Wavelet Analysis of Solar-ENSO Imprints in Tree Ring Data from Southern Brazil in the Last Century |
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| Authors: | N R Rigozo L E A Vieira E Echer D J R Nordemann |
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| Institution: | (1) Instituto Nacional de Pesquisas Espaciais (INPE), POB 515 –, CEP 12201-970 São José dos Campos, Brazil |
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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 thesame region but a different time range (1836–1996). ENSO effects on treering data from Southern Brazil were studied by the first time in this work using wavelet analysis. Short-term variations, between 2–5 years, arealso 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. |
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