Another rapid event in the carbon-14 content of tree rings
Another rapid event in the carbon-14 content of tree rings
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DOI：
10.1038/ncomms2783
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发表时间：
2013-04-01
影响因子：
16.6
通讯作者：
Nakamura, Toshio
中科院分区：
文献类型：
--
作者：
Miyake, Fusa;Masuda, Kimiaki;Nakamura, Toshio
以前，我们已经观察到，在树木年轮中测量的大气C-14含量显示出从公元774年到775年的强劲增长。虽然这一事件的原因可以用一个大的太阳质子事件或一个短的伽马射线爆发来解释，但对原因的更详细的讨论是困难的，因为这种快速的C-14事件的发生率仍然是未知的。在这里，我们报告了从公元822年到1020年的新的C-14测量结果，以及从公元992年到993年C-14含量第二次快速增加的发现。南极冰芯中Be-10通量的峰值对应于这两个C-14事件。两次事件的通量增加比例（C-14/Be-10）是一致的。因此，这些事件极有可能具有相同的起源。考虑到C-14增加事件的发生率，太阳活动是C-14增加事件的一个合理原因。
Previously, we have observed that the atmospheric C-14 content measured in tree rings showed a strong increase from AD 774 to 775. Although the cause of this event can be explained by a large solar proton event or a short gamma-ray burst, a more detailed discussion of the cause is difficult because the rate of occurrence of such rapid C-14 events remains unknown. Here we report new C-14 measurements from AD 822 to 1020, and the discovery of a second rapid increase of C-14 content from AD 992 to 993. The Be-10 flux in the Antarctic ice core shows peaks corresponding to these two C-14 events. The proportions of flux increase (C-14/Be-10) of the two events are consistent with each other. Therefore, it is highly possible that these events have the same origin. Considering the occurrence rate of C-14 increase events, solar activity is a plausible cause of the C-14 increase events.