Detecting trends in 10-day rainfall amounts at five sites in the State of Sao Paulo, Brazil/Deteccao de tendencias em series decendias de precipitacao pluvial em cinco localidades do Estado de Sao Paulo, Brasil

The temporal distribution of the rainfall events within a crop growing season plays a crucial role on the crop yield. In this way, the main goal of this study was to evaluate the presence of climate trends in the 10-day rainfall totalsobtained from five weather stations in the State of Sao Paulo, Br...

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Published in:Acta scientiarum. Technology Vol. 36; no. 4; p. 685
Main Authors: Blain, Gabriel Constantino, Bardin-Camparotto, Ludmila
Format: Journal Article
Language:Spanish
Published: Universidade Estadual de Maringa 01-10-2014
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Abstract The temporal distribution of the rainfall events within a crop growing season plays a crucial role on the crop yield. In this way, the main goal of this study was to evaluate the presence of climate trends in the 10-day rainfall totalsobtained from five weather stations in the State of Sao Paulo, Brazil (1951-2012).The autocorrelation function, the Run test and the Durbin-Watson test indicateda lack of significant serial correlation in theseseries. The wavelet analysis revealed no conclusive evidence of periodicities in the temporal variability of this variable. According to the Mann-Kendall test, most of the 10-day rainfall amounts obtained from the five weather stations shows no significant trends. However, for the locations of States Campinas, Pindorama and Ribeirao Preto, the significant decreasing trends observed during the 2nd and 3rd ten days of October suggests a possible change in the climatic patterns of these locations, which may be linked to a delay in the return of the rainy season. Keywords: Mann-Kendall, climate change, rainy season. A distribuicao temporal dos eventos de precipitacao pluvial (PRE) em cada ano agricola desempenha papel determinante sobre o rendimento das culturas. Com isso, o objetivo do trabalho foi avaliar a presenca de tendencias climaticas nos totais decendiais desse elemento meteorologico em cinco localidades do Estado de Sao Paulo (1951-2012). A funcao auto-correlacao e os testes Run e DurbinWatson indicaram inexistencia de significativas correlacoes seriais nas series do estudo. A analise de ondaleta nao permitiu indicacao conclusiva de periodicidades na variabilidade temporal da PRE. De acordo com o teste de Mann-Kendall a maioria das series decendiais, obtidas a partir dos cinco postos meteorologicos, nao demonstram tendencias significativas em seus dados. Entretanto, as tendencias significativas de diminuicao nos totais decendiais desse elemento meteorologico, observadas nas localidades dos Estados de Campinas, Pindorama e Ribeirao Preto durante o segundo e terceiro decendio do mes de outubro, indicam uma possivel mudanca nos padroes climaticos dessas regioes que podem estar associadas a um atraso na retomada da estacao chuvosa regional. Palavras-chave: Mann-Kendall, mudanca climatica, estacao chuvosa.
AbstractList The temporal distribution of the rainfall events within a crop growing season plays a crucial role on the crop yield. In this way, the main goal of this study was to evaluate the presence of climate trends in the 10-day rainfall totalsobtained from five weather stations in the State of Sao Paulo, Brazil (1951-2012).The autocorrelation function, the Run test and the Durbin-Watson test indicateda lack of significant serial correlation in theseseries. The wavelet analysis revealed no conclusive evidence of periodicities in the temporal variability of this variable. According to the Mann-Kendall test, most of the 10-day rainfall amounts obtained from the five weather stations shows no significant trends. However, for the locations of States Campinas, Pindorama and Ribeirao Preto, the significant decreasing trends observed during the 2nd and 3rd ten days of October suggests a possible change in the climatic patterns of these locations, which may be linked to a delay in the return of the rainy season. Keywords: Mann-Kendall, climate change, rainy season. A distribuicao temporal dos eventos de precipitacao pluvial (PRE) em cada ano agricola desempenha papel determinante sobre o rendimento das culturas. Com isso, o objetivo do trabalho foi avaliar a presenca de tendencias climaticas nos totais decendiais desse elemento meteorologico em cinco localidades do Estado de Sao Paulo (1951-2012). A funcao auto-correlacao e os testes Run e DurbinWatson indicaram inexistencia de significativas correlacoes seriais nas series do estudo. A analise de ondaleta nao permitiu indicacao conclusiva de periodicidades na variabilidade temporal da PRE. De acordo com o teste de Mann-Kendall a maioria das series decendiais, obtidas a partir dos cinco postos meteorologicos, nao demonstram tendencias significativas em seus dados. Entretanto, as tendencias significativas de diminuicao nos totais decendiais desse elemento meteorologico, observadas nas localidades dos Estados de Campinas, Pindorama e Ribeirao Preto durante o segundo e terceiro decendio do mes de outubro, indicam uma possivel mudanca nos padroes climaticos dessas regioes que podem estar associadas a um atraso na retomada da estacao chuvosa regional. Palavras-chave: Mann-Kendall, mudanca climatica, estacao chuvosa.
The temporal distribution of the rainfall events within a crop growing season plays a crucial role on the crop yield. In this way, the main goal of this study was to evaluate the presence of climate trends in the 10-day rainfall totalsobtained from five weather stations in the State of Sao Paulo, Brazil (1951-2012).The autocorrelation function, the Run test and the Durbin-Watson test indicateda lack of significant serial correlation in theseseries. The wavelet analysis revealed no conclusive evidence of periodicities in the temporal variability of this variable. According to the Mann-Kendall test, most of the 10-day rainfall amounts obtained from the five weather stations shows no significant trends. However, for the locations of States Campinas, Pindorama and Ribeirao Preto, the significant decreasing trends observed during the 2nd and 3rd ten days of October suggests a possible change in the climatic patterns of these locations, which may be linked to a delay in the return of the rainy season.
Audience Academic
Author Bardin-Camparotto, Ludmila
Blain, Gabriel Constantino
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Snippet The temporal distribution of the rainfall events within a crop growing season plays a crucial role on the crop yield. In this way, the main goal of this study...
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SubjectTerms Analysis
Climate
Climatic changes
Rain and rainfall
Title Detecting trends in 10-day rainfall amounts at five sites in the State of Sao Paulo, Brazil/Deteccao de tendencias em series decendias de precipitacao pluvial em cinco localidades do Estado de Sao Paulo, Brasil
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