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A Cyclogram Analysis of the Bratislava 14C Tree-Ring Record During the Last Century

Published online by Cambridge University Press:  18 July 2016

M R Attolini ,
Menotti Galli ,
Teresa Nanni  and
Pavel Povinec
M R Attolini
Affiliation:
Istituto TESRE–CNR, Via Castagnoli 1, Bologna, Italy
Menotti Galli
Affiliation:
Dipartimento di Fisica dell'Universita, Bologna, Italy
Teresa Nanni
Affiliation:
Istituto FISBAT–CNR, Via Castagnoli 1, Bologna, Italy
Pavel Povinec
Affiliation:
Comenius University, Bratislava, Czechoslovakia
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Abstract

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Radiocarbon variations in dated tree-ring samples represent an important tool for the study of the history of solar activity and sun-earth relationships. From this point of view, an investigation of the 11-year radiocarbon cycle is very important. Our cyclogram analysis of the Δ 14C record in tree-ring samples during the last century has confirmed previous results obtained by conventional harmonic analysis, eg, the average amplitude of 2, the phase shift of 3–5 yr for different 11-yr solar cycles, and the anticorrelation dependence of Δ 14C on Wolf sunspot numbers. The observed shorter periodicity (ca 9 yr for Δ 14C compared to 10.5 yr for sunspots), may be due to extra factors in sun-earth relationships.

Type
III. Global 14C Variations
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 839 - 845
Copyright
Copyright © The American Journal of Science 

References

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