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Searching Solar Periodicities in the Late Glacial Record of Atmospheric Radiocarbon

Published online by Cambridge University Press:  18 July 2016

Tomasz Goslar ,
Nadine Tisnérat-Laborde  and
Martine Paterne
Tomasz Goslar
Affiliation:
Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan. Present address: Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Pozań, Poland. Email: goslar@radiocarbon.pl.
Nadine Tisnérat-Laborde
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, CNRS-CEA, 91198 Gif sur Yvette, France
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Abstract

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Accelerator mass spectrometry radiocarbon (AMS 14C) dating of the late glacial section of laminated sediments from Lake Gościąż and Lake Perespilno, Poland, performed with time resolution of 20–30 years suggests quasi-periodic oscillations of δ14C. The regularity of oscillations has been checked by the Maximum Entropy and Fast Fourier Transform methods (MEM and FFT), which revealed peaks at 200 and 230 yr. These periods are similar to those found in the high-precision Holocene δ14C record, and attributed to the changing sun. The analytical assessment of the significance of the FFT and MEM peaks is problematic because of non-uniform spacing and various uncertainties in the input data. The significance of the peaks has therefore been studied by the Monte-Carlo method. Because the original data were approximated with a spline function, the amplitude of the MEM and FFT peaks depends on the stiffness of the spline, which is strongly related to the “real” uncertainty of 14C ages. The Monte-Carlo experiments demonstrate that the significance levels of the MEM and FFT peaks also depend on the spline stiffness. Therefore, the existence of solar 14C variations in the Late Glacial remains an open question.

Type
II. Getting More from the Data
Information
Radiocarbon , Volume 43 , Issue 2A: Proceedings of the 17th International Radiocarbon Conference (Part 1 of 3) , 2001 , pp. 339 - 344
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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