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Solar-Terrestrial Signal Record in Tree Ring Width Time Series from Brazil |
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| Authors: | Nivaor Rodolfo Rigozo Cláudio Sergio Lisi Mário Tomazello Filho Alan Prestes Daniel Jean Roger Nordemann Mariza Pereira de Souza Echer Ezequiel Echer Heitor Evangelista da Silva Valderez F Rigozo |
| Institution: | 1. Centro Regional Sul de Pesquisas Espaciais (CRS/INPE), Santa Maria, RS, 97105-900, Brazil 2. Universidade Federal de Sergipe (UFS), S?o Cristóv?o, SE, 49100-000, Brazil 3. Escola Superior de Agricultura Luiz de Queiroz, Universidade de S?o Paulo, Piracicaba, SP, 13418-900, Brazil 4. Universidade do Vale do Paraíba (UNIVAP), S?o José dos Campos, SP, Brazil 5. Instituto Nacional de Pesquisas Espaciais (INPE), POB 515, S?o José dos Campos, SP, 12201-970, Brazil 6. LARAMG Laboratório de Radioecologia e Mudan?as Globais,Departamento de Biofísica e Biometria, Universidade do Estado do Rio de Janeiro. Pavilh?o Haroldo Lisboa da Cunha, Subsolo. Rua S?o Francisco Xavier, 524. Maracan?, Rio de Janeiro, RJ, 20550-013, Brazil |
| Abstract: | This work investigates the behavior of the sunspot number and Southern Oscillation Index (SOI) signal recorded in the tree ring time series for three different locations in Brazil: Humaitá in Amaz?nia State, Porto Ferreira in S?o Paulo State, and Passo Fundo in Rio Grande do Sul State, using wavelet and cross-wavelet analysis techniques. The wavelet spectra of tree ring time series showed signs of 11 and 22?years, possibly related to the solar activity, and periods of 2–8?years, possibly related to El Ni?o events. The cross-wavelet spectra for all tree ring time series from Brazil present a significant response to the 11-year solar cycle in the time interval between 1921 to after 1981. These tree ring time series still have a response to the second harmonic of the solar cycle (5.5?years), but in different time intervals. The cross-wavelet maps also showed that the relationship between the SOI x tree ring time series is more intense, for oscillation in the range of 4–8?years. |
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