Análise de Aspectos Meteorológicos Sobre o Nordeste do Brasil em Anos de El Niño e La Niña (Analysis of Meteorological Aspects on the Northeast of Brazil in El Niño and La Niña Years)
DOI:
https://doi.org/10.26848/rbgf.v4i3.232719Keywords:
BRAMS, El Niño/La Niña, precipitaçãoAbstract
Na elaboração desse trabalho, foram analisadas as diferenças entre os valores das variáveis de temperatura da superfície, vapor d’água e energia potencial convectiva disponível (CAPE) em dois anos de diferentes precipitações pluviométricas na região Nordeste do Brasil (NEB), um ano de El Niño (1998) e um ano de La Niña (2008). O estudo refere-se ao trimestre fevereiro-março-abril (FMA), período chuvoso no Norte do NEB, região mais afetada pelos eventos de El Niño e La Niña. O modelo numérico Brazilian developments on the Regional Atmospheric Modeling System – BRAMS foi utilizado para simular os campos das variáveis referidas. Para a inicialização do modelo BRAMS foram utilizados dados de reanálises 1 do National Centers for Environment Prediction/National Center for Atmospheric Research (NCEP/NCAR). Além disso, foram utilizados dados de temperatura da superfície do mar (TSM) observada, que foi incluída no modelo como condições de contorno sobre oceano. Os resultados obtidos mostraram que se pode reproduzir aspectos meteorológicos durante eventos de El-Niño/Oscilação Sul, com a utilização do BRAMS. A temperatura da superfície e o vapor d’água apresentaram seus maiores valores no ano seco de 1998, principalmente no Norte do NEB. Os maiores valores da CAPE foram observados na região semiárida no período de La Niña.
Palavras-chave: BRAMS, El Niño/La Niña, precipitação
Analysis of Meteorological Aspects on the Northeast of Brazil in El Niño and La Niña Years
ABSTRACT
In the development of this study, have been analyzed the differences between the values of surface temperature, precipitable water and convective available potential energy (CAPE) in two different rainfalls years in Northeast Brazil (NEB), an El Niño year (1998) and a La Niña year (2008). The study refers to the quarter from February to March-April (FMA), the rainy season in northern NEB region most affected by El Niño and La Niña. The numerical model Brazilian developments on the Regional Atmospheric Modeling System - BRAMS was used to simulate the fields of the mentioned variables. For the initialization of the BRAMS model reanalysis data were used by the National Centers for Environment Prediction / National Center for Atmospheric Research (NCEP / NCAR). In addition, have been used data from the observed sea surface temperature (SST), which was included in the model as boundary conditions on the ocean. The results showed that meteorological aspects can play well during ENSO events, using the BRAMS. Surface temperature and water vapor presented their highest values in the dry year of 1998, mainly in northern NEB.The highest values of CAPE were observed in the semiarid region in the rainy season.
Keywords: BRAMS, El Niño/La Niña, precipitation
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Copyright (c) 2011 Juliana Larise Mendonça Freire, Jeane Rafaele Araújo Lima, Enilson Palmeira Cavalcanti
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