Análise da Água Precipitável e dos Fluxos de Calor Latente/Sensível no Início da Estação Chuvosa das Regiões Sudeste e Centro-Oeste do Brasil
DOI:
https://doi.org/10.5902/2179460X11602Abstract
A estação chuvosa nas regiões Sudeste e Centro-Oeste do Brasil é o objeto de estudo da presente pesquisa, que incide sobre a caracterização das condições atmosféricas de umidade e fluxos de calor (latente e sensível) nos momentos que precedem o início das chuvas nessas regiões para o período 2000-2010. Dados de reanálise água precipitável da Climate Forcast Reanalysis System (CFSR) foram utilizados para identificar o início da estação chuvosa, usando a metodologia proposta por Zeng e Lu (2004). Esta metodologia utiliza o Índice Normalizado de Água Precipitável (NPWI), que identifica o instante em que ocorre o início da estação chuvosa, a partir do momento em que o índice superior ao limiar 0618. Esta data foi utilizada para observar a evolução dos fluxos de calor durante o início da estação chuvosa. Os resultados apontaram as datas para o início da estação chuvosa, perto das datas indicadas na literatura, durante a primavera, entre os meses de outubro e novembro, precedido por um aumento gradual na quantidade de água precipitável na atmosfera destas regiões, levando a uma diminuição do fluxo de calor sensível uma vez que a radiação solar atua principalmente para evaporar do que para aquecer as superfícies.Downloads
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