An overview of precipitation climatology in Brazil: space-time variability of frequency and intensity associated with atmospheric systems

Autor(es)

Luiz-Silva, Wanderson ^{[1, 2]} ; Oscar-Junior, Antonio Carlos ^[3] ; Cavalcanti, Iracema Fonseca Albuquerque ^[4] ; Treistman, Felipe ^[5]

Afiliação do(s) autor(es)

^[1] Elect Energy Res Ctr CEPEL, Dept Energy Optimizat & Environm DEA, Rio De Janeiro - Brazil

^[2] Fed Univ Rio de Janeiro UFRJ, Alberto Luiz Coimbra Inst Grad Studies & Res Engn, Rio De Janeiro - Brazil

^[3] Univ State Rio de Janeiro UERJ, Dept Phys Geog DGF, Rio De Janeiro - Brazil

^[4] Natl Inst Space Res INPE, Ctr Weather Forecasting & Climate Studies CPTEC, Sao Paulo - Brazil

^[5] Natl Elect Syst Operator ONS, Dept Planning DPL, Rio De Janeiro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES; v. 66, n. 2, p. 289-308, JAN 25 2021.
• Citações Web of Science: 1

Resumo

The climatic characteristics of Brazil present marked spatial and temporal precipitation contrasts, which are reviewed according to four main indices: PRCPTOT - total precipitation; Rmm - number of days with precipitation; Rx1day - maximum 1-day precipitation; and SDII - simple precipitation intensity index. The study used data for 12 hydrographic basins from 1975 to 2005. The seasonal distribution of these precipitation indices in Brazil is summarized concerning the main atmospheric systems acting in South America. The austral summer and autumn present the maximum PRCPTOT, Rmm, and Rx1day, related to the South American Monsoon System and Intertropical Convergence Zone. However, in the winter, the extreme northern and eastern coast also present high Rx1day. Maximum values of SDII occur during the four seasons in southwestern Brazil, related to mesoscale convective complexes. Precipitation anomalies are also affected by the sea surface temperature of the Tropical Southern Atlantic and Equatorial Pacific Oceans. (AU)

• Processo FAPESP: 15/50687-8 - Serviços climáticos através de co-produção de conhecimento: uma iniciativa europeia e da América do Sul para fortalecer as ações de adaptação da sociedade a eventos extremos
• Beneficiário: Iracema Fonseca de Albuquerque Cavalcanti
• Modalidade de apoio: Auxílio à Pesquisa - Temático