RAINFALL VARIABILITY AND TRENDS IN THE SEMARID REGION OF PERNAMBUCO, BRAZIL
DOI:
https://doi.org/10.14393/RCG2610876911Keywords:
Rainfall, Statistics, Trend, BreakpointAbstract
Rainfall is essential for sustaining ecosystem balance and the hydrological cycle. This study analyzed 43 years of rainfall data (January 1975–December 2017) from the Bebedouro Agrometeorological Station – Petrolina (PE), Brazil. The objective was to perform a descriptive and exploratory assessment of precipitation patterns and evaluate trends using the Mann-Kendall and Pettitt tests at monthly and annual scales. Results show that the mean annual accumulated rainfall was 484.51 mm, with the wettest months occurring from January to April and in December, and the driest months from July to September. The mean coefficients of variation for annual rainfall were 44.19% during the rainy season and 55.84% during the dry season, ranging from 48.84% to 51.16% in years with mean annual coefficients of variation of ±84.56% and ±108.57%. The Mann-Kendall test (MK) detected a decreasing trend exclusively in March, while the Pettitt test (P) identified significant breakpoints. Analysis of monthly trends during the dry season revealed rainfall consistently below the monthly average. Overall, the Mann-Kendall and Pettitt tests for the dry season and annual data indicate significant abrupt changes in rainfall patterns.
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Copyright (c) 2025 Givanildo de Gois, Paulo Miguel de Bodas Terassi, Josimar da Silva Freitas, Sandra Bezerra da Silva, Roberta Fernanda da Paz de Souza Paiva, Djailson Silva da Costa Júnior, Kelly Alonso Costa, Welington Kiffer de Freitas, Bruno Serafini Sobral, Marcelo Alves Muniz, Jessica Guerra Inácio de Oliveira, Juaneza Barroso Falcao, Núbia Valéria Ferreira

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