Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/3674
Título: Downward longwave radiation estimates for clear-sky conditions over northeast Brazil
Autor(es): SANTOS, CARLOS ANTONIO COSTA DOS
SILVA, BERNARDO BARBOSA DA
RAO, TANTRAVAHI VENKATA RAMANA
Prakki Satyamurty
Antonio Ocimar Manzi
ISSN: 0102-7786
Revista: Revista Brasileira de Meteorologia
Volume: 26
Resumo: The main objective of this paper is to assess the performance of nine downward longwave radiation equations for clear-sky condition and develop a locally adjusted equation using the observed vapor pressure and air temperature data. The radiation and atmospheric parameters were measured during the months of October 2005 to June 2006 at a micrometeorological tower installed at the experimental site in a banana orchard in the semiarid region of Northeast Brazil. The comparative statistics for the performance of the downward longwave radiation calculation models during daytime and nighttime compared to measured data have shown that the parameterizations with more physical foundations have the best results. The locally adjusted equation and Sugita and Brutsaert model developed in 1993 showed errors less than 1.0% in comparison with measured values. Downward longwave radiation is one of the most expensive and difficult component of the radiation budget to be monitored in micrometeorological studies. Hence, the locally adjusted equation can be used to estimate downward longwave energy, needed as input to some agricultural and hydrological models, in semi-arid regions of the Northeast Brazil, where this component is not monitored.
URI: http://repositorio.inpa.gov.br/handle/123/3674
ISSN: 0102-7786
DOI: https://dx.doi.org/10.1590/s0102-77862011000300010
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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