Analysis of the seasonality of rain in Brazil from 1990 to 2022
Análise da sazonalidade das chuvas no Brasil no período de 1990 a 2022
Palavras-chave:
Clima variability, Extreme precipitation, Seasonality of precipitation, Precipitation indexResumo
Water resources are subject to hydroclimatic and spatio-temporal variations. This article aimed to analyze the seasonality of rainfall in Brazil. Precipitation data from 1306 rain gauge stations with data from 1990 to 2022. The precipitation seasonality index (PSI) was determined to evaluate the spatial and temporal variation in seasonality. The spatialization of ISP values was carried out using the geostatistical method of ordinary kriging. The ISP values found throughout the Brazilian territory vary from 0.273 to 1.176. This indicates that Brazil has humid regions with precipitation well distributed throughout the months throughout the year, to arid regions, with few months with rain. The lowest seasonal variability was found in the three states in the South region, on the coast of the states in the Southeast region and in the North region near the Amazon forest. The greatest seasonal variability occurs markedly in the Northeast region, close to the semi-arid Northeast, with long periods of drought
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