Modes of variability of precipitation in the State of São Paulo: local, regional and remote connections

Author(s)

Guilherme Henrique Gabriel

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Geociências
• Defense date: 2017-12-04

Examining board members

Lucí Hidalgo Nunes; José Antonio Marengo Orsini; Daniel Henrique Candido; Raul Reis Amorim; Archimedes Perez Filho

• Advisor: Lucí Hidalgo Nunes

Abstract

This study aimed to identify possible changes in the precipitation regime in the State of São Paulo, Brazil, evaluating data from 79 pluviometric stations between 1973 and 2012, analyzed in two groups (1973 to 1992 and 1993 to 2012), which were compared and observed for changes. Annual evaluations were conducted, using techniques of parametric statistics (evaluation of the two gamma distribution parameters) and the quantile technique (0.05 percentiles for negative extremes and 0.95 for positive extremes). In order to understand rainfall variability in the state of São Paulo, teleconnection indexes and South American Convergence Zone (SACZ) behavior were also analyzed. The results are presented as maps and show that the rainfall distribution patterns in the State of São Paulo generally indicate an increase in the irregular rainfall distribution and the occurrence of extreme events in recent years. In addition, strong relationships between the Southern Oscillation Index, as well as the occurrence of SACZ and rainfall amounts in São Paulo were observed (AU)

• FAPESP's process: 15/11035-5 - Rainfall variability modes in the State of São Paulo, Brazil: local, regional and remote connections
• Grantee: Guilherme Henrique Gabriel
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)