Downward longwave radiation estimates for clear-sky conditions over northeast Brazil
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.
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Sociedade Brasileira de Meteorologia
2011
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oai:scielo:S0102-778620110003000102011-11-11Downward longwave radiation estimates for clear-sky conditions over northeast BrazilSantos,Carlos Antonio Costa dosSilva,Bernardo Barbosa daRao,Tantravahi Venkata RamanaSatyamurty,PrakkiManzi,Antonio Ocimar Radiation balance banana crop semiarid evapotranspiration 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.info:eu-repo/semantics/openAccessSociedade Brasileira de MeteorologiaRevista Brasileira de Meteorologia v.26 n.3 20112011-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862011000300010en10.1590/S0102-77862011000300010 |
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Santos,Carlos Antonio Costa dos Silva,Bernardo Barbosa da Rao,Tantravahi Venkata Ramana Satyamurty,Prakki Manzi,Antonio Ocimar |
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Santos,Carlos Antonio Costa dos Silva,Bernardo Barbosa da Rao,Tantravahi Venkata Ramana Satyamurty,Prakki Manzi,Antonio Ocimar Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
author_facet |
Santos,Carlos Antonio Costa dos Silva,Bernardo Barbosa da Rao,Tantravahi Venkata Ramana Satyamurty,Prakki Manzi,Antonio Ocimar |
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Santos,Carlos Antonio Costa dos |
title |
Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
title_short |
Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
title_full |
Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
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Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
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Downward longwave radiation estimates for clear-sky conditions over northeast Brazil |
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downward longwave radiation estimates for clear-sky conditions over northeast brazil |
description |
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. |
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Sociedade Brasileira de Meteorologia |
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2011 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862011000300010 |
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1756400311051747328 |