Analise da frequência e intensidade da precipitação nos aeroportos de Ponta Pelada E Eduardo Gomes na cidade de Manaus - AM

Abstract

This study aimed to evaluate the frequency and intensity of precipitation for two regions of the city of Manaus - AM in the period 2009-2016. For this, precipitation data of two stations, the Eduardo Gomes Airport (AEG) and Ponta Pelada Airport (APP) locates in the south and northwest of the city of Manaus were used. The methodology consisted of evaluating seasonal and diurnal variability of rainfall in terms of intensity and frequency. Initially, the monthly rainfall accumulation of the two regions was calculated for each year separately, in order to compare with the climate of Manaus. Then, monthly and daytime frequency of precipitation and the seasonal distribution of the insensitive of the rain events were calculated. In general, the total monthly precipitation for the AEG and APP followed the seasonal precipitation of the city of Manaus. However, in some years, values below or above monthly climatology are observed, possibly associated to interannual variability of the El Niño-Southern Oscillation phenomenon. Concerning the classification by rain intensity, in the two regions the highest frequencies occur in the very low precipitation category (0.2 - 1.6 mm) during the January, February and March (JFM) trimester. Events considered extreme (> 18 mm) also occur more frequently in the JFM period, but with smaller numbers of occurrences. The frequency of monthly rainfall showed a higher occurrence of events in the rainy season of the Amazon Region (December to April), with higher values in April, while that in period from June to November (dry season) shows the lowest occurrences, with lower values in September. In relation to the daytime frequency, the highest frequency occurs from 10-15 local time and secondary peaks occur by dawn (00 local time), morning (06 local time) and night (18 local time) on most months.