Estimativa dos índices de extremos climáticos e tendências da precipitação com base de dados do Tropical Rainfall Mensuring Mission para o estado de Alagoas

• Autor(a) principal: Lima, Stefany Gonçalves
• Data de Publicação: 2020
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/7541
• topic: Climatologia; Precipitação; Sensoriamento remoto; Tropical Rainfall Mensuring Mission - TRMM; Alagoas - Brasil; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

The spatio-temporal variability of precipitation, the non-comprehensive distribution of pluviometric stations, registration errors and data discontinuity are some factors that represent obstacles in the characterization of precipitation regimes in a locality. In this context, remote sensing techniques, with the use of satellites, have been an alternative for the monitoring and characterization of precipitation levels. Taking these factors into account, the present study aimed to analyze the spatio-temporal behavior of precipitation over the state of Alagoas, in the period corresponding to the years 1998 to 2018, six (6) indexes of climatic extremes related to precipitation were calculated, through the statistical methodology of the RClimDex software (1.0). Further, it used values of daily precipitation estimated by the database of the National Aeronautics and Space Administration (NASA), the product 3B42-v7 of the Tropical Rainfall Measuring Mission (TRMM) was chosen for evaluation. Considering the index of extreme weather consecutive dry days (CDD), a positive trend variability was found, with an average of 75 days per year, for the mesoregion of Sertão Alagoano, which, all pixels on the same showed statistical significance of up to 99%. For the Consecutive Wet Days (CWD) index, no relevant significant variability was presented. However, the observational evidence shows that there is a bad temporal distribution of precipitation for the state. The results of the trend of the Annual Total Wet-day Precipitation (PRCPTOT) showed, in full, reduction trend, it was still observed, in the spatialization of the data, a contrast of statistical significance, distributed throughout the mesoregions of the East and Agreste of the state of Alagoas with trends in the -26mm per year. The analysis of the Number of Days with Precipitation Equal or Above 10, 20 and 25mm (R10, R20 and R25, respectively) did not show probable increases in occurrence, in addition to similar behavior when comparing PRCPTOT trends. Considering the results and the estimates with data from the TRMM satellite to be satisfactory, the results of the observational analysis allowed attesting quantitative and spatial changes in precipitation over time for the state of Alagoas.