Il Nuovo Cimento C

, Volume 19, Issue 4, pp 527–536

Solar variability and ring widths in fossil trees

Authors

  • S. Cecchini
    • Istituto TESRE-CNR
  • M. Galli
    • Dipartimento di FisicaUniversità di Bologna
  • T. Nanni
    • Istituto FISBAT-CNR
  • L. Ruggiero
    • Dipartimento di Scienza dei MaterialiUniversità di Lecce
Article

DOI: 10.1007/BF02523768

Cite this article as:
Cecchini, S., Galli, M., Nanni, T. et al. Il Nuovo Cimento C (1996) 19: 527. doi:10.1007/BF02523768

Summary

We have analysed ring width sequences of 1.3 My old fossil trees, grown with no water deficit, in Dunarobba forest (Italy). We find evidence for a modulation period of the annual ring growth widths on time scale of 11 y to 15 y. Since similar modulation cycles have also been found by other authors in polar ice10Be concentration of the last millennium and in a series of annual ring widths of a same kind of trees grown in Central Europe of 15–20 My ago, we suggest that such cycles might be related to solar-activity cycles. This would support the hypothesis of a quasi-periodic behaviour of the solar dynamical system controlled by an oscillator whose fundamental period is of 22–25y, that can be identified with the Hale cycle; this system would be operational at least since the Miocene era.

PACS 92.60.Ry

Climatology

PACS 96.60

Solar physics

Copyright information

© Società Italiana di Fisica 1996