Contribuição dos fluxos de umidade em evento de precipitação intensa ocorrido no leste do Nordeste do Brasil em maio de 2017: Um estudo de caso (Contribution of moisture flows in heavy rainfall event occurred in eastern Northeast Brazil in May 2017: A case study)
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. No 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 dos fluxos de umidade associada ao evento de precipitação severa ocorrido na região leste do NEB. … Show more
“…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].…”
Section: Resultsmentioning
confidence: 92%
“…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].…”
Section: Resultsmentioning
confidence: 92%
“…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.…”
This study aims to analyze the atmospheric conditions associated with an event of intense precipitation caused by Easterly Wave Disturbances (EWDs), as well as the environmental conditions related to the mass gravitational movement that occurred between 14th June and 15th June of 2014, in the district of Mãe Luiza, Natal/RN/Brazil. The synoptic conditions, the vertical integrated moisture flux and the energetic behavior in the EWD’s performance phases were analyzed. In addition to these factors, local environmental aspects were assessed, classifying the vulnerability to disaster events in the affected area. Over the days of the operation of the atmospheric system, the daily accumulation of precipitation was greater than 100 mm, with precipitation accumulated in 3 h in the order of 60 mm for the stages of maturation of the disturbance. The main synoptic conditions associated with EWDs were exhibited by the intense anomalies of wind speed and high humidity flux on the east coast of the Northeast, which intensified the influx of moisture into the continent over the period of the operation of the system. Conditions of high to very high vulnerability were identified in the area where the event took place and also in other expressive parts of the district.
“…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].…”
Section: Resultsmentioning
confidence: 92%
“…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].…”
Section: Resultsmentioning
confidence: 92%
“…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.…”
This study aims to analyze the atmospheric conditions associated with an event of intense precipitation caused by Easterly Wave Disturbances (EWDs), as well as the environmental conditions related to the mass gravitational movement that occurred between 14th June and 15th June of 2014, in the district of Mãe Luiza, Natal/RN/Brazil. The synoptic conditions, the vertical integrated moisture flux and the energetic behavior in the EWD’s performance phases were analyzed. In addition to these factors, local environmental aspects were assessed, classifying the vulnerability to disaster events in the affected area. Over the days of the operation of the atmospheric system, the daily accumulation of precipitation was greater than 100 mm, with precipitation accumulated in 3 h in the order of 60 mm for the stages of maturation of the disturbance. The main synoptic conditions associated with EWDs were exhibited by the intense anomalies of wind speed and high humidity flux on the east coast of the Northeast, which intensified the influx of moisture into the continent over the period of the operation of the system. Conditions of high to very high vulnerability were identified in the area where the event took place and also in other expressive parts of the district.
“…As suas tmáx variam entre 27 e 33°C, são capitais vizinhas e, que apresentam um decréscimo na tmáx no período de junho a agosto (Figura 3e, f), que coincide com o período chuvoso no leste do NEB. Nesta época do ano, os distúrbios ondulatórios de leste (DOL) são os responsáveis pela formação de aglomerados de nuvens que causam chuvas nesta região (Ferreira e Mello, 2005;Coutinho e Fish, 2007;Correa et al, 2019). Mas também é inverno no Hemisfério Sul que, em geral, há queda nas temperaturas pela maior frequência de sistemas frontais de maio a setembro (Cavalcanti e Kousky 2003;Andrade 2005), que se aproximam pelo sul do NEB e, acabam de certa forma, influenciando a região de forma indireta (Figuras 3e, 3f).…”
This research aims to analyze and estimate future scenarios of maximum air temperature in the capitals of northeastern Brazil, in order to highlight the importance of climate change today and in the future. For this, rainfall, wind speed, relative humidity and maximum air temperature data were used by the database meteorological activities of the National Institute of Meteorology, of the nine capitals of the northeastern region of Brazil from 1980 to 2019, and the dynamic regression technique that combines the dynamics of time series and the effect of explanatory variables.The main results showed that the dynamic regression model satisfactorily adjusted the association between meteorological variables.Trend (without lag) and seasonality (lag) functions were considered in all capitals, presenting the occurrence of different lags according to the capital and the variable. Thus, the highest temperatures among the capitals analyzed occurred in Teresina/PI and the least high, in Salvador/BA. In general terms, the optimistic scenarios (C1) presented temperature between 32.5 and 35 ºC, the pessimists (C2) between 37.5 ºC and extremes (C3) 35 and 39 ºC, evidencing that all future scenarios present danger to the population. It is expected that the results obtained can help public policies.
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