Análise de Detecção de Variabilidades Climáticas com Base na Precipitação nas Bacias Hidrográficas do Sertão de Pernambuco (Analysis of Climate Variability Detection Based on Watershed Precipitation in the Sertão of Pernambuco)
DOI:
https://doi.org/10.26848/rbgf.v5i3.232877Abstract
Os padrões climáticos estão mudando em todo planeta e prevê-se, como impacto das mudanças climáticas, a alteração na frequência da precipitação e secas mais intensas e prolongadas, particularmente em áreas áridas e semiáridas. Desta forma, estudar a vulnerabilidade e os impactos da potencial modificação climática sobre os recursos hídricos no Nordeste do Brasil é um assunto estratégico para o país, a fim de planejar medidas mitigadoras em associação com as ações existentes de gerenciamento dos recursos hídricos. Nesse contexto, o presente artigo aborda a questão das tendências de mudanças climáticas no semiárido nordestino, sertão de Pernambuco, com recorte espacial das bacias dos rios Brígida e Pajeú. Foram analisadas séries históricas de precipitação pluviométrica de 19 postos, espacialmente distribuídos na área das bacias, no período de 1964 a 2004. . O software utilizado para o processamento e controle de qualidade dos dados foi o RClimdex (2.11.1). Os resultados mostraram mudança no padrão de precipitação sobre as bacias em estudo, que evidenciaram a diminuição da precipitação total anual e aumento dos dias secos consecutivos, colaborando, dessa forma, para a escassez hídrica e impactos na agricultura local.
Palavras-chave: Precipitação pluviométrica, RClimdex, bacia hidrográfica, agricultura.
Analysis of Climate Variability Detection Based on Watershed Precipitation in the Sertão of Pernambuco
ABSTRACT
The weather patterns are changing all over the planet and it is expected, as the impact of climate change, the change in frequency of precipitation and more intense and prolonged drought, particularly in arid and semiarid regions. Thus, to study the vulnerability and the potential impacts of climate change on water resources in northeastern Brazil is a strategic issue for the country, to plan potential mitigation measures in combination with the existing shares management of water resources. In this context, this paper addresses the issue of climate change trends in the semiarid northeast, interior of Pernambuco, with spatial area of river basins and Bridget Pajeu. We analyzed time series of rainfall of 19 stations spatially distributed in the basin in the period 1964 to 2004. . The software used for processing and quality control data was RClimdex (2.11.1). The results showed changes in the pattern of precipitation over the basins under study, which demonstrated a decrease in annual rainfall and an increase of consecutive dry days, contributing thus to the water scarcity and impacts on local agriculture.
Keywords: Rainfall, RClimdex, hidrographic basin, agriculture.
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Copyright (c) 2012 Janaina Maria Oliveira de Assis, Maria do Carmo Martins Sobral, Werônica Meira de Souza
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