| Full text | |
| Author(s): |
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]
Total Authors: 9
|
| Affiliation: | [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
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | PURE AND APPLIED GEOPHYSICS; v. 169, n. 12, p. 2181-2191, DEC 2012. |
| Web of Science Citations: | 4 |
| 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: 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) | |
| FAPESP's process: | 09/02907-8 - Study sun-earth-climate inter-relationship by means of observation and natural registers |
| Grantee: | Alan Prestes |
| Support Opportunities: | Research Grants - Young Investigators Grants |