Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China.

Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China.
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中国东阁洞全新世晚期洞穴记录中太阳活动周期的证据

DOI:
10.1038/srep05159
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发表时间:
2014-06-04
期刊:
影响因子:
4.6
通讯作者:
Zhao K
Zhao K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Duan F;Wang Y;Shen CC;Wang Y;Cheng H;Wu CC;Hu HM;Kong X;Liu D;Zhao K

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太阳活动与亚洲季风(AM)之间的关系尚不清楚。本文根据中国西南部东葛洞近4200年来洞穴沉积物氧同位素的精确定年、高分辨率记录,对它们之间的可能联系进行了评价。在没有按时间顺序调整太阳信号的情况下,我们的记录显示出与宇宙成因核素14 C,太阳总辐照度(TSI)和太阳黑子数(SN)在数十年至百年时间尺度上的明显峰-峰相关性。我们的方解石δ 18 O和大气14 C之间的进一步交叉小波分析显示,在三个典型的周期约80,200和340年的统计学上很强的一致性,这表明在这些时间尺度上太阳活动在调制AM变化中的重要作用。结果进一步表明,方解石δ ~(18)O记录与大气~(14)C的相关性比与TSI的相关性好。这种更好的相关性可能意味着太阳-季风的联系最有可能是由宇宙射线和海洋环流(两者都与大气14 C有关)主导的,而不是直接的太阳加热(TSI)。
The association between solar activity and Asian monsoon (AM) remains unclear. Here we evaluate the possible connection between them based on a precisely-dated, high-resolution speleothem oxygen isotope record from Dongge Cave, southwest China during the past 4.2 thousand years (ka). Without being adjusted chronologically to the solar signal, our record shows a distinct peak-to-peak correlation with cosmogenic nuclide 14C, total solar irradiance (TSI), and sunspot number (SN) at multi-decadal to centennial timescales. Further cross-wavelet analyses between our calcite δ18O and atmospheric 14C show statistically strong coherence at three typical periodicities of ~80, 200 and 340 years, suggesting important roles of solar activities in modulating AM changes at those timescales. Our result has further indicated a better correlation between our calcite δ18O record and atmospheric 14C than between our record and TSI. This better correlation may imply that the Sun–monsoon connection is dominated most likely by cosmic rays and oceanic circulation (both associated to atmospheric 14C), instead of the direct solar heating (TSI).
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