Tendência do Número de Dias de Chuva no Estado do Mato Grosso do Sul e Sua Relação com o Fenômeno ENOS (Trend in Number of Days of Precipitation in the State of Mato Grosso do Sul and Its Relationship with ENSO Phenomenon)
DOI:
https://doi.org/10.26848/rbgf.v5i5.232824Keywords:
NDC, El Niño, precipitação pluviométricaAbstract
Vários sistemas atmosféricos da América do Sul, com mais de um tipo de regime pluviométrico, convergem no estado do Mato Grosso do Sul. Assim, obtendo-se relevância nos estudos que focam séries históricas pluviométricas de modo a se entender sua tendência utilizando sua correlação com diferentes dados climatológicos. Com o objetivo de analisar a tendência mensal e anual do Número de Dias de Chuva (NDC) no estado do Mato Grosso do Sul, realizou-se um estudo de sua variabilidade extrema e a sua possível correlação com o fenômeno ENOS de intensidade moderada ou forte. Foram utilizadas médias mensais e anuais do NDC das séries históricas de dados pluviométricos obtidos da Rede Hidrometeorológica Nacional, da Agência Nacional de Águas e do Serviço Geológico do Brasil. A série histórica utilizada foi de 30 anos (1977 a 2006). Para o tratamento estatístico calculou-se as médias temporais do número de dias com precipitação de 92 estações pluviométricas distribuídas no estado do Mato Grosso do Sul. Observou-se que apenas o mês de outubro apresentou tendência de aumento do NDC, para a série histórica estudada, ficando os outros meses e a média geral anual, com tendência de decréscimo no NDC do estado Sul-Mato-Grossense. Como resultados são apresentados gráficos com as tendências de NDC para cada mês e anual, correlacionados com a intensidade do ENOS, além do histograma mensal com a média de 30 anos e para cada uma das três décadas.
Palavras-chave: NDC, El Niño, precipitação pluviométrica.
Trend in Number of Days of Precipitation in the State of Mato Grosso do Sul and Its Relationship with ENSO Phenomenon
ABSTRACT
Several weather systems in South America, with more than one type of rainfall, converge in the state of Mato Grosso do Sul. Thus, obtaining relevant in studies that focus on historical rainfall series in order to understand its trend using its correlation with different climatological data. In order to analyze the trend of monthly and annual Number of Days of Precipitation (NDP) in the state of Mato Grosso do Sul, there was a study of its variability and correlation with ENSO. We used monthly and annual averages of the NDP of the time series of rainfall data obtained from the National Hydrometeorological Network, the National Water Agency and the Geological Survey of Brazil. The series used was 30 years (1977-2006). The statistic calculated the mean time the number of days with rainfall of 92 rainfall stations distributed in the state of Mato Grosso do Sul was observed that only the month of October tended to increase the NDP for the series studied, leaving the other months and the average annual general decreasing trend with NDP in the state of Mato Grosso do Sul. Results are presented in graphical trends NDP for each month and year, correlated with the intensity of ENSO, and the histogram with the monthly average of 30 years and for each of three decades.
Keywords: NDP, El Niño, rainfall.
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Copyright (c) 2013 Francisco Marcuzzo, Nayhara de Lima Oliveira, Murilo Raphael Dias Cardoso
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