Solar-Terrestrial Signal Record in Tree Ring Width Time Series from Brazil

Autor(es)

Rigozo, Nivaor Rodolfo ^[1] ; Lisi, Claudio Sergio ^[2] ; Tomazello Filho, Mario ^[3] ; Prestes, Alan ^[4] ; Roger Nordemann, Daniel Jean ^[5] ; de Souza Echer, Mariza Pereira ^[5] ; Echer, Ezequiel ^[5] ; da Silva, Heitor Evangelista ^[6] ; Rigozo, Valderez F. ^[1]

Afiliação do(s) autor(es)

^[1] Ctr Reg S Pesquisas Espaciais CRS INPE, BR-97105900 Santa Maria, RS - Brazil

^[2] Univ Fed Sergipe, BR-49100000 Sao Cristovao, SE - Brazil

^[3] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[4] Univ Vale Paraiba UNIVAP, Sao Jose Dos Campos, SP - Brazil

^[5] Inst Nacl Pesquisas Espaciais, BR-12201970 Sao Jose Dos Campos, SP - Brazil

^[6] Univ Estado Rio de Janeiro, Dept Biofis & Biometria, LARAMG Lab Radioecol & Mudancas Globais, BR-20550013 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PURE AND APPLIED GEOPHYSICS; v. 169, n. 12, p. 2181-2191, DEC 2012.
• Citações Web of Science: 4

Resumo

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: Humaita in Amaznia State, Porto Ferreira in So 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 Nio 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. (AU)

• Processo FAPESP: 07/52533-1 - Estudo de ondas de plasma em magnetosferas planetárias
• Beneficiário: Ezequiel Echer
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/02907-8 - Estudo das inter-relações sol-terra-clima por meio de registros observacionais e naturais
• Beneficiário: Alan Prestes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores