Estudo De Caso De Contribuição Do Fluxo De Umidade Em Evento De Precipitação Intensa Ocorrido No Leste Do Nordeste Do Brasil Em Maio De 2017

Abstract

A observação de distribuição espacial e temporal do regime de chuvas da região Nordeste do Brasil (NEB) torna-se um desafio devido sua grande variabilidade no tempo e no espaço. Durante o período de 25 a 29 de maio de 2017 foram registrados casos de chuvas intensas na parte leste do NEB, principalmente entre os estados de Alagoas e de Pernambuco. Desta forma, objetivo deste trabalho consistiu em verificar a contribuição do fluxo de umidade associada ao evento de precipitação severa ocorrido na região leste do NEB Especificamente, pretende-se averiguar as características física e sinótica de referido evento. Para tanto, foram utilizados dados de estações pluviométricas automáticas do Centro Nacional de Monitoramento e Alertas de Desastres Naturais (CEMADEN), imagens de satélite GOES-13 e reanálises pertencentes ao European Centre for Medium-Range Weather Forecasts (ECMWF), do conjunto de reanálise ERA-5. Os resultados obtidos desta pesquisa conseguiram mostrar que o transporte de umidade integrado na vertical sobre a costa leste do NEB foi bastante intenso durante o período em que o sistema de precipitação esteve no estágio de maturação.Palavras-chave: NEB ERA-5; Chuva intensa; Transporte de umidade. Contribution of moisture flows in heavy rainfall event occurred in eastern Northeast Brazil in May 2017: A case study A B S T R A C TThe observation of spatial and temporal distribution of the rainfall regime of the Northeast of Brazil (NEB) becomes a challenge due to its great variability in time and space. In the period from May 25 to 29, 2017, heavy rains occurred in the eastern part of the NEB, mainly between the states of Alagoas and Pernambuco. Thus, the objective of this work was to verify the contribution of the moisture flow associated to the event of severe precipitation occurred in the eastern region of the NEB. Specifically, it is intended to ascertain the physical and synoptic characteristics of said event. In order to do so, we used data from automatic rain gauges of the National Center for Natural Disaster Monitoring and Alarms (CEMADEN), GOES-13 satellite images and reanalysis from the European Center for Medium-Range Weather Forecasts (ECMWF) ERA-5. The main results showed that the vertical moisture transport presented strong nuclei of moisture convergence in the Atlantic Ocean towards the study area, when the precipitation system was in the maturation stage.Keywords: Transport of moisture; Synoptic analysis; Extreme event; ERA-5.

Intense Precipitation and Area of Risk: A Case Study of Mass Movement in the City of Natal, Brazil

“…Researchers analyzed the moisture flux of precipitation system events on the NEB east coast and observed that the region is characterized by the convergence of humidity borne by the trade winds, east waves and breezes associated with the topography, in addition to the circulation and the transport of moisture from the ocean towards the continent, where it contributes to feeding the convection over the surface. This caused the occurrence of landslides in the respective regions of those studies [31,32].…”

“…the transport of moisture from the ocean towards the continent, where it contributes to feeding the convection over the surface. This caused the occurrence of landslides in the respective regions of those studies [31,32].…”

“…Several studies developed regarding the east coast of Northeast Brazil have indicated the EWD is an atmospheric system that propels heavy rains [26,31,32]. The factors described above exacerbated the natural disaster caused by excessive precipitation.…”