Climatologia dos eventos extremos de precipitação em Maceió, Alagoas

Abstract

Located east of the Northeast of Brazil (NEB), Maceió is vulnerable to the consequences of Extreme Precipitation Events (EEP), a portion where EEP are more frequent and intense. Thus, the objective was to: establish the monthly and annual climatology of precipitation in Maceió. Quantify daily, monthly and annual precipitation extremes. Check whether there is a significant trend in the frequency and intensity of EEP. For this, monthly precipitation data in Maceió, from 1980 to 2020, from the National Institute of Meteorology (INMET) were used. To obtain the data, descriptive statistics are used to characterize rainfall. The Mann-Kendall non-parametric test was used to define whether there is a monthly and annual precipitation trend in Maceió. The daily EEP defined by the percentile technique, considers the values that the percentile equals or exceeds 95%. The main results: April to July are characterized as the rainiest period, with a monthly average of 265,3 mm, July represents the rainiest (296,6 mm). For annual precipitation, the wettest year is 2017 with accumulated precipitation of 3005,8 mm. For maximum daily precipitation, June presents the highest value, 187,8 mm/day, this one was dated June 6, 2010. Between April and July, the P95 value varies between 44.7 and 50.6 mm/day, with May being the month with the highest P95 value. It was possible to verify that there was no significant trend in daily, monthly and annual EEP in Maceió, Alagoas.