Testing the annual nature of speleothem banding.
Testing the annual nature of speleothem banding.
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测试洞穴生物带的年度性质
DOI:
10.1038/srep02633
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发表时间:
2013
影响因子:
4.6
通讯作者:
Tan, Ming
中科院分区:
文献类型:
--
作者:
Shen, Chuan-Chou;Lin, Ke;Duan, Wuhui;Jiang, Xiuyang;Partin, Judson W.;Edwards, R. Lawrence;Cheng, Hai;Tan, Ming
Speleothem laminae have been postulated to form annually and this lamina-chronology is widely applied to high-resolution modern and past climate reconstructions. However, this argument has not been directly supported by high resolution dating methods. Here we present contemporary single-lamina230Th dating techniques with 2σ precision as good as ±0.5 yr on a laminated stalagmite with density couplets from Xianren Cave, China, that covers the last 300 years. We find that the layers do not always deposit annually. Annual bands can be under- or over-counted by several years during different multi-decadal intervals. The irregular formation of missing and false bands in this example indicates that the assumption of annual speleothem laminae in a climate reconstruction should be approached carefully without a robust absolute-dated chronology.
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影响因子:
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作者:
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通讯作者:
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