数进行计数，建立了南京附近葫芦洞3000年的石笋年表。基于〜（230）Th年龄，此年代顺序涵盖了最后冰川最大值（LGM）内的24-21 kaBP。沿石笋剖面的生长轴测量了两个代理，即年层厚度和灰度，以便在LGM期间建立高分辨率的东亚季风历史。两个代理之间的高相关系数（r = 0.55）表明它们都是受一个共同因素控制的，可能反映了夏季风环流强度及其降水的变化。年层厚度的低频变化范围从百年到千年级，大约与格陵兰冰芯中记录的〜（10）Be-通量相符，表明东亚季风强度的变化可能是由太阳能输出引起的在LGM期间。为此，对年厚度的傅立叶功率谱分析表明，某些年代际到百年尺度的周期与太阳活动的周期非常吻合。

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