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New evidence for enhanced cosmogenic isotope production rate in the atmosphere ∼37 ka BP

  • Wang Ninglian (a1), Yao Tandong (a1), Qin Dahe (a1), L. G. Thompson (a2), E. Mosley-Thompson (a2), J. Cole-Dai (a2), M. E. Davis (a2) and P.-N. Lin (a2)...

Abstract

A 36C1 peak has been found at about 37 ka BP in the Guliya ice core, drilled from the Qinghai-Tibetan Plateau. This peak is indicative of enhanced cosmogenic isotope production in the atmosphere, rather than a change in accumulation rate. Comparison with the records of 10Be and 36C1 in ice cores from Antarctica and Greenland indicates that peaks of the cosmogenic isotopes are global, and that they can be used as time markers for dating ice cores. Interestingly, the 37 ka BP global event coincided with a cold period.

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