Wavelet Analysis of Solar-ENSO Imprints in Tree Ring Data from Southern Brazil in the Last Century

Authors: Rigozo N.R.¹; Vieira L.E.A.²; Echer E.²; Nordemann D.J.R.²

Source: Climatic Change, Volume 60, Number 3, October 2003 , pp. 329-340(12)

Publisher: Springer

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Abstract:

In order to study the imprint of solar and ENSO signals on terrestrial archives, the wavelet spectrum analysis was applied to solar-geophysical indices and tree ring data. Time series of Sunspot Number (SSN), southern oscillation index (SOI) and tree-ring indices from Southern Brazil, for the period 1876–1991, were used in this work. The 11-year solar cycle was present during the whole period in tree ring data, being more intense during 1930–1980, in agreement with an earlier study that was performed for the same region but a different time range (1836–1996). ENSO effects on tree ring data from Southern Brazil were studied by the first time in this work using wavelet analysis. Short-term variations, between 2–5 years, are also present in tree ring data. This represents the signature of ENSO events and was also observed in the SOI, as expected. The cross-wavelet spectrum analysis shows that both solar and climatic factors are recorded in tree ring data.

Language: English

Document Type: Research article

Affiliations: 1: Instituto Nacional de Pesquisas Espaciais (INPE), POB 515 – CEP 12201-970, São José dos Campos, Brazil E-mail: rodolfo@dge.inpe.br 2: Instituto Nacional de Pesquisas Espaciais (INPE), POB 515 – CEP 12201-970, São José dos Campos, Brazil

Publication date: 2003-10-01