Causes and timing of the 8200 yr BP event inferred from the comparison of the GRIP Be-10 and the tree ring Delta C-14 record
Causes and timing of the 8200 yr BP event inferred from the comparison of the GRIP Be-10 and the tree ring Delta C-14 record
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通过比较 GRIP Be-10 和年轮 Delta C-14 记录推断 8200 年 BP 事件的原因和时间
DOI：
10.1016/j.quascirev.2004.08.007
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发表时间：
2004
影响因子：
4
通讯作者：
M. Vonmoos
中科院分区：
文献类型：
--
作者：
R. Muscheler;J. Beer;M. Vonmoos
本文通过对格陵兰中部GRIP冰芯高分辨率~（10）Be记录与著名的树木年轮Δ ~（14）C记录的对比，分析了8200年BP冷事件。通过将树轮绝对年代学转换到冰芯时间尺度上，我们发现GRIP记录中最冷的阶段发生在8150 yr BP左右。此外，这种方法使我们能够解开生产和气候对10 Be和14 C的影响，对过去的太阳活动的重建，以及碳循环和10 Be运输的变化具有重要意义。我们表明，在原则上，它是可能的，以推断海洋环流的变化，通过比较10 Be和14 C记录。然而，8200年BP事件的持续时间太短，不能明确地将大气14 C浓度的显著变化归因于全球海洋环流的变化。根据10 Be与气候记录的比较，人们可以认为，8200年BP冷事件是由太阳活动向低水平变化引发的。然而，这一联系受到质疑，因为在这一时期，太阳活动中还有其他类似的甚至更强烈的变化，与气候变化没有明显的联系。
We analyse the 8200yr BP cold event by comparing the high-resolution10Be record from the GRIP ice core from Central Greenland with the well-known tree ring Δ14C record. By transferring the absolute dated tree ring chronology to the ice core time scale, we show that the coldest phase in the GRIP record occurred around 8150yr BP. Furthermore, this method allows us to disentangle production and climate effects on10Be and14C with important implications for the reconstruction of past solar activity, and changes in the carbon cycle and10Be transport. We show that, in principle, it is possible to infer changes in ocean circulation by comparing10Be and14C records. However, the duration of the 8200yr BP event is too short to assign unambiguously a significant change in atmospheric14C concentration to changes in the global ocean circulation. Based on the comparison of10Be with climate records, one could argue that the 8200yr BP cold event is triggered by a change towards lower solar activity. However, this link is questioned by the fact that around this period there are other similar and even stronger changes in solar activity that have no apparent connection to climate changes.