Avaliação da precipitação da microrregião de João Pessoa-PB

Abstract

The Brazilian Northeast (NEB) presents great variability in its precipitation, determined by atmospheric systems and physiographic factors, causing irregularities in dry and rainy periods. In this way, the objective of this work is to analyze the space-time variation of the monthly and annual precipitation, identifying the dry and rainy periods of the João Pessoa microregion, located in the State of Paraíba.Rainfall data were made available by the Paraíba State Water Management Executive Agency (AESA), and to identify the dry and rainy periods the Rainfall Anomaly Index (IAC) wasused as tool. Data from 11 (eleven)pluviometric stations distributed in the João Pessoa micro-region were used, with a historical series of 21 years.From these data it was observed that the micro-region of João Pessoa has a rainy period of six months, since it started in March and extend is to August, with June being the month with the highest rainfall. In contrast, the dry period is from September to February, with November being the month with the lowest precipitation index. With the help of the Rainfall Anomaly Index (IAC) applied in thehistorical series, it asobserved that between 1994 and 2014 it presented 12 (twelve) rainy years and 9 (nine) dry years.