SciELO - Scientific Electronic Library Online

 
vol.35 número especialVórtice Ciclônico em Altos Níveis e Corrente de Jato do Nordeste Brasileiro sobre o Estado de Alagoas: Padrões de Circulação e PrecipitaçãoEstimativa e Espacialização da Erosividade em Mesorregiões Climáticas no Estado de Alagoas índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Meteorologia

versão impressa ISSN 0102-7786versão On-line ISSN 1982-4351

Resumo

BONFIM, Osmar Evandro Toledo; SILVA, Djane Fonseca da; KAYANO, Mary Toshie  e  ROCHA, Lucas Henrique dos Santos. Analysis of Extreme Climate Events and Their Climate Causes for Risks Reduction in Aguapeí and Peixe Hydrographic Basins, São Paulo, Brazil. Rev. bras. meteorol. [online]. 2020, vol.35, n.spe, pp.755-768.  Epub 25-Jan-2021. ISSN 1982-4351.  https://doi.org/10.1590/0102-7786355000004.

In order to improve our understanding on the extreme events of the hydrographic basins of river Aguapeí and river Peixe, using a variety of statistical analyzes, the objective of this work was to detect oscillations, systems or dominant phenomena that influence rainfall and the occurrence of extreme events in these hydrographic basins, to identify climatic trends, and groups with similar rainfall behavior using the Cluster analysis. In addition, SPI was used to analyze local extreme events, the variations of which were associated with the El Niño- South Oscillation (ENSO) Canonico or Modoki, and the Prp index was subjected to Wave Analysis to identify the climatic causes of rainfall variability. The wavelet analyses identified significant peaks at the 0.25 and 0.5 years although a 22-year time scale predominates during almost all years. Years with high rainfall rates are due to the association of different time scale phenomena, whereas their absences cause low rainfall years. A higher frequency of drought events was found, however, the occurrence of rainy events was more intense. Extreme rainy events occur mainly in canonical El Niño years, and light drought events in canonical La Niña years.

Palavras-chave : wave analysis; ENOS Canonical; ENOS Modoki; SPI.

        · resumo em Português     · texto em Português     · Português ( pdf )