Solar maximum epoch imprints in tree-ring width from Passo Fundo, Brazil (1741–2004)

A tree-ring thickness time series from Passo Fundo (Southern Brazil) for the interval 1741–2004 was studied by spectral, wavelet and cross-wavelet analyses in order to identify the non-stationary characteristics in tree-ring and sunspot number data. Periods corresponding to the solar cycles of 11, 2...

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Bibliographic Details
Published in:Journal of atmospheric and solar-terrestrial physics 2008-05, Vol.70 (7), p.1025-1033
Main Authors: Rigozo, N.R., Prestes, A., Nordemann, D.J.R., da Silva, H.E., Souza Echer, M.P., Echer, E.
Format: Article
Language:English
Subjects:
Earth, ocean, space
Exact sciences and technology
External geophysics
Physics of the ionosphere
Physics of the magnetosphere
Solar maximum
Solar minimum
Spectral and wavelet analysis
Tree-ring data
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Summary:A tree-ring thickness time series from Passo Fundo (Southern Brazil) for the interval 1741–2004 was studied by spectral, wavelet and cross-wavelet analyses in order to identify the non-stationary characteristics in tree-ring and sunspot number data. Periods corresponding to the solar cycles of 11, 22, and 80 yr were found. The 11 yr solar cycle is detected in tree-ring data only during maximum solar activity interval from 1764 to 1804, 1824 to 1884, and 1924 to 1984. The Hale 22 yr solar cycle was observed in tree-ring wavelet map for the 1764–1864 and 1904–2004 intervals. The Gleissberg solar cycle was also observed in tree-ring wavelet map for the 1844–1904 interval.
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2008.02.002